Zn Dissolution-Passivation Behavior with ZnO Formation via In Situ Characterizations

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外文摘要：In this study,ZnO formation during the dissolution-passivation process of Zn anodes is observed via in situ Raman and optical characterization.The Zn passivation during galvanostatic anodization merely follows the dissolution-precipitation model,whereas that of potentiodynamic polarization exhibits different behaviors in different potential ranges.Initially,the Zn electrode is gradually covered by a ZnO precipitation film and then undergoes solid-state oxidation at～255 mV.The starting point of solid-state oxidation is well indicated by the abrupt current drop and yellow coloration of the electrode surface.During the pseudo passivation,an intense current oscillation is observed.Further,blink-like color changes between yellow and dark blue are revealed for the first time,implying that the oscillation is caused by the dynamic adsorption and desorption of OH groups.The as-formed ZnOs then experience a dissolution-reformation evolution,during which the crystallinity of the primary ZnO film is improved but the solid-state-formed ZnO layer becomes rich in oxygen vacancies.Eventually,oxide densification is realized,contributing to the Zn passivation.This study provides new insights into the Zn dissolution-passivation behavior,which is critical for the future optimization of Zn batteries.

外文关键词：

in situ characterizationZn dissolution and passivationZnO formation

作者：

Tanyanyu Wang、Masahiro Kunimoto、Masahiro Yanagisawa、Masayuki Morita、Takeshi Abe、Takayuki Homma

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作者单位：

Graduate School of Advanced Science and Engineering,Waseda University,1-104 Totsukamachi,Shinjuku-ku,Tokyo 169-8050,Japan

Office of Society-Academia Collaboration for Innovation,Kyoto University,Gokasho,Uji 611-0011,Japan

Graduate School of Engineering,Kyoto University,Kyoto daigaku-katsura,Nishikyo-ku,Kyoto 615-8510,Japan

出版年：

2024

DOI：

10.1002/eem2.12481

能源与环境材料(英文)

ISSN：

年,卷(期)：2024.7(1)