The Critical Role of Additive Sulfate for Stable Alkaline Seawater Oxidation on Nickel-Based Electrodes

被引:204
|
作者
Ma, Tengfei [1 ,2 ]
Xu, Wenwen [1 ]
Li, Boran [1 ,4 ]
Chen, Xu [1 ]
Zhao, Jiajun [3 ]
Wan, Shusheng [3 ]
Jiang, Kun [3 ]
Zhang, Sixie [1 ,2 ]
Wang, Zhongfeng [1 ,2 ]
Tian, Ziqi [1 ,2 ]
Lu, Zhiyi [1 ,2 ]
Chen, Liang [1 ,2 ]
机构
[1] Chinese Acad Sci, Inst New Energy Technol, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Shanghai Jiao Tong Univ, Inst Fuel Cells, Interdisciplinary Sci Res Ctr, Sch Mech Engn, Shanghai 200240, Peoples R China
[4] Beijing Univ Chem Technol, Beijing 100029, Peoples R China
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
alkaline seawater oxidation; anodes; electrolysis; electrolyte regulation; sulfates; OXYGEN EVOLUTION; EFFICIENT; CORROSION; CATALYST; FILM; INHIBITION;
D O I
10.1002/anie.202110355
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Seawater electrolysis to produce hydrogen is a critical technology in marine energy projects; however, the severe anode corrosion caused by the highly concentrated chloride is a key issue should be addressed. In this work, we discover that the addition of sulfate in electrolyte can effectively retard the corrosion of chloride ions to the anode. We take nickel foam as the example and observe that the addition of sulfate can greatly improve the corrosion resistance, resulting in prolonged operating stability. Theoretical simulations and in situ experiments both demonstrate that sulfate anions can be preferentially adsorbed on anode surface to form a negative charge layer, which repulses the chloride ions away from the anode by electrostatic repulsion. The repulsive effect of the adsorbed sulfate is also applicable in highly-active catalyst (nickel iron layered double hydroxide) on nickel foam, which shows ca. 5 times stability of that in traditional electrolyte.
引用
收藏
页码:22740 / 22744
页数:5
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