One-step synthesis of CuO@brass foil by dealloying method for low-cost flexible supercapacitor electrodes.

Qin, Chunling; Zhang, Yanshan; Wang, Zhifeng; Xiong, Hanqing; Yu, Hui; Zhao, Weimin

Dealloying, a famous ancient etching technique, has recently been revealed to produce transition metal oxides as well as nanoporous metals. In this paper, CuO, as a kind of transition metal oxides and a promising supercapacitor electrode material, is fabricated by a one-step dealloying method followed by spontaneous oxidation. It is found that CuO nanoplates/brass foil electrode materials with unique nanostructure and good flexibility are synthesized by dealloying a brass foil in oxygen-rich 10 % HNO solution at 40 °C for 20 min. The electrode exhibits excellent specific capacitance value of 308.6 mF cm (934.2 F g) at 2 mA cm and good cycling stability after 5000 cycles with the capacitance retention of 87.8 %. The binder-free CuO@brass foil electrode, with high electrochemical performance and cost effectiveness, is highly promising as a flexible electrode material in supercapacitors.

CHEMICAL synthesis; COPPER oxide; SUPERCAPACITORS; ELECTRODES; TRANSITION metal oxides; NANOPOROUS materials

Journal of Materials Science: Materials in Electronics, 2016, Vol 27, Issue 9, p9206

0957-4522

Academic Journal

10.1007/s10854-016-4958-7