Activated Proton Storage in Molybdenum Selenide through Electronegativity Regulation. (15th August 2022)

• Record Type: Journal Article
• Authors: Zhao, Xingyu; Liu, Qian; Zhong, Chenglin; Li, Yu; Chen, Qingguo; Chao, Dongliang; Chen, Minghua
• Is Part Of: Advanced functional materials. Volume 32:Number 43(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-08-15
• Subjects: aqueous zinc‐based batteries -- H + insertion -- oxygen doping -- transition metal dichalcogenides; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202205874
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Layered transition metal dichalcogenides (TMDs) are promising candidates for aqueous zinc‐based batteries owing to the large interlayer distance. Nevertheless, the low specific capacity of unmodified TMDs due to the high binding energy between host materials and carriers in electrolytes hinder their further development. Herein, a simple method to incorporate oxygen is reported to enhance the specific capacity of MoSe2 . The in situ and ex situ characterization results confirm that the oxygen incorporated MoSe2 experiences proton‐dominated insertion electrochemistry during cycling. In addition, the theoretical calculation results demonstrate that the oxygen atoms with high electronegativity can effectively reduce the binding energy of adsorbing H + and change charge distribution in the interlayer. As a result, incorporating oxygen significantly promotes H + adsorption and diffusion, and thus greatly increases the specific capacity of MoSe2 . This study provides an effective strategy to facilitate the kinetics of TMDs, and thus achieve high‐performance aqueous zinc‐based batteries. Abstract : This work demonstrates an electronegativity regulation strategy through incorporating oxygen to achieve high performance aqueous zinc‐based batteries. Compared to pure MoSe2, the oxygen doped MoSe2 displays higher affinity for protons and realizes a more favorable H + insertion kinetics benefiting from the high electronegativity. The oxygen doping strategy significantly improves the specific capacity of MoSe2 .