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

研究成果: ジャーナルへの寄稿記事

34 引用 (Scopus)

抄録

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.

元の言語英語
ページ(範囲)381-388
ページ数8
ジャーナルJournal of Catalysis
279
発行部数2
DOI
出版物ステータス出版済み - 4 25 2011

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Carbon Nanotubes
Catalyst supports
Silicon Dioxide
Carbon nanotubes
carbon nanotubes
Silica
Oxygen
silicon dioxide
catalysts
oxygen
Cathodes
cathodes
Metals
Catalysts
metals
Electrolytes
durability
Fuel cells
Hydrogen
deactivation

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Physical and Theoretical Chemistry

これを引用

Highly durable carbon nanotube-supported Pd catalysts covered with silica layers for the oxygen reduction reaction. / Takenaka, Sakae; Susuki, Noato; Miyamoto, Hiroaki; Tanabe, Eishi; Matsune, Hideki; Kishida, Masahiro.

:: Journal of Catalysis, 巻 279, 番号 2, 25.04.2011, p. 381-388.

研究成果: ジャーナルへの寄稿記事

Takenaka, Sakae ; Susuki, Noato ; Miyamoto, Hiroaki ; Tanabe, Eishi ; Matsune, Hideki ; Kishida, Masahiro. / Highly durable carbon nanotube-supported Pd catalysts covered with silica layers for the oxygen reduction reaction. :: Journal of Catalysis. 2011 ; 巻 279, 番号 2. pp. 381-388.
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AU - Takenaka, Sakae

AU - Susuki, Noato

AU - Miyamoto, Hiroaki

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AU - Matsune, Hideki

AU - Kishida, Masahiro

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AB - 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.

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