Key Laboratory of Advanced Catalytic Materials and Technology, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou, Jiangsu Province 213164, China.
College of Chemistry Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, P. R. China.
Dalton Trans. 2023 Jun 20;52(24):8466-8472. doi: 10.1039/d3dt01228j.
Limited by single metal active sites and low electrical conductivity, designing nickel-based metal-organic framework (MOF) materials with high activity and durability remains a challenge. Here, a novel class of two-dimensional trimetallic MOF nanosheets with plentiful active sites, rich metal defects, and facilitated mass and electron transfer channels is developed as efficient electrocatalysts for boosting oxygen evolution reaction (OER). The unique 2D nanosheet structure enlarges the active area; meanwhile, the organic ligand in the MOF can work as a pillar to enlarge the interplanar space to boost the ion and electron transportation, and the synergistic effect between multi-metal active sites can effectively promote the electrocatalytic activity. Interestingly, after an electrochemical activation process, the optimized NiFeZn MOF nanosheets can yield abundant metal defects, enabling them to deliver a low overpotential of 233 mV at 10 mA cm with a much smaller Tafel slope of 37.8 mV dec. More importantly, this method is also universal for the synthesis of the NiFe-MOF family for achieving outstanding electrocatalytic OER performance. These findings present a universal strategy for the construction of a novel class of 2D trimetallic MOF nanosheets for the OER.
受限于单一的金属活性位点和较低的电导率，设计具有高活性和耐久性的镍基金属有机骨架（MOF）材料仍然是一个挑战。在这里，开发了一类新型的二维三元 MOF 纳米片，具有丰富的活性位点、丰富的金属缺陷和促进质量和电子转移通道，可用作高效电催化剂以促进氧气析出反应（OER）。独特的 2D 纳米片结构增大了活性面积；同时，MOF 中的有机配体可以作为支柱来增大层间距以促进离子和电子传输，多金属活性位点之间的协同效应可以有效促进电催化活性。有趣的是，经过电化学活化过程后，优化后的 NiFeZn MOF 纳米片可以产生丰富的金属缺陷，使其在 10 mA cm 时仅需 233 mV 的低过电势，并且 Tafel 斜率更小，为 37.8 mV dec。更重要的是，该方法对于合成 NiFe-MOF 族也具有通用性，可实现出色的电催化 OER 性能。这些发现为构建新型二维三元 MOF 纳米片提供了一种通用策略，可用于 OER。
