(Digital Presentation) In-Situ Growth of Core@Shell Ni@Fe Doped Ni(Oxy)Hydroxide Nanoarrays on Commercial Nickel Mesh to Promote Oxygen Evolution Reaction

Abstract

Oxygen evolution reaction (OER) is a rate-determining step in water electrolysis. Herein, we report a novel one-step oxidation-electrodeposition (OSOE) approach to generate core@shell (CS) Ni@Fe doped Ni(Oxy)Hydroxide nanoarrays based alkaline water electrolysis electrode with an outstanding OER performance that is, an overpotential of 245 mV is obtained reaching 10 mA cm– 2. The corresponding Tafel slope is 36.8 mV dec– 1. Strikingly, it delivers a Ni-based mass activity of 1336 A g– 1 and a high turnover frequency of 0.285 s– 1, over 7-fold higher than state-of-the-art IrO2. Moreover, the electrode can also survive at 500 mA cm–2 for over 500 h without apparent degradation under industrial conditions. The proficient catalysis was driven by the Fe doped Ni(Oxy)Hydroxide shell that serves as the intrinsically active site over an equally important electrically conductive metallic Ni core array. This is the first report by using OSOE to construct high performance practical catalytic electrode for alkaline water electrolysis.