Comparison of ethanol electro-oxidation on Pt/C and Pd/C catalysts in alkaline media

被引：205
作者：
Ma, Liang [1 ]
Chu, Deryn [2 ]
Chen, Rongrong [1 ]
机构：
[1] Indiana Univ Purdue Univ, Richard G Lugar Ctr Renewable Energy, Indianapolis, IN 46202 USA
[2] USA, Res Lab, Adelphi, MD 20783 USA
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2012年 / 37卷 / 15期
关键词：
Ethanol electro-oxidation; Alkaline media; Carbon-supported Pt; Carbon-supported Pd; Temperature; Mechanism; ANION-EXCHANGE MEMBRANES; ELECTROLYTE FUEL-CELLS; POLYMER-ELECTROLYTE; ELECTROCATALYTIC OXIDATION; METHANOL ELECTROOXIDATION; ELECTROCHEMICAL-BEHAVIOR; ALCOHOL OXIDATION; MASS-SPECTROMETRY; OXYGEN REDUCTION; PALLADIUM;
D O I：
10.1016/j.ijhydene.2012.04.132
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 ethanol electro-oxidation behaviors of Pt/C and Pd/C in alkaline media were compared using potentiodynamic and potentiostatic methods. Various ethanol and alkaline concentrations were studied. In addition, the temperature effect of ethanol oxidation was investigated. The Pd/C showed a higher activity toward ethanol oxidation than the Pt/C, especially in the potentiostatic measurement. This is mainly due to the higher oxyphilic characteristics of the Pd/C and the relatively inert nature of the Pd/C on C-C bond cleavage. The apparent activation energies of the ethanol oxidation on the Pd/C in alkaline media varied from 26.6 to 30.4 kJ mol(-1), depending on the potentials. The Tafel slopes could be divided into two parts on both catalysts: at low overpotentials, the Tafel slope on both the Pt/C and the Pd/C was close to 120 mV dec(-1) at all temperatures; at high overpotentials, the Tafel slope was ca. 260 mV dec(-1) on the Pd/C at all temperatures, but was much higher on the Pt/C, especially at high temperatures. Based on these results, it is concluded that Pd/C has less poisoning effect and higher activity than Pt/C for selective oxidation of ethanol to acetate. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：11185 / 11194
页数：10
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