{"title":"Redox electrolyte reactions under water-in-salt conditions: A mini review","authors":"Jaeyoung Lee, Jinho Chang","doi":"10.1002/bkcs.70057","DOIUrl":null,"url":null,"abstract":"<p>This review explores the electrochemical behavior of various redox electrolytes in water-in-salt electrolytes (WISEs), a class of highly concentrated salt electrolytes—mainly composed of LiTFSI—that significantly expand the electrochemical window in aqueous systems. In addition to the hydrogen evolution reaction and the oxygen evolution reaction, the review covers the electrochemical behavior in electrodeposition of metals, halides, ferri/ferrocyanide, and several organic redox electrolytes (TEMPO, Quinone, and Pyrazine) in WISEs. The influence of highly concentrated salt electrolytes on solvation structures and their impact on the stability, reversibility, and degradation mechanisms of these redox-active species are discussed, emphasizing the impact of solvation structure transitions on the electrochemical nature of various redox electrolytes.</p>","PeriodicalId":54252,"journal":{"name":"Bulletin of the Korean Chemical Society","volume":"46 9","pages":"867-881"},"PeriodicalIF":2.2000,"publicationDate":"2025-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Bulletin of the Korean Chemical Society","FirstCategoryId":"92","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/bkcs.70057","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
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Abstract
This review explores the electrochemical behavior of various redox electrolytes in water-in-salt electrolytes (WISEs), a class of highly concentrated salt electrolytes—mainly composed of LiTFSI—that significantly expand the electrochemical window in aqueous systems. In addition to the hydrogen evolution reaction and the oxygen evolution reaction, the review covers the electrochemical behavior in electrodeposition of metals, halides, ferri/ferrocyanide, and several organic redox electrolytes (TEMPO, Quinone, and Pyrazine) in WISEs. The influence of highly concentrated salt electrolytes on solvation structures and their impact on the stability, reversibility, and degradation mechanisms of these redox-active species are discussed, emphasizing the impact of solvation structure transitions on the electrochemical nature of various redox electrolytes.
期刊介绍：
The Bulletin of the Korean Chemical Society is an official research journal of the Korean Chemical Society. It was founded in 1980 and reaches out to the chemical community worldwide. It is strictly peer-reviewed and welcomes Accounts, Communications, Articles, and Notes written in English. The scope of the journal covers all major areas of chemistry: analytical chemistry, electrochemistry, industrial chemistry, inorganic chemistry, life-science chemistry, macromolecular chemistry, organic synthesis, non-synthetic organic chemistry, physical chemistry, and materials chemistry.
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