Promoting effect of CeO2 in the electrocatalytic activity of rhodium for ethanol electro-oxidation

被引：43
作者：
He, Q. [2 ]
Mukerjee, S. [2 ]
Shyam, B. [3 ]
Ramaker, D. [3 ]
Parres-Esclapez, S. [1 ]
Illan-Gomez, M. J. [1 ]
Bueno-Lopez, A. [1 ]
机构：
[1] Univ Alicante, Dept Inorgan Chem, E-03080 Alicante, Spain
[2] Northeastern Univ, Dept Chem & Chem Biol, Boston, MA 02115 USA
[3] George Washington Univ, Dept Chem, Washington, DC 20052 USA
来源：
JOURNAL OF POWER SOURCES | 2009年 / 193卷 / 02期
关键词：
Ethanol electro-oxidation; Electrocatalyst; Ceria; Rhodium; DAFC; DEFC; CATALYSTS; METHANOL; SURFACE; OXIDATION; DECOMPOSITION; OXIDES; RH;
D O I：
10.1016/j.jpowsour.2009.03.056
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：
The promoting effect of ceria in the electrocatalytic activity of rhodium for ethanol electro-oxidation in alkali media has been studied. Rh/C, CeO2/C and RhCeO2/C catalysts were synthesized and characterized by TEM, XRD, XPS, TG-MS, H-2-TPR and XAS. The electrocatalytic activity was studied by Cyclic Voltammetry (CV) and chronoamperometry. The onset potential of oxidation on RhCeO2/C Was shifted negatively as compared to that on Rh/C, despite ceria itself does not show any electrocatalytic activity. The promoting effect of ceria has been attributed to the improved rhodium dispersion, and differences in the oxidation state of rhodium between Rh/C and RhCeO2/C were not found. The carbon support reduces rhodium species to Rh-0, and also partially reduces ceria, during the samples preparation, and the surface of the carbon support is oxidised. (c) 2009 Elsevier B.V. All rights reserved.
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页码：408 / 415
页数：8
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