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Issue 10, 2013
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Carbon nanotube-supported Pd–Co catalysts covered with silica layers as active and stable cathode catalysts for polymer electrolyte fuel cells

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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 HClO4 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.

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

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Publication details

The article was received on 28 Jun 2013, accepted on 16 Jul 2013 and first published on 16 Jul 2013


Article type: Paper
DOI: 10.1039/C3CY00446E
Catal. Sci. Technol., 2013,3, 2723-2731

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

    S. Takenaka, T. Tsukamoto, H. Matsune and M. Kishida, Catal. Sci. Technol., 2013, 3, 2723
    DOI: 10.1039/C3CY00446E

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