On the Influence of Ag on Pd-based Electrocatalyst for Methanol Oxidation in Alkaline Media: A Comparative Differential Electrochemical Mass Spectrometry Study

被引：28
|
作者：
Jurzinsky, Tilman [1 ]
Cremers, Carsten [1 ]
Pinkwart, Karsten [1 ]
Tuebke, Jens [1 ]
机构：
[1] Fraunhofer Inst Chem Technol ICT, Dept Appl Electrochem, Joseph von Fraunhofer Str 7, D-76327 Pfinztal, Germany
来源：
ELECTROCHIMICA ACTA | 2016年 / 199卷
关键词：
DEMS; electrocatalysis; palladium; silver; anion-exchange membrane; fuel cell; CARBON-MONOXIDE; ETHANOL ELECTROOXIDATION; INFRARED-SPECTROSCOPY; AQUEOUS-SOLUTION; SURFACE-AREA; DOUBLE-LAYER; ADSORPTION; PLATINUM; CO; ELECTRODE;
D O I：
10.1016/j.electacta.2016.01.172
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
In this study methanol oxidation in alkaline media was investigated in detail on Pd/C, Ag/C and PdAg/C catalysts. The electrochemical activity towards methanol oxidation reaction, the surface inhibition behavior and the CO2 current efficiency was evaluated for the catalysts by cyclic voltammetry, chronoamperometry, CO adsorbate stripping and CH3OH adsorbate stripping experiments in a differential electrochemical mass spectrometry (DEMS) flow cell setup. PdAg/C catalysts showed higher current densities, lower oxidation onset potentials and lower sensitivity to surface inhibition than Pd/C. Due to detailed studies on the CO2 current efficiencies, side products and adsorbate reactions via DEMS, novel insights into the electrooxidation of methanol on Pd/C and PdAg/C were provided. Even though Ag/C itself was not significantly active for methanol electrooxidation, it was able to promote Pd in its electrochemical activity towards methanol oxidation reaction and selectivity towards production of CO2. Additionally, PdAg/C showed lower sensitivity to catalyst poisoning compared to Pd/C. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：270 / 279
页数：10
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