Extraordinary Supercapacitor Performance of a Multicomponent and Mixed-Valence Oxyhydroxide

Jianli Kang, Akihiko Hirata, Luyang Chen, Shengli Zhu, Takeshi Fujita, Mingwei Chen

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

We report a novel multicomponent mixed-valence oxyhydroxide-based electrode synthesized by electrochemical polarization of a de-alloyed nanoporous NiCuMn alloy. The multicomponent oxyhydroxide has a high specific capacitance larger than 627 Fcm-3 (1097±95 Fg-1) at a current density of 0.25 Acm-3, originating from multiple redox reactions. More importantly, the oxyhydroxide electrode possesses an extraordinarily wide working-potential window of 1.8 V in an aqueous electrolyte, which far exceeds the theoretically stable window of water. The realization of both high specific capacitance and high working-potential windows gives rise to a high energy density, 51 mWhcm-3, of the multicomponent oxyhydroxide-based supercapacitor for high-energy and high-power applications.

Original languageEnglish
Pages (from-to)8100-8104
Number of pages5
JournalAngewandte Chemie - International Edition
Volume54
Issue number28
DOIs
Publication statusPublished - 2015 Jul 1
Externally publishedYes

Keywords

  • multicomponent oxides
  • nanoporous metals
  • oxyhydroxides
  • polarization
  • supercapacitors

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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