Facile fabrication of Cu2O/Cu columnar array electrode through dealloying and in situ oxidation for supercapacitor applications

摘要: A Cu2O/Cu columnar array electrode that integrates the active materials and current collector was fabricated through in situ thermal oxidation of chemically dealloyed Cu–Fe film prepared by co-electrodeposition using copper sulfate ferric as raw materials. The effects ratio ion to iron ion; valence temperature on morphology, structure, electrochemical properties were investigated. Results show not only has a large specific surface area but also good conductivity, which can effectively improve utilization material endow with an excellent capacitance performance. electrodes make reversible redox reaction corresponding transformation between Cu2O Cu within potential window from − 1 0.2 V M KOH aqueous solution. areal optimal is found be high 128.6 mF/cm2 at scan rate 5 mV/s, it shows retention 83.8% after being subjected 5000 charge-discharge cycles density 9 mA/cm2, indicating stability.