Journal
NANOSCALE AND MICROSCALE THERMOPHYSICAL ENGINEERING
Volume 14, Issue 2, Pages 110-122Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/15567265.2010.484009
Keywords
oxygen reduction reaction (ORR); platinum; Cu alloy; activation energy; density functional theory (DFT); unity bond index-quadratic exponential potential (UBI-QEP) method
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Funding
- NEDO (New Energy and Industrial Technology Development Organization)
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Theoretical analysis of oxygen reduction reaction (ORR) on cathode Pt(111), Pt3Cu(111), and PtCu(111) surfaces in a polymer electrolyte fuel cell (PEFC) is performed to investigate the ORR mechanisms on Pt(111) and the effect of alloying. From density functional theory (DFT) calculations, we found that the difference in adsorption energy of O2 molecules on the surface has a strong relation with the number of d-electrons and the position of the d-band center of the surface Pt atoms. From the results of the activation energy calculations using the unity bond index-quadratic exponential potential (UBI-QEP) method, we show that the oxygen atom coverage on Pt(111) surface has a strong influence on the ORR activity. In addition, it was found that Pt3Cu(111) and PtCu(111) surfaces have lower coverage compared with that of Pt(111) surface, which results in the enhancement of ORR activity.
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