Electrocatalytic activities for the reduction of oxygen of carbon particles modified with polypyrrole including various metal ions as electrocatalytic sites

Makoto Yuasa, Kenichi Oyaizu, Hidenori Murata, Ken Tanaka, Masakuni Yamamoto, Shinichi Sasaki

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We reported that carbon black modified with cobalt and various transition metal ions (M) incorporated in a polypyrrole film (Co+MPPy/C) were good electrocatalysts for the reduction of oxygen (O2). After heat treatment of the catalysts at 600 to 650°C under argon atmosphere, which were prepared using with iron and iridium ions as M, the resulted catalysts gave rise to the reduction of O2 at a remarkably positive potential (Ep > 0.40 V vs SCE). Rotating ring disk voltammetry (RRDV) revealed that Co+IrPPy/C reduced O2 completely with four electrons (nav = 4.0). X-ray photoelectron spectroscopy and X-ray diffraction indicated that the cobalt and M ions were coordinated with nitrogen as the donor atoms and the active sites were maintained even after the heat treatment under argon atmosphere without aggregation of metals and formation of alloys.

Original languageEnglish
Pages (from-to)800-806
Number of pages7
JournalElectrochemistry
Volume75
Issue number10
Publication statusPublished - 2007 Oct
Externally publishedYes

Fingerprint

Argon
Polypyrroles
Cobalt
Metal ions
Carbon
Heat treatment
Ions
Oxygen
Soot
Iridium
Catalysts
Electrocatalysts
Voltammetry
Carbon black
Transition metals
Nitrogen
Agglomeration
Iron
X ray photoelectron spectroscopy
Metals

Keywords

  • Electrocatalyst
  • Heat treatment
  • Polypyrrole film
  • RRDV

ASJC Scopus subject areas

  • Electrochemistry

Cite this

Electrocatalytic activities for the reduction of oxygen of carbon particles modified with polypyrrole including various metal ions as electrocatalytic sites. / Yuasa, Makoto; Oyaizu, Kenichi; Murata, Hidenori; Tanaka, Ken; Yamamoto, Masakuni; Sasaki, Shinichi.

In: Electrochemistry, Vol. 75, No. 10, 10.2007, p. 800-806.

Research output: Contribution to journalArticle

Yuasa, Makoto ; Oyaizu, Kenichi ; Murata, Hidenori ; Tanaka, Ken ; Yamamoto, Masakuni ; Sasaki, Shinichi. / Electrocatalytic activities for the reduction of oxygen of carbon particles modified with polypyrrole including various metal ions as electrocatalytic sites. In: Electrochemistry. 2007 ; Vol. 75, No. 10. pp. 800-806.
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AU - Sasaki, Shinichi

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