Mesoporous PdCo sponge-like nanostructure synthesized by electrodeposition and dealloying for oxygen reduction reaction

Satoshi Tominaka, Tomoya Hayashi, Yusuke Nakamura, Tetsuya Osaka

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

A mesoporous PdCo sponge-like nanostructure was successfully synthesized by the combination of electrodeposition and dealloying, and was evaluated as a catalyst for the oxygen reduction reaction of fuel cells. The synthesized film had a sponge-like mesoporosity consisting of 5-30 nm thick ligaments with pores of tens of nanometers. Its porosity was estimated to be ca. 62%, suggesting that the oxygen transport in the film was smooth. The resultant composition was Pd93Co7, whose crystalline phase was determined to be a solid solution of Pd92Co8 by X-ray diffractometry. This degree of alloying is known to induce the most desirable lattice contraction into a Pd catalyst for the oxygen reduction reaction. Actually, the mesoporous PdCo catalyst had a higher specific activity than the Pt catalyst in the potential range of <0.85 V vs. SHE, i.e., the potential range of interest for fuel cell operation. This fascinatingly higher catalytic activity was attributable to the preferable reaction mechanism, because the PdCo electrode had a lower Tafel slope (43 mV decade-1) than a typical Pt electrode (71 mV decade-1).

Original languageEnglish
Pages (from-to)7175-7182
Number of pages8
JournalJournal of Materials Chemistry
Volume20
Issue number34
DOIs
Publication statusPublished - 2010 Sep 14

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Electrodeposition
Nanostructures
Oxygen
Catalysts
Fuel cells
Catalyst activity
Electrodes
Ligaments
Alloying
X ray diffraction analysis
Solid solutions
Porosity
Crystalline materials
Chemical analysis

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemistry(all)

Cite this

Mesoporous PdCo sponge-like nanostructure synthesized by electrodeposition and dealloying for oxygen reduction reaction. / Tominaka, Satoshi; Hayashi, Tomoya; Nakamura, Yusuke; Osaka, Tetsuya.

In: Journal of Materials Chemistry, Vol. 20, No. 34, 14.09.2010, p. 7175-7182.

Research output: Contribution to journalArticle

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