Understanding the reconstruction mechanism to rationally design cost‐effective electrocatalysts for oxygen evolution reaction (OER) is still challenging. Herein, a defect‐rich NiMoO4 precatalyst is used to explore its OER activity and reconstruction mechanism. In situ generated oxygen vacancies, distorted lattices, and edge dislocations expedite the deep reconstruction of NiMoO4 to form polycrystalline Ni (oxy)hydroxides for alkaline oxygen evolution. It only needs ≈230 and ≈285 mV to reach 10 and 100 mA cm−2, respectively. The reconstruction boosted by the redox of Ni is confirmed experimentally by sectionalized cyclic voltammetry activations at different specified potential ranges combined with ex situ characterization techniques. Subsequently, the reconstruction route is presented based on the acid‐base electronic theory. Accordingly, the dominant contribution of the adsorbate evolution mechanism to reconstruction during oxygen evolution is revealed. This work develops a novel route to synthesize defect‐rich materials and provides new tactics to investigate the reconstruction.

中文翻译：

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氧化还原促进富缺陷镍预催化剂的快速深度重构，实现高效水氧化


了解重构机制以合理设计用于析氧反应（OER）的具有成本效益的电催化剂仍然具有挑战性。在此，使用富含缺陷的 NiMoO4 预催化剂来探索其 OER 活性和重构机制。原位产生的氧空位、扭曲的晶格和边缘位错加速了 NiMoO4 的深度重构，形成用于碱性氧析出的多晶镍（氧）氢氧化物。只需要约 230 和约 285 mV 即可分别达到 10 和 100 mA cm−2。通过在不同指定电位范围下的分段循环伏安法激活结合异位表征技术，实验证实了镍氧化还原促进的重建。随后，基于酸碱电子理论提出了重构路线。因此，揭示了氧气析出过程中吸附质析出机制对重建的主要贡献。这项工作开发了一种合成富含缺陷材料的新途径，并提供了研究重建的新策略。