期刊
CATALYSIS LETTERS
卷 134, 期 3-4, 页码 288-294出版社
SPRINGER
DOI: 10.1007/s10562-009-0235-1
关键词
Modification of carbon support; Titanium dioxide; Fuel cells; Oxygen reduction reaction; Pt catalyst; Polymer electrolyte fuel cells
资金
- Korean Ministry of Knowledge Economy through the New and Renewable Energy Center [2008-N-FC08-P01-0-000]
The carbon support (C) is modified by its functionalized surface with Ti species and used as a support of Pt catalyst for oxygen reduction reaction (ORR). Anatase TiO2 nanoparticles with the size of 3-5 nm are uniformly dispersed on the modified carbon support (C-Ti). It is shown that the C-Ti is well dispersed in the solution of Pt precursor due to the hydrophilic TiO2 nanoparticles. This causes a uniform distribution of Pt nanoparticles on C-Ti support. The average particle sizes are 2.9, 2.6, and 3.1 nm, respectively, for Pt/C, Pt/C-Ti, and Pt-commercial. The ORR performance is evaluated in terms of both mass-activity and specific activity. It is found that the Pt/C-Ti revealed the highest performance. The enhancement factors of ORR performance on the Pt/C-Ti at the potentials of 0.75, 0.8, and 0.85 V was more than two for both mass activity and specific activity compared to those on the Pt/C. The large surface area of Pt with a favorable electronic structure would be responsible for a superior performance of the Pt/C-Ti in ORR.
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