文献类型：期刊文献

英文题名：Phase Equilibrium Regulation in ZIF-67-Derived Electrocatalysts: Degradation Mechanism and Stability Enhancement for Oxygen Evolution Reaction

作者：Han, Cheng[1];Lv, Yao[1];Tang, Xuan[1];Zhang, Sixie[2];Jiang, Yongjun[1];Lu, Zhiyi[2];Dai, Sheng[1]

机构：[1]East China Univ Sci & Technol, Key Lab Adv Mat & Feringa Nobel Prize Scientist Jo, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Zhejiang Key Lab Adv Fuel Cells & Electrolyzers Te, Ningbo 315201, Zhejiang, Peoples R China

年份：2025

卷号：25

期号：29

起止页码：11484

外文期刊名：NANO LETTERS

收录：;EI(收录号：20252818758136);WOS:【SCI-EXPANDED(收录号:WOS:001526306000001)】；

基金：This work was supported by the National Natural Science Foundation of China (22376062), the Science and Technology Commission of Shanghai Municipality (24DX1400200 and 22ZR1415700), Ningbo Yongjiang Talent Introduction Programme (2021A-036-B), the Ningbo S&T Innovation 2025 Major Special Program (2022Z205), and the Fundamental Research Funds for the Central Universities. Additional support was provided by the Frontiers Science Center for Materiobiology and Dynamic Chemistry and the Feringa Nobel Prize Scientist Joint Research Center at East China University of Science and Technology.

语种：英文

外文关键词：ZIF-67; OER; identical locationTEM; structure evolution; active sites

摘要：Metal-organic frameworks (MOFs) like ZIF-67 are promising electrocatalysts due to their tunable structures and porosity, but their instability in aqueous electrolytes requires a deeper understanding. This study investigates the structural evolution and degradation mechanism of ZIF-67 during the oxygen evolution reaction (OER) in alkaline media. Using atomic-resolution identical-location transmission electron microscopy, we reveal its transformation pathway: ZIF-67 first converts to Co(OH)2, then progressively evolves into catalytically active CoOOH and inactive CoO species, ultimately establishing a dynamic three-phase equilibrium under operational conditions. Prolonged cycling drives the irreversible conversion of Co(OH)2 to CoO, depleting the Co(OH)2 reservoir required to sustain the active CoOOH phase via equilibrium dynamics. By lowering the reaction temperature (e.g., to 0 degrees C), Co(OH)2 preservation improves stability, reducing overpotential increases after 5000 cycles to just 9 mV (10 mA cm-2) and 15 mV (100 mA cm-2), outperforming room-temperature performance. These insights highlight phase equilibrium regulation as a key strategy for enhancing the MOF-derived catalyst durability.