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Transition-metal selenides are regarded as promising electrode materials due to their superior electrochemical performances for supercapacitors. In this study, a nanorod-like hybrid of Ni0.85Se@Cu2-xSe on a Ni-foam substrate is successfully… Click to show full abstract
Transition-metal selenides are regarded as promising electrode materials due to their superior electrochemical performances for supercapacitors. In this study, a nanorod-like hybrid of Ni0.85Se@Cu2-xSe on a Ni-foam substrate is successfully synthesized via a facile one-step route. The Ni0.85Se@Cu2-xSe nanorods are found to be deposited uniformly on the Ni-form substrates. When used as a battery-type electrode in a supercapacitor, the as-deposited Ni0.85Se@Cu2-xSe electrode exhibits a high specific capacity of 1831 F g-1 at 1 A g-1 and 78.4% of capacitance retention after 8000 cycles at 10 A g-1. Moreover, the assembled Ni0.85Se@Cu2-xSe//AC asymmetric supercapacitor (ASC) exhibits an energy density of 63.2 W h kg-1 at a power density of 800.1 W kg-1, as well as good cycling stability (92.1% capacitance retention after 5000 cycles).