Oxygen evolution reaction (OER) on the anode has become one of the most widely studied electrochemical processes, which poses an important role in several energy generation technologies. In this work, we have designed and synthesized a series of metal–organic framework (MOF)-derived oxides pyrolyzed at different temperatures for efficient water oxidation in alkaline solutions. First, the barrel-shaped BMM-10 microcrystals can be conveniently synthesized under solvothermal conditions, and the hollow morphology of BMM-10-Fe with low crystallinity can be obtained through the fierce hydrolysis of Fe(III) ions. After being oxidized in air, there are only two typical phases of oxides including BMM-10-Fe-L and BMM-10-Fe-H. During electrolysis, BMM-10-Fe-L turns out to be immediately degraded into active Ni/FeOOH nanosheets with improved OER performance, while there is almost no structural and morphological change in BMM-10-Fe-H due to the structural rigidity and robust stability. Furthermore, the optimal BMM-10-Fe-H exhibits a promising electrocatalytic OER performance with a low Tafel slope of 137.4 mV dec^–1, a small overpotential of 260 mV at 10 mA cm^–2, and a high current retention of 93.8% after the stability test. The present work would motivate the scientific community to construct various MOF-derived nanomaterials for efficient energy storage and conversion applications.

中文翻译：

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相变诱导 MOF 衍生的氧化物纳米材料中的差异析氧行为

阳极上的析氧反应（OER）已成为研究最广泛的电化学过程之一，它在多种能源生产技术中发挥着重要作用。在这项工作中，我们设计并合成了一系列在不同温度下热解的金属有机骨架 (MOF) 衍生的氧化物，用于在碱性溶液中有效氧化水。首先，在溶剂热条件下可以方便地合成桶状BMM-10微晶，通过Fe(III)离子的剧烈水解可以获得低结晶度的BMM-10-Fe中空形貌。在空气中氧化后，只有BMM-10-Fe-L和BMM-10-Fe-H两种典型的氧化物相. 在电解过程中，BMM-10-Fe-L 被证明立即降解为活性 Ni/FeOOH 纳米片，具有改善的 OER 性能，而BMM-10-Fe-H由于结构刚性和稳健的稳定性。此外，最佳的BMM-10-Fe-H表现出有前途的电催化 OER 性能，具有 137.4 mV dec ^–1的低 Tafel 斜率，10 mA cm ^{–2 时}的 260 mV 小过电位，以及 93.8% 的高电流保持率稳定性测试后。目前的工作将激励科学界构建各种 MOF 衍生的纳米材料，用于高效的能量存储和转换应用。