Ethanol electro-oxidation on partially alloyed Pt-Sn-Rh/C catalysts

被引：39
|
作者：
de Souza, Elson A. [1 ]
Giz, M. Janete [2 ]
Camara, Giuseppe A. [2 ]
Antolini, Ermete [3 ]
Passos, Raimundo R. [1 ]
机构：
[1] Univ Fed Amazonas, Dept Quim, Lab Eletroquim & Energia LEEN, BR-69077000 Manaus, Amazonas, Brazil
[2] Inst Chem UFMS, BR-79070900 Campo Grande, MS, Brazil
[3] Scuola Sci Mat, I-16016 Genoa, Italy
来源：
ELECTROCHIMICA ACTA | 2014年 / 147卷
关键词：
Ethanol electro-oxidation; supported catalysts; Pt-Sn-Rh/C; electrocatalysis; in-situ IRRAS; TEMPERATURE FUEL-CELLS; OXIDATION; ELECTROCATALYSTS; PLATINUM; RHODIUM; REDUCTION; METHANOL; SPECTROSCOPY; METAL; ACID;
D O I：
10.1016/j.electacta.2014.09.141
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Ternary Pt-Sn-Rh/C catalysts of Pt:Sn:Rh = 1:0.8:0.2 and 1:1:0.33 atomic ratios were synthesized using the formic acid method and their electrochemical activities were compared for ethanol oxidation with that of binary Pt-Sn/C (1:1) and Pt-Rh/C (1:0.11) catalysts. XRD analysis indicated the presence of Sn in both alloyed and oxide form and suggested the formation of a ternary Pt-Sn-Rh alloy in both catalysts. The particle size by TEM was around 3.5 nm for all catalysts. The efficiency for Pt utilization increased with Rh content. Pt-Sn-Rh/C catalysts exhibited higher catalytic activity for ethanol oxidation than Pt-Rh/C, but lower than Pt-Sn/C. Among ternary catalysts, Pt-Sn-Rh/C (1:0.8:0.2) was the most active. In situ IRRAS showed Rh plays a dual counteracting role during ethanol electro-oxidation on Pt-Sn-Rh/C catalysts, once it promotes C-C bond breaking, thus favouring CO2 formation, but hinders adsorption of ethanol, decreasing the production of acetic acid. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：483 / 489
页数：7
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