Operando observations of RuO2 catalyzed Li2O2 formation and decomposition in a Li-O2 micro-battery

Chen Hou, Jiuhui Han, Pan Liu*, Chuchu Yang, Gang Huang, Takeshi Fujita, Akihiko Hirata, Mingwei Chen

*この研究の対応する著者

研究成果: Article査読

36 被引用数 (Scopus)

抄録

RuO2 displays excellent bifunctional catalysis towards the oxygen reduction and evolution reactions of Li-O2 battery. Nevertheless, how the solid catalyst successively catalyzes solid Li2O2 formation and decomposition, confronting passivation and loss of RuO2/Li2O2 contact, during discharging and charging remains a mystery. Here we report operando observations of RuO2 catalyzed oxygen reduction and evolution reactions of Li2O2 by utilizing a liquid cell scanning transmission electron microscope. Upon discharging, RuO2 obviously accelerates formation of soluble LiO2 intermediates and acts as preferential sites of Li2O2 precipitation. During charging, the catalytic activation of RuO2 takes place at electrolyte-RuO2-Li2O2 triple-phase interfaces. Importantly, RuO2 not only catalyzes the decomposition of directly contacted Li2O2, but also promotes oxidation of soluble LiO2 for rapid dissolution of isolated Li2O2 nanoparticles by a chemical comproportionation reaction. The observation unveils how RuO2 catalyzes the formation and decomposition of Li2O2 during discharging and charging and provides nanoscale insights into cathodic reactions of Li-O2 batteries with solid catalysts.

本文言語English
ページ(範囲)427-433
ページ数7
ジャーナルNano Energy
47
DOI
出版ステータスPublished - 2018 5月
外部発表はい

ASJC Scopus subject areas

  • 再生可能エネルギー、持続可能性、環境
  • 材料科学(全般)
  • 電子工学および電気工学

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