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Co‐intercalation reactions make graphite a feasible anode in Ca ion batteries, yet the correlation between Ca ion intercalation behaviors and electrolyte structure remains unclear. This study, for the first time, elucidates the pivotal role of anions in modulating the Ca ion solvation structures and their subsequent intercalation into graphite. Specifically, the electrostatic interactions between Ca ion and anions govern the configurations of solvated‐Ca‐ion in dimethylacetamide‐based electrolytes and graphite intercalation compounds. Among the anions considered (BH4−, ClO4−, TFSI− and [B(hfip)4]−), the coordination of four solvent molecules per Ca ion (CN=4) leads to the highest reversible capacities and the fastest reaction kinetics in graphite. Our study illuminates the origins of the distinct Ca ion intercalation behaviors across various anion‐modulated electrolytes, employing a blend of experimental and theoretical approaches. Importantly, the practical viability of graphite anodes in Ca‐ion full cells is confirmed, showing significant promise for advanced energy storage systems. [ABSTRACT FROM AUTHOR]

Co‐intercalation reactions make graphite a feasible anode in Ca ion batteries, yet the correlation between Ca ion intercalation behaviors and electrolyte structure remains unclear. This study, for the first time, elucidates the pivotal role of anions in modulating the Ca ion solvation structures and their subsequent intercalation into graphite. Specifically, the electrostatic interactions between Ca ion and anions govern the configurations of solvated‐Ca‐ion in dimethylacetamide‐based electrolytes and graphite intercalation compounds. Among the anions considered (BH4−, ClO4−, TFSI− and [B(hfip)4]−), the coordination of four solvent molecules per Ca ion (CN=4) leads to the highest reversible capacities and the fastest reaction kinetics in graphite. Our study illuminates the origins of the distinct Ca ion intercalation behaviors across various anion‐modulated electrolytes, employing a blend of experimental and theoretical approaches. Importantly, the practical viability of graphite anodes in Ca‐ion full cells is confirmed, showing significant promise for advanced energy storage systems. [ABSTRACT FROM AUTHOR]

Graphdiyne (GDY), an emerging type of carbon allotropes, possesses fascinating electrical, chemical, and mechanical properties to readily spark energy applications in the realm of Li‐ion and Na‐ion batteries. Nevertheless, rational design of GDY architectures targeting advanced K‐ion storage has rarely been reported to date. Herein, the first example of synthesizing GDY frameworks in a scalable fashion to realize superb potassium storage for high‐performance K‐ion battery (KIB) anodes is showcased. To begin with, first principles calculations provide theoretical guidances for analyzing the intrinsic potassium storage capability of GDY. Meanwhile, the specific capacity is predicted to be as high as 620 mAh g−1, which is considerably augmented as compared with graphite (278 mAh g−1). Experimental tests then reveal that prepared GDY framework indeed harvests excellent electrochemical performance as a KIB anode, achieving high specific capacity (≈505 mAh g−1 at 50 mA g−1), outstanding rate performance (150 mAh g−1 at 5000 mA g−1) and favorable cycling stability (a high capacity retention of over 90% after 2000 cycles at 1000 mA g−1). Furthermore, kinetic analysis reveals that capacitive effect mainly accounts for the K‐ion storage, with operando Raman spectroscopy/ex situ X‐ray photoelectron spectroscopy identifying good electrochemical reversibility of GDY. [ABSTRACT FROM AUTHOR]

• Customizing CoSe 2 @MXene hybrid ink to allow smooth 3D printing. • Revealing structural advances of 3D-printed electrode via theoretical simulation. • Achieving an energy density of 199 Wh kg−1 for 3D-printed potassium-ion hybrid capacitor. Potassium-ion hybrid capacitor (PIHC) has been deemed as an appealing energy storage system thanks to its low cost and reconciled energy/power density. Nevertheless, the rapid capacity deterioration, sluggish anode kinetics and unsatisfied energy output greatly impede its practical implementation. Herein, a fully 3D-printed (3DP) PIHC affording high-energy–density and long-lifetime is conceptually demonstrated based on a 3DP CoSe 2 @Ti 3 C 2 T n MXene anode and a 3DP activated carbon cathode, which can harvest a gravimetric energy density of 199 Wh kg−1 and a 6000-cycled lifespan with a capacity retention of 84.8%. Our 3D-printable CoSe 2 @Ti 3 C 2 T n MXene hybrid ink with desirable rheological property is customized to derive 3DP electrode with facilitated ion diffusion and mass transport, thereby enabling impressive K-ion storage performances. This work would open up a new and facile avenue for the development of stable, safe and credible PIHCs, which could be readily extended to other metal-ion hybrid capacitors. [ABSTRACT FROM AUTHOR]

• Controlled synthesis of FNP carved nanoframes was realized in a scalable manner. • Thus-fabricated FNP held promise in the realm of energy conversion and storage. • Thus-derived FNP nanoframes functioned as efficient bifunctional electrocatalysts for overall water splitting. • All-FNP, potassium-ion-battery-driven self-powering water-splitting system was constructed. Developing high-performance and cost-effective electrode materials to advance the overall water splitting and electrochemical potassium-ion storage has thus far remains appealing yet challenging. Herein, bimetallic Fe-Ni phosphide (FNP) nanoframes harvesting three-dimensional carved frameworks have been fabricated in a scalable and controllable fashion. Thus-derived FNP nanoframes have been demonstrated as efficient bifunctional electrocatalysts for overall water splitting, comparing favorably with the benchmark performance of the IrO 2 /Pt couple. Such excellent water splitting features can be attributed to the enhanced charge transfer, enlarged active surface area, facilitated electrolyte transport and promoted gas release. Density functional theory calculations reveal that the FNP owns the lowest free energy barrier of the rate-determined step for hydrogen evolution in the alkaline media as compared to the mono-metallic Fe 2 P and Ni 2 P species. In addition, as an anode candidate, FNP possesses outstanding potassium ion storage performances, showing high specific capacity (168 mAh g−1 at 50 mA g−1) and long cycle life (83% capacity retention after 700 cycles at 200 mA g−1). As a proof-of-concept demonstration, all-FNP, KIB-based self-powering water-splitting system can further be constructed, opening up exciting opportunities for the real applications of renewable energy on a basis of as-designed multifunctional FNP architectures. [ABSTRACT FROM AUTHOR]

The advancement of K metal anodes has long been hindered by challenges including dendrite proliferation and volume expansion amid electrochemical cycles. Generic interlayer design for extended anodes and its K uptake/release mechanism remain unexplored to date. Herein, a generic alloy‐boosted strategy is reported to devise a ZnX‐loaded (X = S, Se or Te) porous carbon nanofiber (PCNF) membrane as an efficient 3D interphase layer for K metal anodes. Theoretical computations and experimental investigations suggest that representative ZnTe acts as an alloying site, thereby reducing the nucleation energy barrier and optimizing the deposition pattern of K. Such a maneuver enables dendrite‐free plating of K metal within the interface layer, which facilitates the construction of an extended K anode. As a result, the symmetric cell modified with ZnTe@PCNF demonstrates a lifespan of over 3100 h. When coupled with a cathode, the full cell delivers a capacity retention of 94% after 500 cycles at 1.0 A g⁻¹, showing its potential for the development of practically viable K metal batteries. [ABSTRACT FROM AUTHOR]

Owing to the crustal abundance of sodium element, sodium ion batteries (SIBs) are considered a promising complementary to lithium‐ion battery for stationary energy storage applications. The cointercalation chemistry enables the use of cost‐effective graphite as anodes, whereas the low capacity (<130 mAh g−1) and high redox potential (>0.6 V vs. Na/Na+) of graphite significantly limit the energy density of SIBs. Herein, we induce the high‐capacity Na metal into sodiophilic ternary graphite intercalation compounds (t‐GICs) via co‐intercalation and deposition reactions, thereby achieving Na/t‐GIC anodes with high capacities and low working voltage (0.18 V). The new anodes exhibit high coulombic efficiencies of above 99.7 % over 550 cycles and a high‐rate capacity of 588.4 mAh g−1 at 6 C (10 min per charge). When it is paired with Na3V2(PO4)2F3 (NVPF) cathodes, the SIBs demonstrate a high energy density of 259 Wh kg−1both electrodes surpassing that of commercial LiFePO4//graphite batteries. The outstanding anode performance is attributed to the tailored sodiophilicity of graphite through manipulating the ether solvents and the in situ generated space among t‐GIC flakes to stably accommodate Na metal. Our findings for stable Na plating/striping on sodiophilic graphite materials provide an effective approach for developing advanced SIBs. [ABSTRACT FROM AUTHOR]

Owing to the crustal abundance of sodium element, sodium ion batteries (SIBs) are considered a promising complementary to lithium‐ion battery for stationary energy storage applications. The cointercalation chemistry enables the use of cost‐effective graphite as anodes, whereas the low capacity (<130 mAh g−1) and high redox potential (>0.6 V vs. Na/Na+) of graphite significantly limit the energy density of SIBs. Herein, we induce the high‐capacity Na metal into sodiophilic ternary graphite intercalation compounds (t‐GICs) via co‐intercalation and deposition reactions, thereby achieving Na/t‐GIC anodes with high capacities and low working voltage (0.18 V). The new anodes exhibit high coulombic efficiencies of above 99.7 % over 550 cycles and a high‐rate capacity of 588.4 mAh g−1 at 6 C (10 min per charge). When it is paired with Na3V2(PO4)2F3 (NVPF) cathodes, the SIBs demonstrate a high energy density of 259 Wh kg−1both electrodes surpassing that of commercial LiFePO4//graphite batteries. The outstanding anode performance is attributed to the tailored sodiophilicity of graphite through manipulating the ether solvents and the in situ generated space among t‐GIC flakes to stably accommodate Na metal. Our findings for stable Na plating/striping on sodiophilic graphite materials provide an effective approach for developing advanced SIBs. [ABSTRACT FROM AUTHOR]

Calcium‐ion batteries are emerging as a promising alternative to lithium‐ion batteries by offering potential advantages in cost, affordability, and safety. However, the development of high‐performance calcium batteries has been hindered by the lack of high‐capacity cathodes. Here a small molecular organic cathode, 9,10‐phenanthrenequinone (PQ), is reported which leverages the rapid enolization chemistry of multi‐redox centers (C═O) and the flexible intermolecular structure for high performance. The PQ cathode demonstrates an impressive specific capacity of 250 mAh g−1 at 0.2 C for 200 cycles and superior rate capabilities. The robust performance of PQ cathodes is attributed to the mitigation of small molecule electrode dissolution in the weakly solvating ether electrolytes and the promotion of inter‐and intralayer Ca ion diffusion pathways, which synergistically facilitate the retention of high capacities at elevated current rates. When paired with a Ca metal anode, the full cell achieves remarkable capacities of 214 mAh g−1 at 0.2 C, with an average operating voltage of 2.5 V versus Ca/Ca2+, representing the highest performance among CMBs reported to date. The use of organic cathodes in tailored electrolytes with restricted intermediate dissolutions heralds a new era in the development of multivalent metal batteries. [ABSTRACT FROM AUTHOR]

Potassium‐ion hybrid capacitors (KICs) reconciling the advantages of batteries and supercapacitors have stimulated growing attention for practical energy storage because of the high abundance and low cost of potassium sources. Nevertheless, daunting challenge remains for developing high‐performance potassium accommodation materials due to the large radius of potassium ions. Molybdenum diselenide (MoSe2) has recently been recognized as a promising anode material for potassium‐ion batteries, achieving high capacity and favorable cycling stability. However, KICs based on MoSe2 are scarcely demonstrated by far. Herein, a diatomite‐templated synthetic strategy is devised to fabricate nitrogen‐doped MoSe2/graphene (N‐MoSe2/G) composites with favorable pseudocapacitive potassium storage targeting a superior anode material for KICs. Benefiting from the unique biomorphic structure, high electron/K‐ion conductivity, enriched active sites, and the conspicuous pseudocapacitive effect of N‐MoSe2/G, thus‐derived KIC full‐cell manifests high energy/power densities (maximum 119 Wh kg−1/7212 W kg−1), outperforming those of recently reported KIC counterparts. Furthermore, the potassium storage mechanism of N‐MoSe2/G composite is systematically explored with the aid of first‐principles calculations in combination of in situ X‐ray diffraction and ex situ Raman spectroscopy/transmission electron microscopy/X‐ray photoelectron spectroscopy. [ABSTRACT FROM AUTHOR]

Multiple myeloma (MM) is a hematological disease exhibiting aberrant clonal expansion of cancerous plasma cells in the bone marrow. The effects of treatments for MM vary between patients, highlighting the importance of developing prognostic models for informed therapeutic decision-making. Most previous models were constructed at the gene level, ignoring the fact that the dysfunction of the pathway is closely associated with disease development and progression. The present study considered two strategies that construct predictive models by taking pathway information into consideration: pathway score method and group lasso using pathway information. The former simply converted gene expression to sample-wise pathway scores for model fitting. We considered three methods for pathway score calculation (ssGSEA, GSVA, and z-scores) and 14 data sources providing pathway information. We implemented these methods in microarray data for MM (GSE136324) and obtained a candidate model with the best prediction performance in interval validation. The candidate model is further compared with the gene-based model and previously published models in two external data. We also investigated the effects of missing values on prediction. The results showed that group lasso incorporating Vax pathway information (Vax(grp)) was more competitive in prediction than the gene model in both internal and external validation. Immune information, including VAX pathways, seemed to be more predictive for MM. Vax(grp) also outperformed the previously published models. Moreover, the new model was more resistant to missing values, and the presence of missing values (<5%) would not evidently deteriorate its prediction accuracy using our missing data imputation method. In a nutshell, pathway-based models (using group lasso) were competitive alternatives to gene-based models for MM. These models were documented in an R package (https://github.com/ShuoStat/MMMs), where a missing data imputation method was also integrated to facilitate future validation. Author summary: Traditionally, prognostic models were mainly constructed at the gene level, ignoring the role of pathway functions in disease development and progression. Enlightened by this, we advocated guiding the model building with well-established prior knowledge (pathway information). We investigated several approaches that could incorporate pathway information in model building. The results showed that pathway-based models exhibit superior predictive capabilities compared to their gene-based counterparts. Furthermore, these pathway-based models were more robust to missing values. The proposed models also outperformed previously published gene-based models. Beyond their prediction performance, the pathway-based models can directly reveal the association between the pathway functions and survival outcomes, demonstrating their advantage in the model interpretability. This enhanced interpretability not only deepens our understanding of disease mechanisms but also facilitates informed decision-making in clinical and research settings. We urge for more attention to be given to developing modeling methods that incorporate prior knowledge. [ABSTRACT FROM AUTHOR]

Transition metal nitrides have stimulated a growing research and technological interests due to their fascinating properties, holding great promise for wearable energy storages, portable electronics, and many other applications. However, tailorable and efficient production of metallic nitrides in a cost‐effective manner has remained a daunting challenge by far. Here a biotemplate‐assisted strategy is reported with generality and scalability that employs the natural‐abundant diatomites as growth templates and is applicable to producing various transition metal nitrides, including but not limited to, VN, Mo2N, and WN. The conformal growth of nitride materials would inherit the morphological features of the diatomite template, thereby, endowing the obtained architectures with versatile pore structures and abundant edge defects. Thus‐derived metal nitrides with favorable electrical conductivity and solution‐processible feature have significant implications for flexible printed circuits and electronics. The excellent pseudocapacitive properties of metal nitrides further lead to the construction of flexible, symmetric quasi‐solid‐state supercapacitor devices with stable performance under mechanical deformation (achieving an energy density of 15.5 Wh kg−1 at a power density of 1147.3 W kg−1). The demonstration of such biotemplated synthesis would offer an efficient solution to expand the family of emerging nitride materials with attractive properties for next‐generation wearable applications. A biotemplate‐assisted strategy with generality and scalability is devised by employing natural‐abundant diatomites as growth templates to synthesize various transition metal nitrides. Thus‐derived architectures have significant implications for flexible printed circuits and quasi‐solid‐state supercapacitor devices, paves a new route toward the production of functional metallic nitrides to benefit in‐practical wearable applications. [ABSTRACT FROM AUTHOR]

The utilization of high‐voltage intercalation cathodes in calcium‐ion batteries (CIBs) is impeded by the substantial size and divalent character of Ca2+ ions, which result in pronounced volume alterations and sluggish ion mobility, consequently causing inferior reversibility and low energy/power densities. To tackle these issues, polyanionic K‐vacant KxVPO4F (x∼0, designated as K0VPF) is proposed as high‐voltage and ultra‐stable cathode material in CIBs. The K0VPF demonstrates a decent calcium storage capacity of 75 mAh g−1 at 10 mA g−1 and remarkable capacity retention of 84.2% over 1000 cycles. The average working voltage of the K0VPF is 3.85 V versus Ca2+/Ca, representing the highest value reported for CIB cathodes to date. The combined experimental and theoretical investigations revealed that the low volume changes and hopping diffusion barriers contribute to the extraordinary stability and high‐power capabilities, respectively, of K0VPF. The distribution of Ca ions into polyanionic frameworks with pronounced spatial separation effectively attenuates the Ca2+–Ca2+ repulsive force and thus augmenting the Ca migration kinetics. The high voltage of K0VPF is attributed to the inductive effect from the largely electronegative fluorine. In conjunction with a calcium metal anode and a compatible electrolyte, Ca metal full cells featured a record‐high energy density of ≈300 Wh kg−1. [ABSTRACT FROM AUTHOR]

The heteroatom co‐doped carbonaceous anodes have readily attracted great attention in potassium‐ion batteries (PIBs), owing to their augmented carbon interlayer distances and increased K+ storage sites to induce enhanced capacity value. Nevertheless, the synergistic effect of dual‐doped heteroatoms is still unclear and lacks systematic explorations. In addition, traditional synthetic routes are cumbersome with template removal step, which are normally deficient in product scalability. Herein, a generic protic‐salt strategy is devised to realize sulfur‐, phosphorus‐ or boron‐nitrogen dual‐doped carbon (SNC, PNC, or BNC) via varying the types of protic precursors (e.g., the acid). Throughout comprehensive instrumental probing and theoretical simulation, it is identified that the presence of B–N moiety can harvest high adsorption capability of K+ and hence exhibit more obvious pseudo‐capacitance behavior than bare N‐doped carbon counterpart. As a PIB anode, the BNC electrode displays an impressive reversible capacity (360.5 mAh g−1 at 0.1 A g−1) and cycle stability (125.4 mAh g−1 at 1 A g−1 after 3000 cycles). In situ/ex situ characterizations further reveal the origin of the excellent electrochemical properties of the BNC electrode. Such a tailorable protic‐salt derived anode material offers new possibilities to advance PIB devices. [ABSTRACT FROM AUTHOR]

Sodium (Na) metal batteries are nowadays appealing due to high specific capacity and low cost. However, major caveats including severe Na dendrite growth, unstable solid electrolyte interphase formation, and poor mechanical robustness have hampered its practicability. In this report, a highly sodiophilic and conductive host harnessing hierarchical vertical graphene (VG) cultivator and Co nanoparticle/N‐doped carbon decorator (Co‐VG/CC) is designed to accommodate Na metal throughout a facile infusion route. The strong interaction between Co‐VG/CC and Na is realized by sodiophilic Co nanoparticle/N‐doped carbon hybrid, resulting in excellent structural stability of the electrode. The well‐regulated Na adsorption behavior and uniform stripping/plating mechanism is systematically investigated via theoretical simulation in harmonization with in situ/ex situ electroanalytical analysis. In consequence, as‐derived Na@Co‐VG/CC electrode effectively inhibits the dendrite formation, resulting in promising electrochemical performances in symmetric cell configuration (functioning at an elevated rate of 5.0 mA cm−2 under 5.0 mAh cm−2 for 280 h, delivering a high capacity of 6.0 mAh cm−2 at 3.0 mA cm−2 for 1000 h and maintaining an ultralong lifespan up to 2000 h). Meanwhile, assembled flexible Na metal battery full cell can sustain to work for 120 h, representing a great advance in practical energy storage applications. [ABSTRACT FROM AUTHOR]

Carbonaceous materials have emerged as promising anode candidates for potassium‐ion batteries (PIBs) due to overwhelming advantages including cost‐effectiveness and wide availability of materials. However, further development in this realm is handicapped by the deficiency in their in‐target and large‐scale synthesis, as well as their low specific capacity and huge volume expansion. Herein the precise and scalable synthesis of N/S dual‐doped graphitic hollow architectures (NSG) via direct plasma enhanced chemical vapor deposition is reported. Thus‐fabricated NSG affording uniform nitrogen/sulfur co‐doping, possesses ample potassiophilic surface moieties, effective electron/ion‐transport pathways, and high structural stability, which bestow it with high rate capability (≈100 mAh g−1 at 20 A g−1) and a prolonged cycle life (a capacity retention rate of 90.2% at 5 A g−1 after 5000 cycles), important steps toward high‐performance K‐ion storage. The enhanced kinetics of the NSG anode are systematically probed by theoretical simulations combined with operando Raman spectroscopy, ex situ X‐ray photoelectron spectroscopy, and galvanostatic intermittent titration technique measurements. In further contexts, printed NSG electrodes with tunable mass loading (1.84, 3.64, and 5.65 mg cm−2) are realized to showcase high areal capacities. This study demonstrates the construction of a printable carbon‐based PIB anode, that holds great promise for next‐generation grid‐scale PIB applications. [ABSTRACT FROM AUTHOR]

In the article "KxVPO4F (x∼0): A New High‐Voltage and Low‐Strain Cathode Material for Ultrastable Calcium Rechargeable Batteries," Zheng‐Long Xu and his team introduce a polyanionic K‐vacant KxVPO4F (x∼0) as a cathode material for rechargeable calcium batteries. This material demonstrates high voltage and stability, setting a standard for high-energy calcium metal batteries and providing a potential solution for other multivalent chemistries facing similar challenges. The study is authored by Renjie Li, Youngsu Lee, Huijun Lin, Xiangli Che, Xiangjun Pu, Yuyang Yi, Feiyang Chen, Jingya Yu, Kang Cheung Chan, Kyu‐Young Park, and Zheng‐Long Xu. [Extracted from the article]

Mycotoxin contaminations in food and environment seriously harms human health. Constructing sensitive and point-of-test early-warning tools for mycotoxin determination is in high demand. In this study, a CuCo@PDA nanozyme-based aptamer-mediated lateral flow assay (Apt-LFA) has been elaborately designed for on-site and sensitive determination of mycotoxin Aflatoxin B1 (AFB1). Benefiting from the rich functional groups and excellent peroxidase-like activity, the CuCo@PDA with original dark color can be conjugated with the specific recognition probe (i.e., aptamer), generating colorimetric signal on the test lines of Apt-LFA via a competitive sensing strategy. The signal can further be amplified in-situ by catalytic chromogenic reaction. Therefore, a visual and dual-readout detection of AFB1 has been realized. The developed Apt-LFA provides a flexible detection mode for qualitative and quantitative analysis of AFB1 by naked-eyes observation or smartphone readout. The smartphone-based LFA platform shows a reliable and ultrasensitive determination of AFB1 with the limit of detection (LOD) of 2.2 pg/mL. The recoveries in the real samples are in the range of 95.11–113.77% with coefficients of variations less than 9.84%. This study provides a new approach to realize point-of-test and sensitive detection of mycotoxins in food and environment using nanozyme-based Apt-LFAs. [Display omitted] • Multifunctional CuCo@PDA showed excellent peroxidase-like activity. • A novel LFA technique was constructed with Apt/CuCo@PDA as the signal probe. • The developed Apt-LFA presented a visual and dual-readout detection strategy. • A portable colorimetric sensing platform was used to on-site analysis of AFB1. [ABSTRACT FROM AUTHOR]

A combined chemical vapor deposition with high-pressure annealing has been developed for the production of phosphorus-doped helical carbon nanofibers (P-HCNFs). The resulting P-HCNFs have a large specific surface area, well-defined three-dimensional hierarchical helical structure and rapid apparent heterogeneous electron transfer. Based on the high electrocatalytic activity, the P-HCNFs were used to develop an amperometric sensor for carbendazim detection. The experimental results demonstrated that the sensor is promising for the determination of carbendazim in food samples due to the high sensitivity, wide linear range and low detection limit. [ABSTRACT FROM AUTHOR]

[Display omitted] • Designing bimetallic heterojunction that comprises Mo-Co telluride moiety. • Revealing structural change of electrode by in situ transmission electron microscopy. • Achieving a lifespan of 6000 cycles at 1.0 A g−1 for K-ion hybrid capacitor. Unitary transition-metal tellurides are appealing to supersede their oxide and sulfide congeners in the realm of K-ion storage because of advanced electrical conductivity. Nevertheless, the marked volume expansion of tellurides during K+ uptake/release giving rise to rapid capacity decay remains a daunting obstacle. Distinct from the previously reported singular telluride configurations, bimetallic heterojunction comprising Mo-Co telluride moiety and dual-carbon encapsulation is developed in this study to endow durable K-ion storage. Density functional theory calculations unlock the synergistic effects of bimetallic Mo-Co tellurides with respect to augmenting electrical conductivity and favoring K-ion adsorption. In situ transmission electron microscopy analysis clearly reveal the structural evolution of bimetallic Mo-Co telluride during a discharge/charge cycle, showing a mitigated volume expansion rate of 2.37 %. Accordingly, the heterojunction exhibits excellent cycling stability (160 mAh/g for 2000 cycles at 1.0 A/g) and favorable capacity output (322 mAh/g at 0.2 A/g), outperforming unitary MoTe 2 or CoTe 2 counterparts. Thus-derived K-ion hybrid capacitor full-cell manifests elongated lifespan over 6000 cycles at 1.0 A/g. This telluride heterojunction material might offer a valuable reference to rendering high-performance potassium-based energy storage devices. [ABSTRACT FROM AUTHOR]

Accurate on-site analysis of food quality, environmental pollutants, and disease biomarkers is of great significance for safeguarding public health. In this work, based on the novel nanozymes, MnCo oxides@carbon yolk-shell nanocages (MnCo@C NCs), a portable colorimetric sensor with smartphone platform has been developed for rapid, on-site and quantitative analysis of total antioxidant capacity (TAC) and phenolic compounds. The MnCo@C NCs are synthesized via one-step calcination of polydopamine-coated MnCo Prussian blue analogs (MnCo-PBA@PDA). The PDA-derived carbon shell is found to be able to protect the nanocages from collapsing, thus increasing their specific surface areas and porosity. Benefiting from the unique structure and multivalent MnCo bimetallic oxides, the MnCo@C NCs perform outstanding catalytic performance and multiple enzyme-mimicking activities including oxidase, laccase and catalase. Hence, a multifunctional application platform integrated smartphone has been constructed for rapid and sensitive colorimetric detection of three model analytes (i.e., ascorbic acid (AA), 2,4-dichlorophenol (2,4-DP), and epinephrine) with extremely low detection limits of 0.29 μM, 0.76 μM, and 0.70 μM, respectively. This sensor device is successfully applied in TAC analysis in vegetables, fruits, and beverages, as well as epinephrine determination in human serum samples. This work provides new insights into designing multifunctional nanozymes to advance the instant detection technology in the field of food supervision, environment monitoring, and human health. [ABSTRACT FROM AUTHOR]

The problems of high salinity and coexistence of antibiotics in mariculture wastewater pose a great challenge to the traditional wastewater treatment technology. Herein, an electrocatalytic system based on cathodes to sustain reactive chlorine species (RCS) in a high chlorine environment was proposed. The results show that the content of RCS is affected by cathodes. The electrocatalytic system with FeNi/NF as cathode has the largest RCS retention capacity when compared with other cathode systems (carbon felt, nickel foam, copper foam, stainless steel, and nickel-iron foam). This is related to FeNi/NF's higher hydrogen production activity, which inhibits the reduction reaction of RCS. Furthermore, the degradation of tetracycline by the proposed FeNi/NF system maintained long-term effective performance across 20 cycles. Thus, the application of high chlorine resistance electrocatalysis system provides a possibility for practical electrocatalysis treatment of mariculture wastewater. [Display omitted] • The FeNi/NF-system showed ultrahigh durability and activity in a NaCl environment. • Abundant RCS preserved in the FeNi/NF-system promotes tetracycline's degradation. • FeNi/NF's higher HER activity inhibits the reduction reaction of RCS. • Weakening RCS's reduction by cathodes can improve the electrocatalytic activity. [ABSTRACT FROM AUTHOR]

Highlights: [•] Pogostone and two novel dimers of Pogostone were prepared simultaneously. [•] Pogostone was first charactered by X-ray diffraction. [•] Two diastereomers were elucidated by 1H and 13C NMR, COSY, HMQC and HMBC together with X-ray diffraction. [•] X-ray results indicated there solely existed H-bond intramolecular interactions in the two compounds. [ABSTRACT FROM AUTHOR]

Iron-cobalt layered double hydroxides (FeCoLDH) showed superior oxygen evolution reaction (OER) performance, but the sluggish water adsorption and dissociation dynamics restrict its capacity to degrade organic pollutants by electro-oxidation. Herein, enhanced electro-oxidation performance of FeCoLDH with hydrophilic structure was designed and exhibited efficient removal efficiency of tetracycline. Theoretical calculation and characterization results consistently elucidated that the electronic structure of FeCoLDH is optimized by doping phosphorus and depositing copper nanodots (NDs). In addition, the obtained Cu NDs/P-FeCoLDH shows higher degradation ability of tetracycline in all-pH conditions than pristine FeCoLDH. That's because it owns smaller barrier with 0.6 eV to generate hydroxyl radicals (•OH) than pristine FeCoLDH. Furthermore, it can effectively degrade organic pollutants in seawater, river water and pharmaceutical wastewater samples. This work provides novel and rational electrode materials for electro-oxidation system with practical application potential, which could offer new insights into the fundamental understanding of electrochemistry. [Display omitted] • Cu NDs/P-FeCoLDHanode exhibits superior degradation efficiency of TC in all-pH conditions • P doping optimizedtheadsorption energies of hydrogen • Cu NDs deposition accelerateddissociation ofwater molecules • Reasonable mechanismfor the enhanced electrooxidation activity was well explained [ABSTRACT FROM AUTHOR]

[Display omitted] • Floating porous g-C 3 N 4 composite (FPCN) was successfully fabricated by a facile one-pot method. • FPCN exhibited a good photocatalytic performance under visible light without any stirring. • FPCN showed a good stability and reusability. • Possible degradation pathway of tetracycline and mechanism of the photocatalytic process were proposed. Powder catalysts are difficult to recycle, which may induce secondary pollution and may limit their practical application. Herein, we successfully synthesized floating porous g-C 3 N 4 (FPCN) using a melamine sponge and urea via a facile one-pot method, which can solve the recycling problem of powder catalysts. The highest elimination efficiency of 5 mg/L tetracycline (TC) reached 70% by 2 g/L FPCN without any stirring under visible light after 4 h. However, the elimination efficiency of 5 mg/L TC by 2 g/L powder g-C 3 N 4 was only 36.9% under the same conditions. The good photocatalytic performance of FPCN is attributed to its 3D interconnected network and enhanced light absorption. The effects of inorganic ions and organic matters on the photocatalytic performance of FPCN were studied. Finally, we proposed a possible mechanism and pathway for degradation of TC. [ABSTRACT FROM AUTHOR]