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A new synthesis of a highly dispersed and CO tolerant PtSn/C electrocatalyst for low-temperature fuel cell; its electrocatalytic activity and long-term durability

Cited 125 time in Web of Science Cited 129 time in Scopus
Authors
Lim, Dong-Ha; Choi, Dong-Hyeok; Lee, Weon-Doo; Lee, Ho-In
Issue Date
2009
Publisher
Elsevier
Citation
Applied Catalysis B: Environmental 89 (2009) 484–493
Keywords
PtSn/C electrocatalystsBorohydride reduction and hydrothermaltreatmentMethanol oxidationCO toleranceLong-term durabilityLow-temperature fuel cell
Abstract
An effective method is developed for preparing highly dispersed and nano-sized PtSn/C electrocatalysts
synthesized by borohydride reduction and subsequent hydrothermal treatment. From the XRD patterns,
the Pt(2 2 0) peak of the PtSn/C catalysts shift slightly to lower 2u values with increasing Sn content,
compared with that of the Pt/C catalyst, suggesting the alloy formation. Based on the HR-TEM, the PtSn
nanoparticles show average particle sizes of approximately 2.3 nm on the carbon surface, which is
consistent with XRD data. The XPS result shows that the slight shift in the bulk metallic Pt(0) to higher
binding energies is attributed to a significant contribution from the metal-support interaction and the
nano-size effect. The methanol and CO oxidations on the PtSn/C catalysts occur at lower potentials as
compared to the commercial Pt/C catalyst. This result suggests that Sn has the ability to promote the
oxidation of adsorbed CO at lower potentials. In the single-cell and accelerated durability tests, the
3Pt1Sn/C catalyst shows higher performance under a pure H2 and CO-containing H2 gases and better
durability under a 0.5 MH2SO4 solution than the commercial Pt/C catalyst, due to the coexistence of PtSn
alloys and Sn oxides.
ISSN
0926-3373
Language
English
URI
http://hdl.handle.net/10371/61283
DOI
https://doi.org/10.1016/j.apcatb.2009.01.011
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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