One-step synthesis of 2D vertically-aligned hybrid CuSe@NiSe nanosheets for high performance flexible supercapacitors

An in-situ one-step hydrothermal method is used to prepare hybrid [email protected] nanosheets with vertical orientation and interpenetrating structure on the surface of copper foam ([email protected]). The [email protected] has excellent electrochemical performance and outstanding cycling performance. The specific capacitance of the [email protected] is 1478 F g-1 at a current density of 1 A g-1 and stabilizes at 990 F g-1 at 8 A g-1. The specific capacitance retention of [email protected] is 81.7% after 10,000 cycles. The all-solid-state flexible capacitors prepared with [email protected] as electrode ([email protected]) also exhibit excellent flexibility, superior electrochemical performance and cycle stability. Its capacitance reaches 333 F g-1 at a current density of 1 A g-1. Capacitance retention of 79.3% has been obtained after 10,000 charge-discharge cycles at 2 A g-1.