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It is attractive to develop an effective bifunctional electrocatalyst for full water splitting. In this Letter, we report that a NiWO 4 nanowire array on a Ti mesh (NiWO 4 /TM) is a high-performance and stable water-splitting electrocatalyst at alkaline pH. As a 3D electrocatalyst, such a NiWO 4 /TM attains 20 mA cm –2 under overpotentials of 101 mV for cathodic water reduction and 322 mV for anodic water oxidation. We also demonstrate the use of NiWO 4 /TM to make a two-electrode electrolyzer capable of driving 20 mA cm –2 at a cell voltage of 1.65 V.
Ji et al. (Mon,) studied this question.
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