Preparation of carbon nanotube-supported Pt metal particles covered with silica layers and their application to electrocatalysts for PEMFC

Sakae Takenaka, Hiroshi Matsumori, Takafumi Arike, Hideki Matsune, Masahiro Kishida

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

Carbon nanotube (CNT)-supported Pt metal nanoparticles were covered with silica layers by hydrolysis of 3-aminopropyl-triethoxysilane (APTES) and/or tetraethoxysilane (TEOS). The hydrolysis of only APTES resulted in a uniform coverage of silica layers on Pt/CNT, but the thickness of the silica layers was very thin (<1 nm). Pt/CNT could also be coated with silica layers of a few nanometers in thickness by hydrolysis of TEOS, but exposed surfaces of CNTs in the sample were frequently observed. In contrast, the successive hydrolysis of APTES and TEOS brought about a uniform coverage of silica layers of a few nanometers in thickness on Pt/CNT. The silica-coated Pt/CNT showed high catalytic activity for electrochemical reactions in aqueous H2SO 4 electrolyte, in spite of a uniform coverage of Pt metal with silica layers. In addition, the coverage of Pt/CNT with silica layers improved its durability in electrochemical reactions.

Original languageEnglish
Pages (from-to)731-738
Number of pages8
JournalTopics in Catalysis
Volume52
Issue number6-7
DOIs
Publication statusPublished - Jun 1 2009

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

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