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

被引:74
作者
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 ]
机构
[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
基金
巴西圣保罗研究基金会;
关键词
Ethanol oxidation reaction; Electrocatalysis; Platinum-tin alloys; Nanoparticles; Polymeric precursor method; PT-SN ELECTROCATALYSTS; FUEL-CELLS; FORMIC-ACID; METHANOL OXIDATION; THERMAL-TREATMENT; REDUCTION; TEMPERATURE; MECHANISM;
D O I
10.1016/j.jpowsour.2009.09.065
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
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
引用
收藏
页码:1589 / 1593
页数:5
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