Binder free, robust and scalable CuO@GCE modified electrodes for efficient electrochemical water oxidation

Abstract

CuO is generally considered as an efficient energy material for potential applications. Pure and M (Ni, Co, Zn) doped CuO@GCE modified electrodes have been fabricated via cost effective solvothermal route for electrochemical water oxidation process. Full-fledged electrochemical oxidation of water achieved by Co doped CuO@GCE modified electrode exhibited the current density of 4.41 mA/g at 2.1 V vs RHE with lower Tafel slope value of 67 mV/decade. Incorporation of foreign ions in CuO lattice supported to promote the overall charge transportation mechanism of CuO@GCE modified electrode which revealed by decreasing the charge transfer resistance (Rct) arc. Moreover, 100% of retention was achieved for Co co-catalyst incorporated CuO@GCE modified electrode even after 24 h of stability performance. Hence, it can be recommended that optimized synthesis and fabrication techniques assisted optimum co-catalyst preferred CuO@GCE modified electrode is strongly ascribable as an efficient, binder free, robust and scalable electrode for electrochemical water oxidation and various potential applications.