Jiangsu Collaborative Innovation Centre, of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, No. 1, Wenyuan Road, NanJing, 210023, China.
Jiangsu Province Key Laboratory for, Chemistry of Low-Dimensional Materials, School of Chemistry and Chemical Engineering, Huaiyin Normal University, Huaian, 223300, P.R. China.
Chemistry. 2019 Dec 10;25(69):15830-15836. doi: 10.1002/chem.201903482. Epub 2019 Nov 15.
The energy crisis and environmental pollution have forced scientists to explore alternative energy conversion and storage devices. The anodic reactions of these devices are all oxygen evolution reactions (OER), so the development of efficient OER electrocatalysts is of great significance. At the same time, understanding the reaction mechanism of OER is conducive to the rational design of efficient OER electrocatalysts. In general, catalytic active centers play a direct role in OER performance. In this paper, a series of stable bimetallic metal-organic frameworks (MOFs, named as Fe -Co -X , n=2, 3 and X=F, Cl, Br) with similar structure were synthesized by changing the halogen coordinated with the cobalt metal active center, aiming to investigate the influence of halogen substitution effect on OER performance. It was found that the OER activity of Fe -Co -F is much better than Fe -Co -Cl and Fe -Co -Br , indicating that the regulation of the electronegativity change of the coordination halogen atom can regulate the coordination electron structure of the metal active center, thereby achieving effective regulation of OER performance.
能源危机和环境污染迫使科学家们去探索替代的能源转换和存储设备。这些设备的阳极反应都是析氧反应（OER），因此开发高效的 OER 电催化剂具有重要意义。同时，了解 OER 的反应机理有助于合理设计高效的 OER 电催化剂。通常情况下，催化活性中心直接影响 OER 性能。本文通过改变与钴金属活性中心配位的卤素，合成了一系列结构相似的稳定双金属金属有机骨架（MOFs，命名为 Fe-Co-X，n=2、3 和 X=F、Cl、Br），旨在研究卤素取代效应对 OER 性能的影响。结果发现，Fe-Co-F 的 OER 活性远优于 Fe-Co-Cl 和 Fe-Co-Br，表明调节配位卤原子的电负性变化可以调节金属活性中心的配位电子结构，从而实现对 OER 性能的有效调节。
