High durability of carbon nanotube-supported Pt electrocatalysts covered with silica layers for the cathode in a PEMFC

Sakae Takenaka, Hiroshi Matsumori, Hideki Matsune, Eishi Tanabe, Masahiro Kishida

研究成果: Contribution to journalArticle査読

66 被引用数 (Scopus)

抄録

Multiwalled carbon nanotube (CNT)-supported Pt nanoparticles (Pt/CNT) were covered with silica layers by successive hydrolysis of 3-aminopropyl- triethoxysilane and tetraethoxysilane on CNTs with Pt metal precursors, followed by reduction with hydrogen. The Pt/CNT covered with silica layers (SiO 2/Pt/CNT) was used as a cathode catalyst for a proton exchange membrane fuel cell (PEMFC). The activity of SiO2/Pt/CNT catalyst for the oxygen reduction reaction in a single-cell PEMFC was similar to that of Pt/CNT, in spite of the uniform coverage of Pt with silica layers, indicating that the coverage of Pt/CNT with silica layers did not appreciably decrease the catalytic activity. In addition, SiO2/Pt/CNT electrocatalyst showed high stability during potential cycling from 0.05 to 1.20 V vs reversible hydrogen electrode in an aqueous H2SO4 electrolyte, whereas Pt/CNT significantly deactivated during the experiment. The structural change of Pt species in these electrocatalysts during potential cycling was investigated by transmission electron microscopy images and Pt L III-edge X-ray absorption fine structure. The crystallite size of Pt metal in SiO2/Pt/CNT did not change appreciably during the potential cycling, while Pt metal crystallites in Pt/CNT seriously aggregated. Silica layers enveloping Pt metal particles in SiO2/Pt/CNT prevent the dissolution and redeposition of Pt metal particles as well as the agglomeration of Pt metal particles on the supports.

本文言語英語
ジャーナルJournal of the Electrochemical Society
155
9
DOI
出版ステータス出版済み - 8 15 2008

All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 再生可能エネルギー、持続可能性、環境
  • 凝縮系物理学
  • 表面、皮膜および薄膜
  • 電気化学
  • 材料化学

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