期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 56, 期 17, 页码 12602-12612出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.2c03913
关键词
electrochemistry; desalination; capacitive deionization; carbon; Faradaic reaction
资金
- Institute for Basic Science in Republic of Korea [IBS-R006-A2]
- New Faculty Startup Fund [0456-20220022]
- Seoul National University in Republic of Korea
This article thoroughly investigates the surface electrochemistry of carbon electrodes and the Faradaic reactions responsible for the stability issues in capacitive deionization (CDI) systems. By using bare and membrane CDI as model systems, the authors identified various electrochemical reactions of carbon electrodes with water or oxygen, and constructed a complete overview of the Faradaic reactions occurring in CDI.
Recent advances in electrochemical desalination techniques have paved way for utilization of saline water. In particular, capacitive deionization (CDI) enables removal of salts with high energy efficiency and economic feasibility, while its applicability has been challenged by degradation of carbon electrodes in long-term operations. Herein, we report a thorough investigation on the surface electrochemistry of carbon electrodes and Faradaic reactions that are responsible for stability issues of CDI systems. By using bare and membrane CDI (MCDI) as model systems, we identified various electrochemical reactions of carbon electrodes with water or oxygen, with thermodynamics and kinetics governed by the electrode potential and pH. As a result, a complete overview of the Faradaic reactions taking place in CDI was constructed by tracing the physicochemical changes occurring in CDI and MCDI systems.
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