Synthesis,Characterization and Performance of PtSn/C Electrocatalyst for Direct Ethanol Fuel Cell

Abstract

Abstract: PtSn/C electrocatalysts(Pt₂Sn/C,Pt₃Sn/C,Pt₄Sn/C) with differentn(Pt)/n(Sn) ratios were prepared by a modified polyol process and characterized by XRD,TEM and cyclic voltammetry (CV) techniques. TEM_results show that the mean size of metal particles in the catalysts prepared is smaller than 4 nm with a sharp distribution. XRD results show that all the in-house catalysts have fcc crystalline structure. The crystal lattice parameter a_fcc of Pt in Pt₃Sn/C is 0.394 6 nm,which implies that alloying of Pt and Sn could dilate the cell lattice parameter of Pt. CV and H₂ chemisorption results show that the unit activity of PtSn/C increased. CV results also show that Pt₃Sn/C has the highest activity for ethanol oxidation. Single cell tests with PtSn/C as the anode catalysts show that maximum output power increased with increasing Sn molar fraction,and then decreased. The difference of catalytic activity between PtSn/C with various Sn molar fractions may be caused by the particle size effect,alloying degree between Pt and Sn and the cell internal impedance. The EDX analyses of the Pt₃Sn/C catalyst before and after stabilization test show that the content of both Pt and Sn decreased. The life of PtSn/C catalysts needs to be improved further.

Key words: Electrocatalysts, PtSn, Direct ethanol fuel cell

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JIANG Lu-Hua, ZHOU Zhen-Hua, ZHOU Wei-Jiang, WANG Su-Li, WANG Guo-Xiong, SUN Gong-Quan, XIN Qin, . Synthesis,Characterization and Performance of PtSn/C Electrocatalyst for Direct Ethanol Fuel Cell[J]. Chem. J. Chinese Universities, 2004, 25(8): 1511.

References

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