Enhanced local density of states at the Fermi level of the surface platinum in carbon-supported platinum particles by Nafion ionomer |
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| Authors: | Kee Sung Han Seong-Soo Kim Ki Hyeok Kang Byoung Jean Mean Heon Hwa Choi Oc Hee Han Moohee Lee |
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| Affiliation: | 1. Department of Physics, Konkuk University, 1 Hwayangdong, Gwangjingu, Seoul 143-701, Republic of Korea;2. Analysis Research Division, Daegu Center, Korea Basic Science Institute, 1370 Sankyuckdong, Bookgu, Daegu 702-701, Republic of Korea |
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| Abstract: | 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 (EF-LDOS) of Pt/C catalysts. NIs were observed to increase the surface EF-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 EF-LDOS of Pt particles would be desirable. In addition, a new concept to interpret the surface EF-LDOS was introduced and validated. |
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