Ethanol oxidation on a carbon-supported Pt75Sn25 electrocatalyst prepared by reduction with formic acid:: Effect of thermal treatment

被引:144
作者
Colmati, Flavio [1 ]
Antolini, Ermete [1 ]
Gonzalez, Emesto R. [1 ]
机构
[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil
关键词
Pt-Sn alloys; ethanol oxidation; direct ethanol fuel cells; thermal treatment;
D O I
10.1016/j.apcatb.2006.06.013
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 Pt-Sn electrocatalyst in the Pt:Sn atomic ratio 75:25 was prepared by the reduction of Pt and Sn precursors with formic acid and thermally treated at 200 degrees C (Pt-Sn200) and 500 degrees C (Pt-Sn500). Thermal treatment at both temperatures gave rise to the formation of a predominant phase of cubic Pt3Sn and, to a lesser extent, a hexagonal PtSn phase. The amount of the hexagonal PtSn phase as well as the particle size increased with increasing thermal treatment temperature. The formation of some very large particles (size > 30 nm) was apparent in the Pt-Sn500 catalyst. The activity for the ethanol oxidation reaction (EOR) and the performance in a single direct ethanol fuel cell (DEFC) of the catalyst thermally treated at 200 degrees C were better than both the as-prepared catalyst and Pt75Sn25/C by ETEK. The higher activity for the EOR of the Pt-Sn200 sample was ascribed to the presence of the Pt3Sn phase and to cleaning effect of the thermal treatment at 200 degrees C. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:106 / 115
页数:10
相关论文
共 33 条
[1]   Experimental and DFT studies of the conversion of ethanol and acetic acid on PtSn-based catalysts [J].
Alcala, R ;
Shabaker, JW ;
Huber, GW ;
Sanchez-Castillo, MA ;
Dumesic, JA .
JOURNAL OF PHYSICAL CHEMISTRY B, 2005, 109 (06) :2074-2085
[2]   Formation of carbon-supported PtM alloys for low temperature fuel cells: a review [J].
Antolini, E .
MATERIALS CHEMISTRY AND PHYSICS, 2003, 78 (03) :563-573
[3]   Carbon-supported Pt-Sn electrocatalysts for the anodic oxidation of H2, CO, and H2/CO mixtures.: Part II:: The structure-activity relationship [J].
Arenz, M ;
Stamenkovic, V ;
Blizanac, BB ;
Mayrhofer, KJJ ;
Markovic, NM ;
Ross, PN .
JOURNAL OF CATALYSIS, 2005, 232 (02) :402-410
[4]   Synthesis of PtSn/carbon nanocomposites using trans-PtCl(PEt3)2(SnCl3) as the source of metal [J].
Boxall, DL ;
Kenik, EA ;
Lukehart, CM .
CHEMISTRY OF MATERIALS, 2002, 14 (04) :1715-1720
[5]   Sintering behaviour improvement of a low Cr-Mo prealloyed powder steel through Mn additions and others liquid phase promoters [J].
Campos, M ;
Sanchez, D ;
Torralba, JM .
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 2003, 143 :464-469
[6]  
COLMATI F, UNPUB J PHYS CHEM B
[7]   Effect of temperature on the mechanism of ethanol oxidation on carbon supported Pt, PtRu and Pt3Sn electrocatalysts [J].
Colmati, Flavio ;
Antolini, Ermete ;
Gonzalez, Ernesto R. .
JOURNAL OF POWER SOURCES, 2006, 157 (01) :98-103
[8]   Carbon monoxide electro-oxidation properties of carbon-supported PtSn catalysts prepared using surface organometallic chemistry [J].
Crabb, EM ;
Marshall, R ;
Thompsett, D .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2000, 147 (12) :4440-4447
[9]   Enhancement of the electrooxidation of ethanol on a Pt-PEM electrode modified by tin.: Part I:: Half cell study [J].
Delime, F ;
Léger, JM ;
Lamy, C .
JOURNAL OF APPLIED ELECTROCHEMISTRY, 1999, 29 (11) :1249-1254
[10]  
Gonzalez E. R., 1997, Brazilian Patent, Patent No. 00321