Influence of adsorbed carbon dioxide on hydrogen electrosorption in palladium-platinum-rhodium alloys

被引：29
作者：
Lukaszewski, M
Grdén, M
Czerwinski, A
机构：
[1] Univ Warsaw, Dept Chem, PL-02093 Warsaw, Poland
[2] Ind Chem Res Inst, PL-01793 Warsaw, Poland
来源：
ELECTROCHIMICA ACTA | 2004年 / 49卷 / 19期
关键词：
noble metal alloys; carbon dioxide reduction; hydrogen adsorption; hydrogen absorption; cyclic voltammetry;
D O I：
10.1016/j.electacta.2004.02.029
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Carbon dioxide electroreduction was applied to examine the processes of hydrogen electrosorption (adsorption, absorption and desorption) by thin electrodeposits of Pd-Pt-Rh alloys under conditions of cyclic voltammetric (CV) experiments. Due to different adsorption characteristics towards the adsorption product of the electroreduction of CO2 (reduced CO2) exhibited by the alloy components hydrogen adsorption and hydrogen absorption signals can be distinguished on CV curves. Reduced CO2 causes partial blocking of hydrogen adsorbed on surface Pt and Rh atoms, without any significant effect on hydrogen absorption into alloy. It reflects the fact that adsorbed hydrogen bonded to Pd atoms does not participate in CO2 reduction, while hydrogen adsorbed on Pt and Rh surface sites is inactive in the absorption reaction. In contrast, CO is adsorbed on all alloy components and causes a marked inhibition of hydrogen sorption (both adsorption and absorption)/desorption reactions. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码：3161 / 3167
页数：7
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