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

Satoshi Tominaka, Tomoya Hayashi, Yusuke Nakamura, Tetsuya Osaka

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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

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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