文献类型：期刊文献

英文题名：Anion-tuning of cobalt-based chalcogenides for efficient oxygen evolution in weakly alkaline seawater

作者：Li, Jiankun[1];Xu, Fang[1];Wang, Keyu[1];He, Juan[1];Wang, Yixing[1];Lei, Linfeng[1];Zhu, Minghui[1];Zhuang, Linzhou[1];Xu, Zhi[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2023

卷号：267

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20225113270871);WOS:【SCI-EXPANDED(收录号:WOS:000895675400002)】；

基金：Acknowledgements This work was financially supported by the National Key R&D Program of China (Grant No. 2021YFB3801301) , and the National Natural Science Foundations of China (Grant No. 21908054, 22005098, and 22075076) , and Central Government Funds for Guiding Local Science and Technology Development (Grant No. 2021Szvup040) . And we sincerely thank the Shanghai Synchrotron Radiation Facility (BL14W1, SSRF) for XAS equipment access.

语种：英文

外文关键词：Seawater splitting; Cobalt -based chalcogenide; Electronic structure; XAS; Long-term stability

摘要：Regulating the electronic structure is of great importance for improving the performance, stability, and selectivity of seawater splitting catalysts. Herein, cobalt-based oxide and chalcogenide (Co3X4, X = O, S, and Se) are synthesized to investigate the effect of anions on the electronic structure, catalytic perfor-mance and selectivity of the seawater oxidation catalysts. The theoretical calculations predict the possi-ble active sites of oxygen evolution reaction and hypochlorite evolution reaction. Then the experimental characterization and calculation results demonstrate that S and Se substitution could regulate the elec-tronic structure and d-band center of Co site, enhance the metallicity of catalysts. Moreover, the energy barrier of Cl* conversion to ClO- could be modulated for preventing the formation of ClO- by anions reg-ulating. Consequently, Co3S4 could stably operate at a current density of 100 mA cm -2 in 0.1 M KOH + 0.6 M NaCl for 100 h and in neutral seawater for 20 h.(c) 2022 Elsevier Ltd. All rights reserved.