Highly durable carbon nanotube-supported Pd catalysts covered with silica layers for the oxygen reduction reaction

Sakae Takenaka, Noato Susuki, Hiroaki Miyamoto, Eishi Tanabe, Hideki Matsune, Masahiro Kishida

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Pd metal supported on carbon nanotubes (Pd/CNT) for use as a cathode catalyst in polymer electrolyte fuel cells was covered with silica layers a few nanometers thick to improve the durability of the catalyst under severe cathode conditions. The silica-coated Pd/CNT cathode catalyst showed similar activity for the oxygen reduction to Pd/CNT despite coverage of the Pd metal with a silica insulator. In addition, the silica-coated Pd/CNT was highly durable during potential cycling between 0.05 and 1.20 V (vs. reversible hydrogen electrode) in aqueous HClO4 while Pd/CNT suffered serious deactivation under the same conditions. The silica layers in the silica-coated Pd/CNT prevent the diffusion of dissolved Pd species from the Pd metal out of the layers. Therefore, silica-coated Pd/CNT was highly durable under the cathode conditions. Furthermore, coverage of Pd/CNT with silica layers inhibited the two-electron reduction of oxygen to H2O2.

Original languageEnglish
Pages (from-to)381-388
Number of pages8
JournalJournal of Catalysis
Volume279
Issue number2
DOIs
Publication statusPublished - Apr 25 2011

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Physical and Theoretical Chemistry

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