期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 500, 期 2, 页码 241-246出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.04.018
关键词
Platinum alloy; Electrocatalysis; Grain size distribution; Oxygen reduction reaction (ORR); X-ray diffraction (XRD)
资金
- The Southern Federal University [05/6-114]
- Russian Foundation for Basic Research [08-08-00869]
Pt-Co/C electrocatalysts with Pt loadings close to 30 wt.% prepared by the impregnation method in water ethylene glycol solutions were investigated by X-ray diffraction and correlated with electrochemical measurements. We show that composition of the binary solvent controls the average particle size and its distribution. The unit cell parameter of the Pt(3)Co alloy decreases nonlinearly with decreasing particle size. The ORR activity of the prepared Pt-Co/C catalysts in H(2)SO(4) solution enhances with decreasing particle size and unit cell parameter as well as with narrowing of the particle size distribution. Corrosion treatment of the synthesized Pt-Co/C materials brings about an increase of ca. 1 nm in the average grain size accompanied by broadening of the grain size distribution and a decrease in the Co content. All of the synthesized Pt-Co/C materials show higher ORR activities compared with commercial Pt/C electrocatalysts. (C) 2010 Elsevier B.V. All rights reserved.
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