Effect of borohydride as reducing agent on the structures and electrochemical properties of Pt/C catalyst
Section snippets
Experimental
The 20 wt.% Pt/C catalyst was synthesized by following process: appropriate amount of precursor H2PtCl6 and Vulcan XC-72 carbon were mixed. The mixture was ultrasonicated for 30 min and was reduced by adding 0.05 mol/L NaBH4 aqueous solution dropwise (Pt/B molar ratio is 1:20) at 60 °C. Subsequently, the formed Pt/C catalyst was filtered, washed with excess de-ionized water and dried in a vacuum oven at 80 °C for 2 h. Henceforth, this catalyst will be named as B-Pt.
The 20 wt.% Pt/C catalyst was also
Results and discussion
X-ray diffraction patterns of Pt/C catalysts which synthesized using various reducing agents are shown in Fig. 1. The samples B-Pt and H2-B-Pt show broader reflections compared with samples HCHO-Pt and H2-Pt, indicating a smaller particle size for the formers (see Table 1). On the other hand, when sodium borohydride was employed during preparation of Pt/C catalyst, the characteristic diffraction peaks of Pt(2 2 0), Pt(3 1 1) and Pt(2 2 2) mostly cannot be observed (see Fig. 1). Even these
Acknowledgements
This work was supported by 973 Program (G2000026408), 863 Program (2001AA323060, 2003AA517060) of Science and Technology Ministry of China, The National Natural Science Foundation of China (General Program 20373068, Key Program 20433060) and Natural Science Foundation of Jilin Province (20000510).
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