Highly efficient noble metal-free water oxidation electrocatalysts play a key role in water splitting devices for large-scale hydrogen production. In this communication, we report the surface engineering of a CoMoO₄ nanoplate array on nickel foam (CoMoO₄ NPAs/NF) by CoMoO₄ nanoparticle decoration. The hierarchical structure of the as-formed CoMoO₄ NP@PAs/NF (CoMoO₄ nanoparticle coated nanoplate array on Ni foam) guarantees the exposure of more catalytically active sites with a much larger electrochemically active surface area, leading to improved catalytic activity for the oxygen evolution reaction (OER) in alkaline media. In 1 M KOH, it needs a low overpotential of 317 mV to attain 100 mA cm⁻², 72 mV less than that for CoMoO₄ NPAs/NF. Moreover, this system is also durable with a twice higher turnover frequency (TOF) value of 0.41 s⁻¹ at 400 mV overpotential compared with CoMoO₄ NPAs/NF.

中文翻译：

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分层CoMoO4纳米颗粒修饰的纳米板阵列作为改进碱性氧释放反应的电催化剂

高效的无贵金属水氧化电催化剂在大规模制氢的水分解装置中起着关键作用。在此交流中，我们报告了通过CoMoO ₄纳米颗粒装饰在镍泡沫（CoMoO ₄ NPAs / NF）上进行CoMoO ₄纳米板阵列的表面工程。形成的CoMoO ₄ NP @ PAs / NF（在Ni泡沫上涂覆CoMoO ₄纳米颗粒的纳米板阵列）的层级结构确保了更多具有更大电化学活性表面积的催化活性位点的暴露，从而提高了该催化剂的催化活性。碱性介质中的氧释放反应（OER）。在1 M KOH中，它需要317 mV的低超电势才能达到100 mA cm ^-2，比CoMoO ₄ NPAs / NF低72 mV 。此外，与CoMoO ₄ NPAs / NF相比，该系统在400 mV超电势下具有0.41 s ^-1的两倍高的周转频率（TOF）值，也很耐用。