Carbon nanotube-supported Pd-Co catalysts covered with silica layers as active and stable cathode catalysts for polymer electrolyte fuel cells

Sakae Takenaka, Tomoharu Tsukamoto, Hideki Matsune, Masahiro Kishida

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Carbon nanotube-supported Pd catalysts (Pd/CNT) as the cathode for polymer electrolyte fuel cells (PEFCs) were modified with various transition metals (Fe, Co, Ni and Cu) to improve their catalytic activity for the oxygen reduction reaction (ORR). Modification with these transition metals enhanced the activity of Pd/CNT for the ORR, especially the activity of Pd-Co/CNT, which was 2 times higher than that of Pd/CNT. X-ray diffraction and X-ray absorption spectroscopy indicated that the metal species in Pd-Co/CNT was mainly present as a Pd-Co alloy, which acts as catalytically active sites for the ORR. However, the Pd-Co/CNT catalysts were rapidly deactivated for the ORR in 0.1 M HClO 4 electrolyte due to the dissolution and diffusion of metal species out of the catalysts. Pd-Co/CNT was covered with silica layers with a thickness of a few nanometers, which prevented the diffusion of Co and Pd species into the HClO4 electrolyte. Thus, silica-coated Pd-Co/CNT catalysts exhibited high activity for the ORR and excellent durability under severe cathode conditions.

Original languageEnglish
Pages (from-to)2723-2731
Number of pages9
JournalCatalysis Science and Technology
Volume3
Issue number10
DOIs
Publication statusPublished - Oct 1 2013

All Science Journal Classification (ASJC) codes

  • Catalysis

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