The laboratory-scale catalyst synthesis is far from reaching the expectations of industrial-scale water electrolysis, and the bottleneck is the large-scale preparation of electrocatalysts. Herein, a cheap, efficient, and durable electrocatalyst (Mo–Co–O-ZIF) with two-dimensional nanosheet arrays in situ grown on pre-oxidized nickel foam is successfully synthesized through a time and energy-saving strategy. Significantly, this facile method is easy to scale up to produce 600 cm²-sized self-supporting electrodes with excellent reproducibility of both catalytic activity and microstructure. Since the well-designed nanosheet array structure has hydrophilic and oxygen-repellent properties, it provides a large active area and fast electron/mass transport during the catalytic oxygen evolution reaction. As a result, optimized Mo–Co–O-ZIF achieves an ultralow overpotential of 375 mV at 100 mA cm⁻² and a small Tafel slope of 56.1 mV dec⁻¹. Particularly, Mo–Co–O-ZIF exhibits long-term durability at high current densities, which has great significance for industrial oxygen production. The mechanism of excellent catalytic activity and stability are also systematically elucidated by systematic characterizations and electrochemical measurements. This study presents a methodology that enables the development of efficient and scalable electrocatalysts for industrial water electrolysis, resulting in significant time and energy savings.

中文翻译：

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用于工业析氧的 ZIF 衍生电催化剂的大规模制造

实验室规模的催化剂合成远未达到工业规模水电解的预期，瓶颈在于电催化剂的规模化制备。在此，通过节省时间和能源的策略，成功合成了一种廉价、高效、耐用的电催化剂（Mo-Co-O-ZIF），其具有在预氧化泡沫镍上原位生长的二维纳米片阵列。值得注意的是，这种简便的方法很容易放大生产600 cm ²尺寸的自支撑电极，并且催化活性和微观结构具有优异的再现性。由于精心设计的纳米片阵列结构具有亲水和疏氧的特性，因此它在催化析氧反应过程中提供了大的活性面积和快速的电子/质量传输。结果，优化的Mo-Co-O-ZIF在100 mA cm ^{-2下实现了375 mV的超低过电势和56.1 mV dec -1}的小塔菲尔斜率。特别是Mo-Co-O-ZIF在高电流密度下表现出长期的耐久性，这对于工业制氧具有重要意义。通过系统表征和电化学测量，也系统地阐明了优异催化活性和稳定性的机制。这项研究提出了一种方法，可以开发用于工业水电解的高效且可扩展的电催化剂，从而节省大量时间和能源。