Enchanced supercapacitor performance of CuxO deposited on activated carbon cloth
The supercapacitive performance of CuxO deposited on activated carbon cloth (ACC) is reported. First, Cu was electrochemically deposited on ACC, followed by thermal oxidation at different temperatures. Results of Raman spectroscopy revealed the formation of mixed Cu2O-CuO at both 100 and 150 oC, and a pure CuO phase at 200 oC. Electrochemical measurements demonstrated that the hybridization of CuxO and ACC results in a combination of electric double layer capacitance and pseudocapacitance. Furthermore, the increase in areal capacitance (CA) as scan rate decreased suggests that the charge storage mechanism of the samples is a diffusion-limited process. A highest CA of 40 mF cm-2 was obtained from the Cu2O-CuO mixed phase sample at a relatively high scan rate of 25 mV s-1 in 1.0 M Na2SO4.