Bifunctional electrocatalysts derived from earth-abundant transition metals are a promising substitute for noble metals in general water electrolysis, but their low activity and short durability limit their application. Herein, a nickel molybdate nanoparticles decorated on nickel foam (NiMoO/NF NPs) electrode was fabricated by a facile hydrothermal method at three different time intervals (6, 12, and 24 h) and verified for the oxygen evolution reaction (OER). The constructed electrodes exhibited high OER activity in 1.0 M KOH with overpotentials of 315 mV, 290 mV and 320 mV for NiMoO-6 h, NiMoO-12 h, and NiMoO-24 h, respectively. In addition, the NiMoO-12 h electrodes displayed remarkable durability with a negligible reduction of 1.28 % at a current density of 10 mA cm for 200 h. This research work delivers a new pathway to improve the electrocatalytic behaviour of the catalysts by synergistically moderating the inherent electrical conductivity, efficient surface moieties, and surface reaction.

中文翻译：

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用于高效析氧反应的纳米结构 NiMoO4 电极材料

源自地球丰富的过渡金属的双功能电催化剂是一般水电解中贵金属的有前景的替代品，但其活性低和耐久性短限制了其应用。在此，通过简便的水热法在三个不同的时间间隔（6、12和24小时）制备了装饰在泡沫镍（NiMoO/NF NPs）电极上的钼酸镍纳米颗粒，并验证了析氧反应（OER）。构建的电极在 1.0 M KOH 中表现出高 OER 活性，NiMoO-6 h、NiMoO-12 h 和 NiMoO-24 h 的过电势分别为 315 mV、290 mV 和 320 mV。此外，NiMoO-12 h 电极表现出卓越的耐用性，在 10 mA cm 的电流密度下持续 200 小时，性能下降了 1.28%，可以忽略不计。这项研究工作通过协同调节固有的电导率、高效的表面部分和表面反应，提供了一条改善催化剂电催化行为的新途径。