Metal organic frameworks (MOFs) are excellent materials for energy storage and conversion. This report describes 2D metal–organic framework nanosheets as an electrocatalyst for the oxygen evolution reaction (OER) under alkaline conditions. An ultrathin nanosheet array of a NiCo-metal–organic framework was grown on nickel foam (NiCo-MOF/NF) by a one-step solvothermal method. The catalytic OER of the NiCO-MOF/NF electrode was analysed by electrochemical methods. The resulting NiCO-MOF/NF exhibited a high current density (50 mA cm⁻²) with an overpotential of 270 mV, a Tafel slope of 35.4 mV dec⁻¹ and a high turnover frequency (TOF) of 0.68 s⁻¹ (η = 0.27 V) towards the OER. The excellent catalytic activity of the MOF towards the OER was due to the two-dimensional nanosheet array of NiCo-MOF with plentiful accessible molecular active sites and excellent mass transport properties. Faster electron transport was also achieved due to the synergetic effect of Co and Ni present on the MOF.

中文翻译：

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基于NiCo-MOF纳米片阵列的析氧反应电催化剂

金属有机框架（MOFs）是用于能量存储和转换的优秀材料。该报告描述了二维金属-有机框架纳米片作为碱性条件下析氧反应（OER）的电催化剂。通过一步溶剂热法在镍泡沫（NiCo-MOF/NF）上生长了镍钴金属有机框架的超薄纳米片阵列。通过电化学方法分析了 NiCO-MOF/NF 电极的催化 OER。得到的 NiCO-MOF/NF 表现出高电流密度 (50 mA cm ^-2 )，过电位为 270 mV，Tafel 斜率为 35.4 mV dec ^-1，高转换频率 (TOF) 为 0.68 s ^-1 ( η= 0.27 V) 朝向 OER。MOF对OER的优异催化活性是由于NiCo-MOF的二维纳米片阵列具有丰富的可及分子活性位点和优异的传质性能。由于存在于 MOF 上的 Co 和 Ni 的协同作用，也实现了更快的电子传输。