Facilely synthesis of 3D CuxO–Cu nanostructures as binder-free electrode for supercapacitors

Abstract

3D CuxO–Cu nanostructures were synthesized through a simple chemical corrosion method and were employed as binder-free electrodes for supercapacitors. Owing to the direct growth of the active materials onto the Cu foam without any binders, and the 3D interconnected structure ensures a highly conductive network favorable for electron transfer, the as-prepared electrode exhibit a high specific capacitance of 111mFcm−2 at 0.5mAcm−2 and a better rate capability of 80mFcm−2 at 10mAcm−2. Besides, the CuxO–Cu//AC asymmetric supercapacitor can deliver a high energy density of 34.36μWhcm−2, thus showing great potential for supercapacitor applications.