Synthesizing binder-free metal–organic frameworks (MOF) as thin films on a large scale to serve directly as electrodes for water electrolysis is challenging. Here, we report a simple and readily scalable strategy for fabricating binder-free Cu–Fe–NH₂ based MOF thin film-electrodes directly applicable as a catalyst for water electrolysis. Films composed of thin 2D-nanosheets of the MOF were deposited by dropping ink obtained from solvothermally synthesised bulk MOFs onto nickel foam substrates, or simply immersing the substrates in the ink. The Cu–Fe–NH₂ MOF electrodes demonstrated excellent oxygen evolution reaction (OER) performance, comparable or superior to recently reported state-of-the-art MOFs. Strikingly, the MOF electrodes exhibited a remarkably low OER overpotential of 330 mV at a high current density of 500 mA cm⁻², and excellent durability with a very minor chronopotentiometric decay loss of 1.26% at the end of a 24 h test at a high bias current of 500 mA cm⁻².

中文翻译：

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通过滴铸法制备的Cu–Fe–NH2基金属有机骨架纳米片，可在超高电流下持久耐用的高效氧气释放催化剂

大规模合成无粘合剂的金属有机骨架（MOF）作为薄膜直接用作水电解的电极是一项挑战。在这里，我们报告了一种简单且易于扩展的策略，可用于制造无粘合剂的直接用于水电解的基于Cu-Fe-NH ₂的MOF薄膜电极。通过将由溶剂热合成的块状MOF获得的油墨滴到泡沫镍上，或将基材简单地浸入油墨中，可以沉积由MOF的2D纳米薄片组成的薄膜。Cu–Fe–NH ₂MOF电极表现出出色的氧释放反应（OER）性能，与最近报道的最新MOF相当或更好。引人注目的是，MOF电极在500 mA cm ^-2的高电流密度下显示出330 mV的极低OER过电势，以及出色的耐久性，在高24小时试验结束时，计时电位衰减很小，仅为1.26％偏置电流为500 mA cm ^-2。