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Citation: LIANG Ying, LIAO Dai-Wei. Effects of pH on the PtRu/C Catalyst Prepared by Microwave-assisted Ethylene Glycol Process[J]. Acta Physico-Chimica Sinica, ;2008, 24(02): 317-322. doi: 10.3866/PKU.WHXB20080223 shu

Effects of pH on the PtRu/C Catalyst Prepared by Microwave-assisted Ethylene Glycol Process

LIANG Ying ,
LIAO Dai-Wei

1.
Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China

Received Date: 10 August 2007
Available Online: 24 December 2007

PtRu nanoparticles supported on the carbon, with different mean particle sizes, were synthesized by microwave-assisted ethylene glycol process, the effects of pH on the PtRu/C catalyst were mainly investigated. UV-Vis spectroscopy, energy dispersive X-ray analysis, transmission electron microscopy, and X-ray diffraction were applied to characterize the PtRu nanoparticles. The solution pH had important influence on the metal particle size. TEMresults indicated that the PtRu mean particle size decreased from 3.5 nm to 1.5 nm with the increase of pH value. However, when pH value reached 11.0, the metal loading of synthesized catalyst decreased distinctly because the metal nanoparticles were protected in solution. The results showed that the PtRu/C catalyst synthesized at pH ca 9.0, with appropriate particle sizes (2.4 nm) and homogenous dispersed particles, had the highest electrocatalytic activity for methanol electrooxidation among all the synthesized catalysts.
- Microwave heating; PtRu catalyst; Particles size; Methanol electrooxidation
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