Abstract
The Cu2Sex nanosheet grown on copper foam was synthesized at room temperature (25 °C) with time of as rapid as 5 min in the mixture solution of selenium and hydrazine hydrate. The Cu2Sex can be stably transformed into CuO by cyclic voltammetry (CV) in 0.1 M KOH, whose phase transformation process includes Cu2Sex transforming into Cu2Se and Cu2Se transforming into CuO. The corresponding morphology can be changed from nanosheet to thin hierarchical nanosheet and the electrochemical performance is improved simultaneously. The electrochemical behavior of CuO@Cu electrode was studied systematically, which exhibited a high specific capacitance of 1240 mF/cm2 (168 F/g) at a current density of 1 mA/cm2, and displayed a good stability with capacitance retention of 87.82% after 10000 charge/discharge cycles.
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