Journal
JOURNAL OF POWER SOURCES
Volume 177, Issue 2, Pages 314-322Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2007.11.036
Keywords
high loading; Pt nanoparticles; carbon nanotubes; glacial acetic acid; electrocatalysis; proton exchange membrane fuel cells
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Composite electrodes consisting of Pt nanoparticles-supported on multiwalled carbon nanotubes grown directly on carbon paper (Pt/CNTs/carbon paper) have been synthesized by a new method using glacial acetic acid as a reducing agent. Transmission electron microscopy (TEM) images show that the Pt nanoparticles with high density and relative small in size (2-4 nm) were monodispersed on the surface of CNTs. X-ray photoelectron spectroscopy (XPS) analysis indicates that the glacial acetic acid acts as a reducing agent and has the capability of producing a high density of oxygen-containing functional groups on the surface of CNTs that leads to high density and monodispersion of Pt nanoparticles. Compared with standard Pt/C electrode, the Pt/CNT/carbon paper composite electrodes exhibit higher electrocatalytic activity for methanol oxidation reaction and higher single-cell performance in a H-2/O-2 fuel cell. (C) 2007 Elsevier B.V. All rights reserved.
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