Dual role of Ce in FeS2/Ni3S2 nanoarray for oxygen evolution reaction: Promoting OH- absorption and *O desorption

被引:1
作者
Wu, Jicheng [1 ]
Wu, Dandan [1 ]
Yuan, Wei [1 ]
Luo, Yixing [2 ]
Han, Zhanpeng [1 ]
Xu, Xiaowei [1 ]
Chang, Shufang [1 ]
Wen, Ming [2 ]
Huang, Changbao [3 ]
机构
[1] Shanghai Inst Technol, Sch Mat Sci & Engn, Shanghai 201418, Peoples R China
[2] Tongji Univ, Sch Chem Sci & Engn, Shanghai Key Lab Chem Assessment & Sustainabil, Shanghai 200092, Peoples R China
[3] Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Hefei 230031, Peoples R China
基金
中国国家自然科学基金;
关键词
Ce doping; Transition metal sulfides; Reconstruction; Oxygen evolution reaction; LAYERED DOUBLE HYDROXIDES;
D O I
10.1016/j.cej.2025.161821
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Rare earth metal-facilitated transition metal sulfide (TMS) for alkaline oxygen evolution reaction (OER) have been widely studied. However, most TMS catalysts undergo reconstruction during the OER process, so it is of farreaching significance to delve into the effect of rare earth doping on the reconfiguration characteristics of TMS catalysts. Here, a Ce-FeS2/Ni3S2 catalyst is prepared, and the dopant Ce not only increases the local OH- concentration on the catalyst surface, but also as an electron acceptor promotes the generation of high-valence metal cations. Synchronously, density functional theory calculations show that for the surface-reconstructed CeFeNiOOH, Ce doping increases the adsorption of OH- on the active site and the desorption of oxygen-containing intermediates *O, resulting in outstanding OER performance. In 1 M KOH, the in-situ reconstructed catalyst exhibites low overpotentials of 190 and 330 mV at 10 and 100 mA cm- 2, respectively, which preserves the structural characteristics of TMS and exposes the active phase oxy-hydroxide (MOOH) more fully. Additionally, it reveals a low cell potential growth rate of 2 mV h-1 in anion exchange membrane simulated industrial electrolysis water. This research contributes to the understanding of TMS catalyst reconstruction mechanism promoted by rare earth doping, and the development of efficient and stable TMS catalysts.
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页数:11
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