Nanoporous metal/oxide hybrid electrodes for electrochemical supercapacitors

Xingyou Lang, Akihiko Hirata, Takeshi Fujita, Mingwei Chen

Research output: Contribution to journalArticle

1361 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)232-236
Number of pages5
JournalNature Nanotechnology
Volume6
Issue number4
DOIs
Publication statusPublished - 2011 Jan 1
Externally publishedYes

Fingerprint

electrochemical capacitors
Oxides
metal oxides
Capacitance
Metals
Gold
Energy storage
Electrodes
hybrid structures
electrodes
capacitance
energy storage
gold
conductivity
Electrolytes
Transition metals
Capacitors
Ions
delivery
transition metals

ASJC Scopus subject areas

  • Bioengineering
  • Atomic and Molecular Physics, and Optics
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Nanoporous metal/oxide hybrid electrodes for electrochemical supercapacitors. / Lang, Xingyou; Hirata, Akihiko; Fujita, Takeshi; Chen, Mingwei.

In: Nature Nanotechnology, Vol. 6, No. 4, 01.01.2011, p. 232-236.

Research output: Contribution to journalArticle

Lang, Xingyou ; Hirata, Akihiko ; Fujita, Takeshi ; Chen, Mingwei. / Nanoporous metal/oxide hybrid electrodes for electrochemical supercapacitors. In: Nature Nanotechnology. 2011 ; Vol. 6, No. 4. pp. 232-236.
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