文献类型：期刊文献

英文题名：Fluorine-decoration induced deep reconstruction of iron cobalt oxide for high-efficiency oxygen evolution reaction

作者：Qian, Jingxia[1];Shu, Qingli[2];He, Bin[3];Hua, Yinfeng[4];Ge, Xueli[4,5];Sun, Dongping[1];Liu, Wen[6];Zhang, Qi[2];Zhou, Lu[1]

机构：[1]Nanjing Univ Sci & Technol, Sch Chem & Chem Engn, Nanjing 210094, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China;[3]Huzhou Univ, Coll Engn, Huzhou 313000, Peoples R China;[4]Shanghai Pudong Environm Protect Dev Co Ltd, Shanghai 201207, Peoples R China;[5]Shanghai Shengdi Pharmaceut Co Ltd, Shanghai 200100, Peoples R China;[6]Nanyang Technol Univ, Sch Chem Chem Engn & Biotechnol, Singapore 637459, Singapore

年份：2024

卷号：68

起止页码：777

外文期刊名：INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

收录：;EI(收录号：20240020463);WOS:【SCI-EXPANDED(收录号:WOS:001235963500004)】；

基金：This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors. Thanks to the Analysis and Testing Center of Nanjing University of Science and Technology. Thanks to the Chemicals Testing Center of Nanjing University of Science and Technology.

语种：英文

外文关键词：Oxygen evolution reaction; Electrocatalyst; Fluorine modification; Iron cobalt metal oxide

摘要：The oxygen evolution reaction (OER) is a pivotal process in water electrolysis systems, yet developing costeffective and highly active OER electrocatalysts from earth -abundant materials through straightforward methods remains a formidable challenge. In this study, FeCo oxides and their fluorides are synthesized using a one-step room -temperature process followed by fluorination with fluorine gas. We compared the OER performance of Fe, Co, and FeCo oxides and investigated the impact of fluorine doping on their physical properties and OER efficiency. Results revealed that the FeCo - O bimetallic oxide exhibited an overpotential of 370 mV in an alkaline electrolyte at a current density of 10 mA/cm 2 , significantly surpassing the performance of monometallic Fe - O (1 V) and Co - O (467 mV). Fluorine modification markedly enhanced the OER activity of these materials, with Fe -OF at 570 mV, Co -OF at 330 mV, and FeCo-OF at 285 mV. Notably, FeCo-OF demonstrated a stable overpotential lower than commercial RuO 2 (289 mV) during a continuous 12 h OER test. Electrochemical analyses and spectral characterizations indicated that fluorine ion electronic regulation facilitated efficient electrocatalytic active sites in the spent FeCo-OF catalyst through in situ self -reconstruction, leading to its stable and superior OER performance. Density functional theory (DFT) calculations confirmed that fluorine modification of the bimetallic oxides decreased the O* Gibbs free energy from 4.86 to 2.44 eV, thereby enhancing the kinetics of the OER reaction.