文献类型：期刊文献

英文题名：Multiscale Engineering of Nonprecious Metal Electrocatalyst for Realizing Ultrastable Seawater Splitting in Weakly Alkaline Solution

作者：Li, Jiankun[1];Yu, Tingting[1];Wang, Keyu[1];Li, Zhiheng[2];He, Juan[1];Wang, Yixing[1];Lei, Linfeng[1];Zhuang, Linzhou[1];Zhu, Minghui[1];Lian, Cheng[1];Shao, Zongping[3,4];Xu, Zhi[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]China Univ Petr, Sch Chem Engn, Qingdao 266580, Peoples R China;[3]Nanjing Tech Univ, Coll Chem Engn, State Key Lab Mat Oriented Chem Engn, Nanjing 211816, Peoples R China;[4]Curtin Univ, WA Sch Mines Minerals Energy & Chem Engn WASM MEC, Perth, WA 6102, Australia

年份：2022

卷号：9

期号：25

外文期刊名：ADVANCED SCIENCE

收录：;EI(收录号：20222812335083);WOS:【SCI-EXPANDED(收录号:WOS:000821630200001)】；

基金：This work was financially supported by the National Natural Science Foundations of China (Grant Nos. 21908054, 22005098, and 22075076), and Central Government Funds for Guiding Local Science and Technology Development (Grant No. 2021Szvup040). And the authors sincerely thank the Shanghai Synchrotron Radiation Facility (BL14W1, SSRF) for XAS equipment access and the guidance from Prof. Honglai Liu in FEM calculation.

语种：英文

外文关键词：seawater splitting; long-term stability; hollow sphere; XAS; in situ Raman

摘要：Seawater electrolysis is an attractive technique for mass production of high-purity hydrogen considering the abundance of seawater. Nevertheless, due to the complexity of seawater environment, efficient anode catalyst, that should be, cost effective, highly active for oxygen evolution reaction (OER) but negligible for Cl-2/ClO- formation, and robust toward chlorine corrosion, is urgently demanded for large-scale application. Although catalysis typically appears at surface, while the bulk properties and morphology structure also have a significant impact on the performance, thus requiring a systematic optimization. Herein, a multiscale engineering approach toward the development of cost-effective and robust OER electrocatalyst for operation in seawater is reported. Specifically, the engineering of hollow-sphere structure can facilitate the removal of gas product, while atom-level synergy between Co and Fe can promote Co sites transforming to active phase, and in situ transformation of sulfate ions layer protects catalysts from corrosion. As a result, the as-developed hollow-sphere structured CoFeSx electrocatalyst can stably operate at a high current density of 100 mA cm(-2) in the alkaline simulated seawater (pH = 13) for 700 h and in a neutral seawater for 20 h without attenuation. It provides a new strategy for the development of electrocatalysts with a broader application potential.