A Facile Synthesis Of Ni0.85se@Cu2-Xse Nanorods As High-Performance Supercapacitor Electrode Materials

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).