Developing highly efficient, cost-effective, non-noble-metal-based electrocatalysts with superior performance and stability for oxygen evolution reactions is of immense challenge as well as great importance for the upcoming sustainable and green energy conversion technologies. The multivariate metal–organic frameworks with hierarchical porous structures and unsaturated coordination modes are considered to be promising emerging energy materials. In this work, a series of multimetallic MOFs were directly grown on nickel foam (NF) through the solvothermal method. Notably, the optimized tetrametallic FeCoNiMn-MOF/NF shows a low overpotential of 239 mV to achieve a current density of 50 mA cm^–2 with a Tafel slope of 62.05 mV dec^–1 for OER in 1 M KOH. It also exhibits excellent stability and durability over 100 h in chronoamperometric studies. The enhanced performance is closely tied to the high activity of iron and nickel ions and the decomposed and reconstructed Ni/Fe–OOH intermediates of the FeCoNiMn-MOF/NF during the OER process, which are revealed by XPS analysis and in situ Raman spectroscopy. This present work demonstrates the feasibility and advantage of utilizing highly efficient and durable multimetallic MOFs for electrocatalytic oxygen evolution.

中文翻译：

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泡沫镍上四金属金属有机骨架电催化剂 FeCoNiMn-MOF 的原位生长增强电催化析氧

开发用于析氧反应的高效、经济、具有优异性能和稳定性的非贵金属电催化剂是一项巨大的挑战，对于即将到来的可持续和绿色能源转换技术也非常重要。具有分级多孔结构和不饱和配位模式的多元金属有机骨架被认为是有前途的新兴能源材料。在这项工作中，通过溶剂热法在泡沫镍（NF）上直接生长了一系列多金属MOF。值得注意的是，优化的四金属 FeCoNiMn-MOF/NF在 1 M KOH 中的 OER 中表现出 239 mV 的低过电势，可实现 50 mA cm ^–2的电流密度，塔菲尔斜率为 62.05 mV dec ^–1 。在计时电流研究中，它还表现出超过 100 小时的出色稳定性和耐用性。 XPS 分析和原位拉曼光谱表明，性能的增强与铁和镍离子的高活性以及 FeCoNiMn-MOF/NF 在 OER 过程中分解和重建的 Ni/Fe-OOH 中间体密切相关。目前的工作证明了利用高效耐用的多金属 MOF 进行电催化析氧的可行性和优势。