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• High pressure drives the rapid implantation of polyaniline in host [VO n ] lattices. • Bipolar protonation provides abundant active sites for ion/electron mobility. • Interfacial coupling bonds effectively relieve the intercalation stress of V 2 O 5. • Charge storage process with multiple ions was elucidated by in situ FTIR/Raman. • AZIBs exhibits ultrahigh-rate and ultralong-life zinc ions storage performance. Durable cathode materials with high specific capacity are essential for aqueous zinc ion batteries (AZIBs). However, vanadium-based materials endure irreversible structural collapse, sluggish diffusion kinetics, and low working voltage. In this study, we propose a unique pressure-driven molecule implantation (PMI) strategy to fabricate a laminar organic–inorganic hybrid cathode (PMI-VO) for AZIBs by coupling polyaniline (PANI) with vanadium oxide. The bipolar protonation of implanted electroactive PANI provides abundant active sites for ion/electron transfer and Zn2+/H+ storage in PMI-VO. Importantly, the formed C-V-O interfacial coupling bonds in the cycling process effectively relieve the intercalation stress and strengthen the redox kinetics and structural integrity of V 2 O 5. In situ infrared spectroscopy and theoretical calculations reveal the PMI-induced multiple ions storage mechanisms in the PMI-VO cathode. Accordingly, PMI-VO cathode performs a superior specific capacity of 522 mAh∙g−1 at 0.2 A∙g−1, a high operating voltage of 0.86 V, a high energy density (387.4 Wh∙kg−1), and splendid long-life stability (over 15,000 cycles at 20 A∙g−1 with 191 mAh∙g−1). Therefore, this pressure-driven molecule implantation strategy provides a pioneering method to fabricate superior cathode materials of advanced AZIBs. [ABSTRACT FROM AUTHOR]

This work fabricated highly flexible and piezoelectric nanofiber with coaxial and hierarchical architecture, which integrated polydopamine-modified BaTiO 3 nanowires into polymeric P(VDF-TrFE) matrix. The assembled flexible and wearable piezoelectric nanogenerator had excellent sensitivity and stability for self-powered physiological multimodal sensing. [Display omitted] • Development of organic–inorganic coaxial piezoelectric nanogenerator (PENG). • The reinforced interfacial coupling improved the piezoelectric response. • The mechanism of interfacial enhancement was deeply investigated. • High sensitivity (4.3 V N−1) and rapid response time (20.4 ms) were achieved. The relatively low sensitivity of flexible piezoelectric nanogenerators (PENG) is the most urgent problem to be solved for their applications in internet of things and artificial intelligences. To improve the piezoelectricity of polymeric fibers without discount of flexibility, BaTiO 3 nanowire (BTNW) with high aspect ratio is introduced into the piezoelectric P(VDF-TrFE) (denoted as PT) electrospun fibers to form coaxial composite nanofibers for improving the sensitivity towards external mechanical loads. To reinforce the organic–inorganic interfacial interaction for the improvement of the piezoelectric response, a nanolayer of polydopamine (PDA) is uniformly coated on the surface of BTNW (denoted as pBTNW) to form PT/pBTNW nanofibers. The introduction of 7 wt% pBTNW into the fibers significantly improves the polymeric β-phase conformation and mechanical properties, simultaneously, resulting in an optimal piezoelectric output of 18.2 V under an impact force of 5 N with excellent sensitivity of 4.3 V N−1. Through both theoretical simulation and experimental characterization, the PT/pBTNW-based PENG exhibits a higher electrical output than the equivalent nanoparticle-based PENG. The optimized PENG sensor can be used for self-powered and sensitive biomonitoring of physiological movements, finger identification and voice recognition. Overall, this work offers a reliable method for enhancing piezoelectricity of flexible polymeric nanofiber and designing high-performance PENG for wearable fabric-based sensors. [ABSTRACT FROM AUTHOR]

Ultrathin amorphous-crystalline biphasic δ -MnO 2 / ε -Fe 2 O 3 nanosheets have been developed through tandem alkali hydrolysis and hetero-epitaxial growth protocol. The in situ reconstructed interlayer results in the ameliorated interfaces for boosting water oxidation kinetics. A proof-of-concept prototype using Zn-MnO 2 battery as power to drive δ -MnO 2 -based water splitting cell has been demonstrated. [Display omitted] • Ultrathin hetero-nanosheets have been fabricated through facile alkali hydrolysis of coordination polymers. • The hetero-epitaxial growth protocols have been proposed for the formation of hetero-nanosheets. • The hetero-nanosheets possess extraordinary alkaline OER activity and remarkable long-term stability. • The in situ interlayer reconstruction during OER has been disclosed for performance enhancement. Developing high-performance and low-cost oxygen evolution reaction (OER) electrocatalysts is critical for implementing industrial H 2 production. Herein, ultrathin Fe-Mn-O hetero-nanosheets consisting of crystalline ε -Fe 2 O 3 intercalated in amorphous Fe-doped δ -MnO 2 have been fabricated through facile alkali hydrolysis of FeMn-based coordination polymer. Abundant Mn3+ active sites and oxygen vacancies are generated in Fe-doped δ -MnO 2 layer due to in-layer/interlayer reformations, where interstitial ε -Fe 2 O 3 is engineered to reinforce stability and conductivity. The optimal 0.5Fe-Mn-O nanosheets exhibit superb activity with low overpotentials of 258 (322) mV at 10 (300) mA cm−2 for OER together with strong stability under large current density over 100 h, ranking it among the best MnO 2 -based electrocatalysts. Importantly, in situ interlayer reconstruction from ε -Fe 2 O 3 to β -FeOOH during OER has been unveiled, the evolved β -FeOOH triggers strong interfacial electronic coupling, which synergizes with oxygen vacancies and Fe3+ dopants to modulate surface electronic structure of δ -MnO 2 for intermediates adsorption. [ABSTRACT FROM AUTHOR]

Cellulose@Mg(OH) 2 was prepared via a facile method, which has both good shaping ability and high removal capability. The composite can be made into filter to remove heavy metal ion, and the treated water meets the potable water criteria. [Display omitted] • Water treatment agent cellulose@Mg(OH) 2 was prepared via a facile method. • Cellulose guides to form ultrathin Mg(OH) 2 by non Van der Waals interaction. • Easy shaping property of our material makes HMIs' separation practical. • High removal capacity and durability are achieved for HMIs' removal. • Recovered HMIs can be retained on composite fibers and separated from water. The utilization of renewable biomass cellulose in treating pollution of heavy metal ions (HMIs) is one of overarching and appealing strategies, because it simultaneously satisfies sustainable development and resolves ever-increasing environmental issue. In this regard, the composite cellulose@Mg(OH) 2 was prepared via a facile method and explored for its use as water treatment agent. It is demonstrated that the smaller and thinner hexagonal Mg(OH) 2 flakes are constructed onto the cellulose substrate by self-assembling; two components are chemically coupled via hydrogen bonds and Mg-O c (cellulose oxygen) dative bonds; what's more, the coupling of cellulose with Mg(OH) 2 (1 0 1) facet is much more preferential than with (0 0 1) facet. The resultant composite material shows remarkable HMI removal performance: large capacities of 734.9, 595.8 and 1473.1 mg g−1 for Cd2+, Cu2+ and Pb2+, respectively. Further assisted by good shaping property of the cellulose substrate, the composite is capable of being made into filter, which practically separates HMIs and purifies wastewater with high removal efficiency (99.99%) for Cd2+ even after operating for 110 days and potable water can be obtained. The mechanism is delineated with removal models and characterizations of HMI-recovered products. [ABSTRACT FROM AUTHOR]