Mesoporous Co-Mo-S nanosheet networks as cathode materials for flexible electrochemical capacitors

Molybdenum-based oxides possess high theoretical capacity and excellent cycling stability. However, the poor conductivity limits their wide applications. A simple vulcanization strategy can be employed to improve their electrochemical activity. In this study, we synthesized many Co-Mo-S nanosheet networks as electrode materials by a two-step hydrothermal strategy. These networks delivered a specific capacity of 510 C g(-1) at 1 A g(-1). An asymmetric supercapacitor was assembled using the as-prepared product as the cathode. It possesses an energy density of 72.25 W h kg(-1) at 2700 W kg(-1). It still retains 83.4% of initial capacity (2 A g(-1)) after 9000 cycles. In addition, the device shows outstanding mechanical stability at different folding angles, demonstrating its promising applications in portable micro/nano storage energy devices.

Automated summary

In this study, various Co-Mo-S nanosheet networks were synthesized as electrode materials, showing high specific capacity and excellent cycling stability; a vulcanization strategy was used to enhance the electrochemical activity of molybdenum-based oxides; an assembled asymmetric supercapacitor exhibited impressive performance in terms of energy density and cyclic stability, with potential applications in portable energy storage devices.