Nanoporous metal/oxide hybrid electrodes for electrochemical supercapacitors

Xingyou Lang, Akihiko Hirata, Takeshi Fujita, Mingwei Chen*

*この研究の対応する著者

研究成果: Article査読

1788 被引用数 (Scopus)

抄録

Electrochemical supercapacitors can deliver high levels of electrical power and offer long operating lifetimes, but their energy storage density is too low for many important applications. Pseudocapacitive transition-metal oxides such as MnO2 could be used to make electrodes in such supercapacitors, because they are predicted to have a high capacitance for storing electrical charge while also being inexpensive and not harmful to the environment. However, the poor conductivity of MnO 2 (10 -5-10 -6 S cm -1) limits the charge/discharge rate for high-power applications. Here, we show that hybrid structures made of nanoporous gold and nanocrystalline MnO 2 have enhanced conductivity, resulting in a specific capacitance of the constituent MnO 2 (∼1,145 F g -1) that is close to the theoretical value. The nanoporous gold allows electron transport through the MnO2, and facilitates fast ion diffusion between the MnO2 and the electrolytes while also acting as a double-layer capacitor. The high specific capacitances and charge/discharge rates offered by such hybrid structures make them promising candidates as electrodes in supercapacitors, combining high-energy storage densities with high levels of power delivery.

本文言語English
ページ(範囲)232-236
ページ数5
ジャーナルNature Nanotechnology
6
4
DOI
出版ステータスPublished - 2011 4月
外部発表はい

ASJC Scopus subject areas

  • バイオエンジニアリング
  • 原子分子物理学および光学
  • 生体医工学
  • 材料科学(全般)
  • 凝縮系物理学
  • 電子工学および電気工学

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