Abstract Recently, metal–organic framework (MOF) manifests an outstanding oxygen evolution reaction (OER) catalytic activity due to its structural diversity, highly ordered pore structure and abundant active sites. Herein, through a facile one-step solvothermal method, iron-doped nickel MOF nanosheets in situ grown on conductive nickel foam (Fe-Ni MOF NSs/NF) were conveniently fabricated as efficient OER catalyst, using only one kind of metal salt precursor. The ultrathin 2-dimensional sheet structure possesses highly exposed surface area and numerous metal sites which are beneficial to electrocatalytic OER performance. The Fe-Ni MOF NSs/NF presents superior OER activity in 1 M KOH, requiring overpotentials of 258 and 270 mV to deliver the current density of 50 and 100 mA cm−2, along with a low Tafel slope of 40.8 mV dec−1. Moreover, the durability of the Fe-Ni MOF NSs/NF catalyst is also outstanding, exhibiting only minor chronoamperometric decay after 24 h continuous operation at 50 mA cm−2. The excellent OER activity could be ascribed to the coupling effects of ultrathin-nanosheet structure, favorable charge transfer kinetics, high conductivity and excellent intrinsic catalytic activity. This facile and economical strategy might be advantageous to prepare other high-performance MOF-based OER catalysts.

中文翻译：

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在泡沫镍上生长的二维掺铁镍 MOF 纳米片用于高效的析氧反应

摘要 近年来，金属有机骨架（MOF）由于其结构多样性、高度有序的孔结构和丰富的活性位点，表现出优异的析氧反应（OER）催化活性。在此，通过简单的一步溶剂热法，仅使用一种金属盐前体，在导电泡沫镍（Fe-Ni MOF NSs/NF）上原位生长的铁掺杂镍 MOF 纳米片被方便地制造为高效的 OER 催化剂。超薄二维片状结构具有高度暴露的表面积和众多有利于电催化 OER 性能的金属位点。Fe-Ni MOF NSs/NF 在 1 M KOH 中表现出优异的 OER 活性，需要 258 和 270 mV 的过电位来提供 50 和 100 mA cm-2 的电流密度，以及 40.8 mV dec-1 的低塔菲尔斜率. 而且，Fe-Ni MOF NSs/NF 催化剂的耐久性也非常出色，在 50 mA cm-2 下连续运行 24 小时后仅表现出轻微的计时电流衰减。优异的OER活性可归因于超薄纳米片结构、良好的电荷转移动力学、高电导率和优异的内在催化活性的耦合效应。这种简便且经济的策略可能有利于制备其他高性能 MOF 基 OER 催化剂。