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The sluggish electrochemical oxygen evolution reaction (OER) is a crucial process for clean energy conversion technology. The preparation of non-precious electrocatalysts with high performance for OER is still a main challenge. Herein, we report a FeNi3 nanoparticles incorporated on N-doped hollow carbon rod with extraordinary performance toward OER by in situ annealing the Ni-doped Fe based metal–organic frameworks (MOFs) precursors. Meanwhile, the pristine N atoms of MOFs doped into carbon frameworks can enhance the electrical conductivity, boost electron mass transport and electron transfer, and construct more active sites. Furthermore, constructing the Fe–Ni alloy structure can facilitate the formation of O–O bond, optimize the free energy for intermediate adsorption and improve OER performance. The as-prepared Fe–Ni bimetal decorated hollow N-doped nanocarbon hybrid structure possesses superior OER performance, which is surpass commercial IrO2 at a overpotential of only 340 mV to achieve the current density of 10 mA cm−2, as well as a small Tafel slope of 86.67 mV dec−1 in alkaline electrolyte. The Fe–Ni alloy/hollow N-doped nanocarbon hybrid structure shining the bright future for obtaining earth-abundant and superior efficient anode OER electrocatalyst.

To develop special structure nanomaterials from nature with large specific surface areas and conduct appropriate doping may be effective ways to improve the performance of carbon-basing energy storage devices and mobile power supplies. Pure Gram-positive bacteria carbon material with dense microporous structure and properly self O, N-doping was developed towards highly performance supercapacitors for the first time. The structural characterization and electrochemial survey show that carbon derived from Gram-positive bacteria can bring unexpected material properties for its layered and nitrogen, oxygen containing peptidoglycan cell wall structure. Specifically, bifidobacterium yogurt starter powder as a representative of Gram-positive bacteria was employed and pre-carbonized at 450 °C, then re-carbonized at 700, 800 and 900 °C with KOH activated, respectively. The as-prepared Gram-positive bacteria carbons (GpBCs) have inherited the bacteria's cell wall structure to some extent, which makes the specific surface area as high as 2877 m2/g. When the mess ratio of the precursor to KOH was 1: 2 and re-carbonized at 800 °C, the sample named GpBC-800-2 exhibited a medium specific surface area (2436 m2/g), and possessed proper oxygen(11.20%) and nitrogen(0.56%) doping. For further electrochemial measurement, GpBC-800-2 delivered a specific capacitance of 220 F/g and a 94.5% retention after 10000 cycles in 6 M KOH at the current density of 1 A/g in three-electrode system. For further assessment on symmetry devices, 30 F/g specific capacitance was obtained and 97.8% retention after 10000 cycles were achieved in 6 M KOH at the current density of 1 A/g for symmetry devices. The constructed devices presented an energy density of 4.2 Wh/kg at the power density of 0.5 kW/kg, and still remained 3.19 Wh/kg at the power density of 5 kW/kg. Results of this work have given a first glance for pure Garm-positive bacteria carbon materials in supercapacitor application.

Nickel-based phosphide hollow nanotubes were constructed using a template strategy. The introduction of PANI may lead to the formation of C–Ni bonds or C–Ni–P bonds at the electrode interface, which induces electron transfer and improves the electrochemical capacity.

Building Z-scheme heterojunction systems is a high-efficiency pathway to improve the utilization of visible light.

N-doped carbon nanowires encapsulated with cobalt nanoparticles are designed and fabricated through solvothermal and pyrolysis procedures by using cobalt chloride and nitrilotriacetic acid as the precursors. The catalyst (C-NTACo-500) demonstrated great potential as highly active bifunctional catalyst for oxygen reduction and oxygen evolution reactions (ORR and OER), with a half wave potential (E1/2) of 0.84 V (vs. RHE) for ORR, and a small overpotential of 0.28 V for OER. Notably, it could provide zinc air batteries (ZAB) a maximum power density of 203.4 mW cm−2, and a high specific capacity of 822.4 mAh gZn−1, as well as excellent charge–discharge stability.

Through a simple two-step solvothermal method, MgCo2O4@MMoO4 (M = Co, Ni) nanosheet arrays were grown on nickel foam. In a 1 M KOH aqueous solution, the two battery-type electrode materials showed ...

Hierarchical copper cobalt sulfide nanobelt array structures with well-defined morphology control are first reported as high energy density electrode materials for asymmetric supercapacitors using a simple two-step solvothermal method. Through appropriate control of the reaction time and sulfide ion concentration during the sulfidation reactions, saturated sulfidation was achieved while ensuring the morphology, structural integrity, and stability of the precursor. Subsequently, the unique morphological structure of the CuCo2S4 nanobelt arrays resulted in high availability and excellent conductivity of the electrochemically active sites. The CuCo2S4 electrode achieved a high specific capacity reaching 1014 C g−1 at 1 A g−1, and 1.95 C cm−2 at 1 mA cm−2 as well as excellent cycling stability of 93.82% after 5000 cycles at 20 mA cm−2, superior to previous values for ternary transition metal sulfides. In addition, a stable output voltage with a 1.6 V aqueous asymmetric device was assembled using prepared mesoporous nitrogen-doped double-layer hollow carbon microspheres as the negative electrode and CuCo2S4 as the positive electrode. The assembled device exhibited a high energy density of 40.2 W h kg−1 at a power density of 799.1 W kg−1 with a high capacity retention (90.89% after 5000 cycles at 20 mA cm−2). More importantly, two devices in series could light up three red LEDs for more than 20 min and rotate a small motor for 15 s. Thus, the results of this study provide a strategy for the design and manufacture of other ternary metal sulfides for high-performance energy storage devices.

Herein, a series of supramolecular self-assembled perylene diimide (PDI) nanomaterials by different solvents have been successfully prepared. Under visible-light irradiation, the self-assembled PDI supramolecular material pretreated by acetone (PDI (acetone)) exhibited superior photocatalytic degradation activity on bisphenol A (BPA) and Rhodamine B (RhB), which were 7.1 times and 4.2 times that of the monomeric PDI, respectively. The improved photo-degradation activity was mainly attributed to the rapid separation and transfer of the photogenerated carriers and π–π interaction between self-assembled PDI supramolecules. The analysis of free radical trapping experiments and ESR characterization together indicated that h+ and ˙O2− are the main active species to rapidly degrade pollutants. Meanwhile, this work also studied the influence of other solvents (e.g., deionized water, methanol, and ethanol) on the self-assembly process of monomeric PDI. In summary, this study provides a new strategy to develop highly efficient self-assembled PDI photocatalysts by different solvents.

Li metal is a promising anode material for next-generation energy storage systems owing to its high theoretical capacity and low potential. However, uncontrollable Li dendrite growth during Li plating and stripping results in low coulombic efficiencies and severe safety hazards. Herein, succinic anhydride (SA), an inexpensive and simple molecule, is investigated as a deposition-regulating additive. The relationship between the Li electrodeposition overpotential and the solvation structure of Li ions was systematically analyzed. Electrochemical tests and theoretical calculations indicate that strong complexation between Li+ and SA changes the solvation structure of Li+ and increases the energy barrier for Li deposition, resulting in a higher overpotential for Li electrodeposition. This increase in overpotential is conducive to generating more nucleation sites, reducing the Li nucleus size, and forming smooth Li deposits. XPS results also show that the addition of SA facilitates the formation of an improved SEI structure. Therefore, symmetric Li/Li cells with 3.0 wt% SA in the electrolyte exhibit excellent electrochemical performance over 300 cycles at 1.0 mA cm−2 with a capacity of 0.5 mA h cm−2. Enhanced cycling performance is also observed in Li/LiNi0.8Co0.1Mn0.1O2 full cells. Thus, SA can significantly alter the Li plating behavior, affording a promising strategy for suppressing Li dendrite growth in Li-metal-based batteries.

Lithium (Li) dendrite growth seriously hinders the practical application of Li metal batteries. Here, we report molecular amidinothiourea (ATU) as a new electrolyte additive to regulate Li stripping/plating behaviors of Li metal anodes. The molecular ATU in the electrolyte can act as a shielding layer on the Li metal surface to suppress the decomposition of electrolytes as verified by XPS and adsorption energy calculation, which improves the electrochemical reversibility of the Li plating/stripping behaviors and inhibits lithium dendrite growth.

Adsorption and its influence are often neglected during photocatalytic degradation of organic pollutants. To call attention to these issues, a novel bismuth oxybromide (BiOBr) microsphere with hierarchical flower-like structure was fabricated through a facile hydrothermal process using polyvinyl pyrrolidone (PVP) as additive in this work, and then the adsorption of the BiOBr microspheres to RhB and its influence on the photocatalytic degradation of RhB were investigated in detail. Experimental results show that the BiOBr microspheres have a very strong adsorption capacity to RhB. The adsorption behavior follows the Langmuir model and the quasi second order kinetic equation. Tests of the photocatalytic degradation of RhB under visible irradiation verify that the adsorption of the BiOBr microspheres to RhB greatly boosts the degradation of RhB due to the "enriching effect", and a complete degradation of 20 mg L

Green and clean energy technologies, including fuel cells, metal-air batteries, water splitting et al., are becoming more significant for our lives. Oxygen reduction reaction (ORR), hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are key reaction processes for fuel cells, metal-air batteries and water splitting. Therefore, it is highly desirable to design a multifunctional catalyst, which owns catalytic performance under a widely applied range. Herein, we demonstrate a novel multifunctional catalyst (Co/Co3O4@C) by carbonizing a composite material constructed of zeolite imidazolate framework and carbon fiber paper (ZIF-L-Co@CP). It is a carbon-based material containing metallic Co and Co3O4 as a low-cost and effective catalyst toward the ORR and overall water splitting. For ORR, the Co/Co3O4@C catalyst shows high half-wave potential in both alkaline and acidic media, 0.823 V for 0.1 M KOH and 0.672 V for 0.1 M HClO4. More importantly, it exhibits good catalytic activities of hydrogen and oxygen evolutions to perform overall splitting in actual seawater.

The reverse water gas shift reaction is a promising approach to solve the problem of excessive CO2 emission and energy shortage. However, insufficient charge separation efficiency of numerous semiconductor photocatalysts hamper their CO2 photoreduction performance. Defect engineering is considered as a desired method to tackle that shortcoming by the boosting the electron capture process. Herein, the sulfur vacancies-rich CdIn2S4 (VS-CdIn2S4) was synthesized by an efficient low-temperature plasma-enhanced technology. The outstanding VS-CdIn2S4 shows a more excellent CO formation rate of 103.6 μmol g−1 h−1 comparing that of traditional CdIn2S4 (31.36 μmol g−1 h−1). The density function theory (DFT) calculation reveals the sulfur vacancy is the center of electron capture. Moreover, the formed defect level after introduce of surface vacancy effectively optimizes the light absorption propertie of the prepared material. Thus, the enhanced photocatalytic CO2 reduction performance can be attributed to the double improvement of light absorption and carrier separation. This work provides a novel and facile strategy to mediate carriers’ movement behavior via defect engineering for high-efficient CO2 photoreduction.

Black phosphorus (BP), an interesting and multi-functional non-metal material, has attracted widespread attention. In this work, 2D BP/2D g-C3N4 heterostructure had been fabricated at extremely low temperature, which was used to reduce CO2 for the first time. With introduction of 2D BP, the separation of photogenerated holes and electrons was extremely boosted, and composites showed excellent photocatalytic performance (CO2 to CO). Meanwhile, the targeted composite could keep high selectivity for CO generation and CO generation rate can be up to 187.7 μmol g−1 h−1. The formation process of the unique heterostructure and the key factor affecting the photocatalytic performance were also discussed. This work provides a new approach for designing metal free photocatalyst, which is used for CO2 reduction.

Developing highly active and low cost catalysts for oxygen reduction is crucial for the commercialization of advanced energy systems. In this work, a mesoporous carbon was fabricated through a simple pyrolysis procedure by using 4′4-bipyridyl, FeCl3 and SBA-15 as the precursors and templates, respectively. The catalyst exhibits rather high ORR performance, with a half-wave potential of 0.906 V (vs. RHE). The catalyst also demonstrates outstanding stability, excellent methanol tolerance and high selectivity towards the four-electron path. The air electrode fabricated by using the catalyst can enable a zinc–air battery to deliver a specific capacity of 815.6 mA h gZn−1 and a maximum power density of 196.3 mW cm−2, which are among the highest values recently reported, to our knowledge. By comparing the catalysts obtained at different temperatures, we found that the increased graphitic N content together with the higher surface area should be the reasonable origins of the outstanding performance.

Oxygen vacancies on photocatalyst surfaces have a significant effect on the improvement of photocatalytic CO2 reduction performance. Plasma treatment can quickly and efficiently introduce oxygen vacancies on catalyst surfaces. In this work, we used plasma to treat Bi2WO6 ultrathin nanosheets to create more surface oxygen vacancies. Increasing oxygen vacancies on the surface of Bi2WO6 not only increases the catalyst's ability to absorb light, but also greatly promotes the separation of photogenerated electrons and holes. In addition, increasing the catalyst specific surface area provides more reaction sites due to plasma etching. In photocatalytic CO2 reduction, Bi2WO6 ultrathin nanosheets with more oxygen vacancies showed excellent activity, and the CO production rate was 40.6 μmol g−1 h−1. Our research provides a simple and fast pathway to improve the CO2 reduction performance of photocatalysts.

Based on the typical Sillen-structured bimetallic oxyhalide layered structure, the introduction of the crystal structure of a high entropy semiconductor photocatalyst allowed the formation of a novel Sillen-structured multimetal high entropy oxyhalide materials with metal cooperativity. A Sillen-structured multimetal high entropy oxyhalide PbxCd1-xBiO2Br material was designed, possessing both ultrathin layered structure of Sillen-structured metal oxyhalides and typical advantages of high stability and more active sites for high entropy alloys. The transfer path of photogenerated electrons is narrowed, and their migration and separation are significantly improved. The catalytic activity was investigated through the photocatalytic degradation of organic pollutants. As verified by ESR and radical trapping experiments, hole (h+) and superoxide radical (·O2-) were proved to be the principal active species during photocatalysis. In this paper, we propose a scheme to combine a high entropy alloy with a Sillen-structured bimetallic oxyhalide and successfully construct a Sillen-structured multimetallic high entropy oxyhalide PbxCd1-xBiO2Br material, which will provide a new direction for the development of Sillen-structured bismuth-based systems.

Here reports a hollow cube NiCo2S4 nanomaterial, which was prepared via facile hydroxylation and sulfuration steps using the self-prepared ZIF-67 as a precursor. This kind of NiCo2S4 as an electrode material for supercapacitor presents a specific capacitance high up to 1350 F g-1 at 1 A g-1 due to the contribution of pseudocapacitance. Particularly, the hybrid supercapacitor PC//NiCo2S4, assembled using the NiCo2S4 as the positive electrode material and the PC as the negative electrode material, delivers a high energy density of 33 Wh kg-1 at the power density of 800 W kg-1. Meanwhile, it presents a good cyclic stability with 67% capacitance retention after 10,000 cycles of charge–discharge at the current density of 5 A g-1. However, the rate capability is not good enough because of the polarization effect of NiCo2S4 as a battery-type electrode material. Therefore, this research provides a reference for enhancing capacitance performance of an electrode material. For instance, reversibility in redox reaction and stability in structure are more important than the capacity in many cases. Preparation of a hollow cube NiCo2S4 and its application in supercapacitor.

The photocatalytic hydrogen evolution reaction is a promising and powerful approach to replace traditional fossil fuels. Herein, we have fabricated Fe, Co dual single atoms dispersed on nitrogen-doped graphene ((Fex, Coy)-NG) by freeze-drying method, which can as a highly efficient co-catalyst. The (Fex, Coy)-NG loaded mesoporous graphitic carbon nitride (mpg-C3N4) exhibits an excellently high performance for photocatalytic hydrogen evolution. The high activity can belong to two ways: (i) the ultrathin mpg-C3N4 not only increases the absorption and active sites but also shortens the charge migration distance; (ii) The nitrogen functional groups from NG can provide abundant coordination sites to evenly bind Fe and Co atoms. The photocatalytic hydrogen evolution performances (Fex, Coy)-NG co-catalyst with different content ratios of Fe atoms and Co atoms were also investigated. The optimized hydrogen production rate (1958 μmol·g-1) of 5 wt % (Fe0.2, Co0.8)-NG/mpg-C3N4 is obviously higher compared to the monometallic counterparts (5 wt % Fe-NG/mpg-C3N4 or 5 wt % Co-NG/mpg-C3N4). The higher photoactivities are due to the synergistic effect between Fe and Co.

Covalent organic frameworks (COFs), have been used as potential photocatalysts for the degradation of antibiotics, but their poor recyclability limits the application in practical environment. In this paper, a novel melamine sponge@COF composite sponge was successfully prepared via a one-pot method by “reactive seeding” strategy. Such strategy enables the uniform and sturdy growth of small-sized COF-TpTt on the melamine sponge (MS) fibers. The composite sponge (MS@TpTt) effectively overcomes the difficulty of recycling for the powder character of general COFs, and shows excellent photocatalytic activity towards the degradation of tetracycline antibiotics under visible light. The finding in this work provides a simple strategy for the preparation of COF-based composite monolithic materials with high degradation performance, easy circulation and high stability for desired catalytic applications.

High porosity nitrogen and phosphorous co-doped carbon nanosheets with high surface area (1057.9 m2 g−1) are fabricated by using polyacrylonitrile and red phosphorous as the precursors. The catalyst exhibits outstanding catalytic performance towards oxygen reduction reaction (ORR), with its half-wave potential 35 mV more superior to that of Pt/C. In addition to high ORR performance, our catalyst also exhibits remarkable methanol tolerance, outstanding stability, as well as high catalytic efficiency (almost 100% selectivity towards four-electron path). Based on the characterization results, we find that moderate P introduction can significantly modify catalysts N compositions, as well as porous structures, which, we suggest, should be the proper origins to our catalyst's outstanding performance.

Molybdenum-based metal oxides have attracted enormous attention because of their high specific capacity, but they still cannot meet current needs. To further enhance the electrochemical performance of the electrodes, we synthesized nanostructured zinc (Zn-)-decorated and cobalt (Co-)-decorated NiMoO4 arrays directly on nickel foams through a simple hydrothermal reaction followed by a calcination procedure. After being decorated with the transition metal cations, the capacities of the hybrid electrodes were marginally superior to the pristine NiMoO4. The optimized Co-decorated NiMoO4 electrode (CNM2) and Zn-decorated electrode (ZNM2) could deliver a high capacity of 1257.3 C g−1 and 969.2 C g−1, respectively, at a current density of 10 mA cm−2. The as-assembled CNM2//activated carbon battery-supercapacitor hybrid device yielded a high capacity of 87.4 F g−1 at a current density of 5 mA cm−2, maximum energy density of 31.1 W h kg−1 at the power density of 1249.9 W kg−1 and excellent stability with capacitance retention of 91.1% after 5000 continuous cycles at a current density of 10 mA cm−2. This work provides an alternative to fabricate other cation decorated transition metal oxide electrodes via a facile synthesis strategy and enable potential applications in the energy storage fields.

Developing highly efficient and low-cost electrocatalysts toward oxygen reduction reaction (ORR) is crucial for novel electrochemical energy conversion systems. In this work, we fabricated an efficient metal-free ORR catalyst with high porosity and surface area (1116 m2 g–1) from a naphthalene-based covalent organic framework. The catalyst exhibits a superior ORR performance to the commercial Pt/C catalyst (with its half-wave potential 30 mV more positive) and outperforms most recently reported metal-free ORR catalysts. In addition to high ORR performance, our catalyst also demonstrates excellent methanol tolerance, outstanding stability, and high catalytic efficiency (nearly 100% four-electron path selectivity). By studying catalysts’ structures and compositions, we found that the sulfur introduction can not only increase the total and ORR active N contents effectively but also grant catalysts much higher surface areas, all of which, we suggest, should be the reasonable origins for our catalyst’s outstan...

The present study successfully synthesized core-shell structured Ni3S2@MnMoO4 nanosheet arrays on Ni foam via a simple two-step hydrothermal method followed by the annealing process. MnMoO4 nanosheets as the shell were grown on the surface of the Ni3S2 nanosheet as the core, and the growth density of the MnMoO4 nanosheets was controlled by changing the hydrothermal time. The optimized Ni3S2@MnMoO4 electrode was able to deliver a specific capacity of 979.3 C g−1 at a current density of 2 mA cm−2 in a 2 M KOH solution and also exhibited an ultrahigh cycling stability of 88.3% capacity retention after 7000 charge-discharge cycles under a current density of 10 mA cm−2. In addition, an asymmetric supercapacitor (ASC) device was fabricated using the optimized electrode as the positive electrode and activated carbon (AC) as the negative electrode, and its electrochemical performance was determined. The device achieved a maximal energy density of 31.4 W h kg−1 at a power density of 399.9 W kg−1 as well as an excellent cycling stability with 91.3% retention of its initial value at a high current density of 20 mA cm−2.

FeIII-substituted phosphorous heteropolytungstate anion PW11O39FeIII(H2O)4− (PW11Fe) is an excellent electrocatalyst for single electron reduction in aqueous medium. How to immobilize it on an electrode is important for practical applications and has been receiving one’s efforts. The paper reports a novel crystal-modified electrode (CME) Bu4NPW11Fe/C, which was prepared by immobilizing the tetrabutylammonium salt of PW11Fe (Bu4NPW11Fe) on the surface of a graphite electrode using a simple hydrothermal process. After characterization by infrared spectroscopy (IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) etc., the electrochemical behavior and electrocatalytic activity towards H2O2 reduction of this CME were studied using the electrochemical methods of cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). It was found that the Bu4NPW11Fe crystals grew on the surface of the graphite electrode in the form of polycrystals such as cube, dodecahedron, and rod shape. The size of the crystalline particles varied from 0.7 to 10.4 μm. The as-prepared CME still retained the electrochemical property of PW11Fe in homogeneous solution. More importantly, it exhibited a better electrocatalytic performance for H2O2 reduction than the modified electrode PW11Fe/CS/C reported previously, prepared by a sol-gel process using chitosan (CS) as an adsorbent. Thus, this research provides a simple and convenient strategy to prepare free-adsorbent and free-crosslinking agent-modified electrodes based on polyoxometalates.

Developing highly efficient and low-cost electrocatalysts for the oxygen reduction reaction (ORR) to substitute precious Pt-based catalysts is highly important for the commercialization of advanced electrochemical energy conversion systems. Doped carbons have attracted wide attention and have become one of the hottest topics in new energy fields due to their high ORR performance and low cost. In this work, uniform nitrogen and sulphur co-doped hollow carbon nanospheres with an ultra-high surface area (1060 m2 g−1) were fabricated by using polyacrylonitrile and sulphur as the precursors. The catalyst exhibits outstanding ORR performance, excellent stability, methanol tolerance, as well as high selectivity toward the four-electron catalytic pathway. By analyzing the effects of sulphur addition, we found that the sulphur addition is crucial for the formation of uniform nanospherical morphologies, as well as highly porous structures and high surface areas. Besides, sulphur addition was also found to be able to modify the catalysts' atomic compositions effectively by increasing the total and pyridinic N contents while reducing oxidized N contents. Sulphur addition induced unique features in the catalysts' structures and compositions. We believe that this should be the main origins of our catalyst's outstanding ORR performance.

Tb3+ doped BiVO4 has been successfully synthesized by a simple microwave-assisted hydrothermal method at 140 °C for 30 min. The structure, morphology and optical property of the Tb3+ doped BiVO4 products have been systematically investigated. This study indicates that the incorporation of Tb3+ could induce the conversion of structure from monoclinic to tetragonal for BiVO4. Furthermore, the as-obtained Tb3+ doped BiVO4 samples showed an obvious morphological change: the hollow square rod-like BiVO4 crystal gradually changed to spindle-like crystal. The Tb3+ doped BiVO4 products exhibited extraordinary photocatalytic activity for Methylene Blue (MB) degradation under visible light irradiation. The doped BiVO4 at a molar ratio of 2 at% (Tb and Bi) with a mixture of monoclinic and tetragonal phases showed and prominent photocatalytic degradation rate, which reached 99.9% in 120 min. The results suggest that the differences in the photocatalytic activity of these BiVO4 crystals with different Tb3+ doping concentrations can be attributed to the change of crystalline phases, and the coexistence of the monoclinic/tetragonal phases in BiVO4 products, which improve the efficient charge separation and transportation.

Highly efficient catalysts for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are key to the commercialization of rechargeable zinc-air batteries (ZABs). In this work, a catalyst with uniform nanospherical morphology was prepared from cobalt nitrate, acetylacetone, and hydrazine hydrate. The final catalyst possesses high ORR and OER performances, with a half-wave potential of 0.911 V [vs reversible hydrogen electrode (RHE)] for ORR and a low potential of 1.57 V (vs RHE) at 10 mA cm-2 for OER in 0.1 M KOH solution. Specially, a ZAB based on the catalyst demonstrates an ultrahigh power density of 479.1 mW cm-2, as well as excellent stability, and potential in practical applications.