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The development of an electrochemical energy storage system with exceptional performance is an important way to address the energy crisis and environmental pollution of the modem world. In this study, an NiCo2O4@MnS composite with a unique hierarchical structure has been successfully synthesized on an NF substrate using the hydrothermal–electrodeposition method. The results indicate that NiCo2O4@MnS possesses superior specific capacitance and excellent cycling stability. At a current density of 2 A g−1, its specific capacitance can reach 2100 F g−1, while the capacitance retention is still 76% after 10 000 cycles at 10 A g−1. Moreover, when the current density is 1 A g−1, the assembled NiCo2O4@MnS//AC device can deliver a specific capacitance of 203 F g−1, and the energy density is up to 55 W h kg−1 at a power density of 697 W kg−1. These outstanding electrochemical properties of NiCo2O4@MnS can be ascribed to the increase in ion diffusion, specific surface area and electronic conductivity due to its unique hierarchical structure and introduction of MnS. [ABSTRACT FROM AUTHOR]

A NiB binary catalyst with a unique mulberry-like nanoparticle morphology has been prepared by one-step electrodeposition. The NiB-0.2 catalyst exhibits excellent catalytic activity, selectivity, and stability for the borohydride oxidation reaction. Moreover, a direct borohydride fuel cell using the NiB-0.2 catalyst anode can deliver a peak power density of 453 mW cm−2 and open-circuit voltage of 1.96 V at 343 K. The improved performances are due to the introduction of B. This study may inspire the development of efficient noble-metal-free anode catalysts for DBFCs. [ABSTRACT FROM AUTHOR]

To overcome the disadvantages of poor intrinsic conductivity and stability of ZnCo 2 O 4 , a ZnCo 2 O 4 @MnMoO 4 composite as an emerging pseudocapacitor electrode material with high specific capacitance, environmental friendliness, morphological diversity, and unique hierarchical structure was synthesized via a simple two-step hydrothermal method. The research results indicate that the ZnCo 2 O 4 @MnMoO 4 composite can present a high specific capacity of 1628 F g -1 at a current density of 1 A g -1 and good cycling stability with 69% capacity retention after 10 000 cycles at 10 A g -1 . Hybrid supercapacitors (HSCs) assembled with the ZnCo 2 O 4 @MnMoO 4 cathode and activated carbon anode can deliver an energy density of 48 W h kg -1 at a power density of 695 W kg -1 , and their capacity retention reached 61% after 8000 charge-discharge cycles at a current density of 10 A g -1 . This could be attributed to the synergistic effect of the specific surface area and electrical conductivity enhanced by compositing ZnCo 2 O 4 with MnMoO 4 . As a result, the excellent electrochemical properties show that the ZnCo 2 O 4 @MnMoO 4 composite has strong application potential for high-performance supercapacitors.

The development of an electrochemical energy storage system with exceptional performance is an important way to address the energy crisis and environmental pollution of the modem world. In this study, an NiCo 2 O 4 @MnS composite with a unique hierarchical structure has been successfully synthesized on an NF substrate using the hydrothermal-electrodeposition method. The results indicate that NiCo 2 O 4 @MnS possesses superior specific capacitance and excellent cycling stability. At a current density of 2 A g -1 , its specific capacitance can reach 2100 F g -1 , while the capacitance retention is still 76% after 10 000 cycles at 10 A g -1 . Moreover, when the current density is 1 A g -1 , the assembled NiCo 2 O 4 @MnS//AC device can deliver a specific capacitance of 203 F g -1 , and the energy density is up to 55 W h kg -1 at a power density of 697 W kg -1 . These outstanding electrochemical properties of NiCo 2 O 4 @MnS can be ascribed to the increase in ion diffusion, specific surface area and electronic conductivity due to its unique hierarchical structure and introduction of MnS.