Study of ethanol electro-oxidation in acid environment on Pt3Sn/C anode catalysts prepared by a modified polymeric precursor method under controlled synthesis conditions

JOURNAL OF POWER SOURCES

卷:195

Article

De Souza, R. F. B.¹  Parreira, L. S.¹  Rascio, D. C.¹  Silva, J. C. M.¹  Teixeira-Neto, E.¹  Calegaro, M. L.²  Spinace, E. V.³  Neto, A. O.³  Santos, M. C.¹ 

[1] Univ Fed ABC, LEMN, CCNH, BR-09210170 Santo Andre, SP, Brazil

[2] Univ Sao Paulo, Grp Mat Eletroquim & Metodos Eletroanalit, Inst Quim Sao Carlos, BR-13566590 Sao Carlos, SP, Brazil

[3] IPEN CNEN SP, BR-05508900 Sao Paulo, Brazil

关键词: Ethanol oxidation reaction;    Electrocatalysis;    Platinum-tin alloys;    Nanoparticles;    Polymeric precursor method;   

DOI  :  10.1016/j.jpowsour.2009.09.065

来源: Elsevier

【 摘 要 】

A carbon-supported binary Pt3Sn catalyst has been prepared using a modified polymeric precursor method under controlled synthesis conditions This material was characterized using X-ray diffraction (XRD). and the results indicate that 23% (of a possible 25%) of Sn is alloyed with Pt, forming a dominant Pt3Sn phase. Transmission election microscopy (TEM) shows good dispersion of the electrocatalyst and small particle sizes (3 6 nm +/- 1 nm) The polarization curves for a direct ethanol fuel cell using Pt3Sn/C as the anode demonstrated Improved performance compared to that of a PtSn/C E-TEK. especially in the intrinsic resistance-controlled and mass transfer regions. This behavior is probably associated with the Pt3Sn phase. The maximum power density for the Pt3Sn/C electrocatalyst (58 mW cm(-2)) is nearly twice that of a PtSn/C E-TEK electrocatalyst (33 mW cm(-2)) This behavior is attributed to the presence of a mixed Pt9Sn and Pt3Sn alloy phase in the commercial catalysts (C) 2009 Elsevier B V All rights reserved

【 授权许可】

Free