Interfacial dissociation of contact-ion-pair on MXene electrodes in concentrated aqueous electrolytes

Kijae Kim, Masashi Okubo, Atsuo Yamada*

*この研究の対応する著者

研究成果: Article査読

9 被引用数 (Scopus)

抄録

An aqueous supercapacitor is a prospective energy storage device that achieves affordable clean-energy supply. Although recent intensive research on concentrated electrolytes paved the way to improve its low energy density by expanding the narrow electrochemical potential window of water, it was compromised by slow rate capability with respect to the capacitor standard. In this work, to reveal the rate-determining ion-transport mechanism that limits the reaction kinetics of aqueous capacitor electrodes, electrochemical impedance spectroscopy was conducted on layered titanium carbide (MXene) electrodes with concentrated aqueous electrolytes (water-in-salt and hydrate melt). With increasing salt concentration, the dissociation of contact-ion-pair becomes dominant to ion transport both in the bulk electrolyte and at the electrode-electrolyte interface.

本文言語English
ページ(範囲)A3739-A3744
ジャーナルJournal of the Electrochemical Society
166
15
DOI
出版ステータスPublished - 2019
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 再生可能エネルギー、持続可能性、環境
  • 表面、皮膜および薄膜
  • 電気化学
  • 材料化学

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