析氧
双金属片
X射线光电子能谱
电化学
材料科学
电极
分解水
电解质
化学工程
镍
电催化剂
金属有机骨架
催化作用
无机化学
金属
化学
冶金
物理化学
光催化
有机化学
吸附
工程类
作者
Yingkai Guan,Tingting Liu,Yuanyuan Wu,Xianyu Chu,Бо Лю,Ningtao Zhang,Guangbo Che,Wei Jiang,Chunbo Liu
标识
DOI:10.1016/j.ijhydene.2023.11.244
摘要
Understanding the self-reconstruction process of metal-organic frameworks (MOFs) in alkaline electrolytes is extremely important for the development of efficient electrocatalysts for the oxygen evolution reaction (OER). In this study, we synthesized MOF-74 in-situ on activated nickel-iron foam (NFF) to create a self-supporting MOF-74/NFF(40) electrode without the need for an imposed metal species. It was found that the prepared MOF-74/NFF(40) electrode possessed the best electrocatalytic OER performance, which can achieve the current density of 10, 50, 100 mA cm−2 in 1 M KOH at overpotentials of 227,295 and 357 mV, respectively. X-ray photoelectron spectroscopy (XPS) revealed that the OER process altered the local electron structure of Fe and Ni atoms, resulting in electron transfer from Fe to Ni and promoting oxygen production through bimetallic synergy. Furthermore, the electrochemical reconstruction process on the electrode surface in-situ generated metal hydroxides and hydroxyl oxides, which acted as the main active species to accelerate OER. This study presents a simple and effective approach for synthesizing high-performance and long-lasting MOF-based electrocatalysts for OER.
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