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Malavekar, D.B.; Lokhande, V.C.; Patil, D.J.; Kale, S.B.; Patil, U.M.; Ji, T.; Lokhande, C.D.
Journal of colloid and interface science, March 2022, 2022-Mar, 2022-03-00, 20220301, Volume: 609Journal Article
Display omitted Development of electrocatalyst using facile way from non-noble metal compounds with high efficiency for effective water electrolysis is highly demanding for production of hydrogen energy. Nickel based electrocatalysts were currently developed for electrochemical water oxidation in alkaline pH. Herein, amorphous nickel tungstate (NiWO4) was synthesized using the facile successive ionic layer adsorption and reaction method. The films were characterized by X-ray diffraction, Raman spectroscopy, Fourier transfer infrared spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy techniques. The electrochemical analysis showed 315 mV of overpotential at 100 mA cm−2 with lowest Tafel slope of 32 mV dec−1 for oxygen evolution reaction (OER) making films of NiWO4 compatible towards electrocatalysis of water in alkaline media. The chronopotentiometry measurements at 100 mA cm−2 over 24 h showed 97% retention of OER activity. The electrochemical active surface area (ECSA) of NW120 film was 25.5 cm−2.
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