海水
电解
电解质
催化作用
无机化学
析氧
氧化物
化学
阳极
氯
氯化物
电解水
材料科学
化学工程
电化学
物理化学
电极
有机化学
地质学
海洋学
工程类
作者
Amar A. Bhardwaj,Johannes G. Vos,Marissa Beatty,Amanda F. Baxter,Marc T. M. Koper,Ngai Yin Yip,Daniel V. Esposito
出处
期刊:ACS Catalysis
[American Chemical Society]
日期:2021-01-12
卷期号:11 (3): 1316-1330
被引量:134
标识
DOI:10.1021/acscatal.0c04343
摘要
Seawater electrolysis is an attractive approach for producing clean hydrogen fuel in scenarios where freshwater is scarce and renewable electricity is abundant. However, chloride ions (Cl–) in seawater can accelerate electrode corrosion and participate in the undesirable chlorine evolution reaction (CER). This problem is especially acute in acidic conditions that naturally arise at the anode as a result of the desired oxygen evolution reaction (OER). Herein, we demonstrate that ultrathin silicon oxide (SiOx) overlayers on model platinum anodes are highly effective at suppressing the CER in the presence of 0.6 M Cl– in both acidic and unbuffered pH-neutral electrolytes by blocking the transport of Cl– to the catalytically active buried interface while allowing the desired oxygen evolution reaction (OER) to occur there. The permeability of Cl– in SiOx overlayers is 3 orders of magnitude less than that of Cl– in a conventional salt-selective membrane used in reverse osmosis desalination. The overlayers also exhibit robust stability over 12 h in chronoamperometry tests at moderate overpotentials. SiOx overlayers demonstrate a promising step toward achieving selective and stable seawater electrolysis without the need to adjust the pH of the electrolyte.
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