Enhanced local density of states at the Fermi level of the surface platinum in carbon-supported platinum particles by Nafion ionomer

195Pt nuclear magnetic resonance (NMR) was employed to study the influence of Nafion ionomers (NIs), a common ingredient used as a proton conducting mediator and binder in a membrane-electrode-assembly (MEA) for proton exchange membrane fuel cells, on the local density of states at the Fermi surface...

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Bibliographic Details
Published in:Electrochemistry communications 2009-02, Vol.11 (2), p.466-468
Main Authors: Han, Kee Sung, Kim, Seong-Soo, Kang, Ki Hyeok, Mean, Byoung Jean, Choi, Heon Hwa, Han, Oc Hee, Lee, Moohee
Format: Article
Language:English
Subjects:
195Pt NMR
Applied sciences
E F-LDOS
Energy
Energy. Thermal use of fuels
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Fuel cell catalysts
Fuel cells
Nafion ionomer
Pt particle
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Summary:195Pt nuclear magnetic resonance (NMR) was employed to study the influence of Nafion ionomers (NIs), a common ingredient used as a proton conducting mediator and binder in a membrane-electrode-assembly (MEA) for proton exchange membrane fuel cells, on the local density of states at the Fermi surface (E F-LDOS) of Pt/C catalysts. NIs were observed to increase the surface E F-LDOS of Pt particles, thereby altering of the catalytic properties of metal particles. This correlates well with the reduction of fuel oxidation rates. Thus, ionomers decreasing the surface E F-LDOS of Pt particles would be desirable. In addition, a new concept to interpret the surface E F-LDOS was introduced and validated.
ISSN:1388-2481
1873-1902
DOI:10.1016/j.elecom.2008.12.023