Transition metal oxides are considered to be one of the most potential electrode materials. However, its poor conductivity and insufficient active sites limit its actual applications. Rationally design electrode materials...

Reasonably constructed complex electrode materials are crucial for enhancing the performance of supercapacitors. In this work, polypyrrole (PPy)-modified Ni3S2 nanosheet electrodes are obtained by a hydrothermal approach and a subsequent electrodeposition method. In addition, a composite electrode can shorten the ion diffusion path and enhance its conductivity. The optimal product delivers a capacity of 1484 C g–1 at 1 A g–1 and high cycling stability. In addition, the assembled hybrid supercapacitor achieves an energy density of 74.9 W h kg–1 at 1356.4 W kg–1 and a capacity of 91.7% after 10 000 cycles. Also, the device shows excellent mechanical stability under different bending angles.

Nanostructured Ni 3 S 2 is considered to be one of the most promising energy storage materials due to its high theoretical specific capacitance and excellent conductivity. In this work, we prepare dendritic Ni 3 S 2 nanosheet arrays by one-step solvothermal method. The as-prepared samples as binder-free electrode present a specific capacity of 863.55 C g −1 at 1 A g −1 . The assembled hybrid supercapacitor owns an energy density of 33.7 W h kg −1 at 1396.7 W kg −1 . Such excellent electrochemical performance can be ascribed to its unique structure and the direct contact between Ni 3 S 2 and Ni foam, which can ensure rapid ion and electron transfers during redox reactions.