Abstract
Transition metal oxides/nitrides are among the most intriguing materials for electrochemical energy conversion whilst they are inexpensive, resistant to corrosion, and environmentally innocuous. In this regard, we report a hybrid network of Vanadium nitride entangled with the mixed phase of Cu2O/CuO producing nanoneedles to regulate overpotential and electrocatalytic performance of oxygen evolution reaction as a whole. Manifestation of dual metals (Vanadium and Copper) can enhance the electrocatalytic efficacy by diversifying the redox reactions and creating synergistic effects of metal cations. The catalyst fabrication technique presented in the current study allows tuning of the overpotential value, charge transfer resistance, electrochemical active surface area, and tafel slope by varying the plasma power during the sputtering of Vanadium. The obtained catalyst (Cu2O/CuO-VN @ 200 W) exhibits excellent electrocatalytic properties with a low overpotential of 190 mV at 10 mA/cm2 and decreased tafel slope of 135 mv/decade in an alkaline medium. In addition, a remarkable electrochemical active surface area of 954 cm2, mass activity of 9.30 A/g, and high turnover frequency of 0.032 s−1 imply enriched and substantial exposure of abundant active sites. Moreover, radically reduced charge transfer resistance accelerated the rate of the water-splitting reaction.
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