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首页> 外文期刊>Journal of power sources >Evaluation of the catalytic activity of Pd-Ag alloys on ethanol oxidation and oxygen reduction reactions in alkaline medium
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Evaluation of the catalytic activity of Pd-Ag alloys on ethanol oxidation and oxygen reduction reactions in alkaline medium

机译：钯-银合金在碱性介质中对乙醇氧化和氧还原反应的催化活性评估

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摘要

Pd-Ag alloys containing different amounts of Ag (8, 21 and 34at.%) were prepared in order to evaluate their catalytic activity towards the ethanol oxidation (EOR) and oxygen reduction (ORR) reactions. A sequential electroless deposition of Ag and Pd on a stainless steel disc, followed by annealing at 650 ℃ under Ar stream, was used as the alloy electrode deposition process. From half-cell measurements in a 1.0M NaOH electrolyte at S20℃, it was found that alloying Pd with Ag leads to an increases of the ORR and EOR kinetics, relative to Pd. Among the alloys under study, the 21 at.& Ag content alloy presents the highest catalytic activity for the EOR and the lowest Ag content alloy (8at.% Ag) shows the highest ORR activity. Moreover, it was found that the selectivity of Pd-Ag alloys towards ORR is sustained when ethanol is present in the electrolyte.
机译：为了评估其对乙醇氧化（EOR）和氧还原（ORR）反应的催化活性，制备了包含不同数量的Ag（8、21和34at。％）的Pd-Ag合金。在不锈钢圆盘上依次化学沉积Ag和Pd，然后在Ar流下于650℃退火，作为合金电极沉积工艺。通过在S20℃的1.0M NaOH电解质中对半电池进行测量，发现Pd与Ag合金化会导致ORR和EOR动力学相对于Pd增大。在所研究的合金中，21 at。＆Ag含量的合金对EOR表现出最高的催化活性，而Ag含量最低的合金（8at。％Ag）则表现出最高的ORR活性。而且，发现当电解质中存在乙醇时，Pd-Ag合金对ORR的选择性得以维持。

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  • 来源
    《Journal of power sources》 |2011年第15期|p.6092-6098|共7页
  • 作者

    M.C. Oliveira; R. Rego; LS. Fernandes; P.B. Tavares;

  • 作者单位

    CQ.-VR, Centro de Qsiimica - Vila Real. Department of Chemistry. University of Tras-os-MonteseAlto Douro, Apartado 1013.5001-801 Vila Real. Portugal;

    CQ.-VR, Centro de Qsiimica - Vila Real. Department of Chemistry. University of Tras-os-MonteseAlto Douro, Apartado 1013.5001-801 Vila Real. Portugal;

    CQ.-VR, Centro de Qsiimica - Vila Real. Department of Chemistry. University of Tras-os-MonteseAlto Douro, Apartado 1013.5001-801 Vila Real. Portugal;

    CQ.-VR, Centro de Qsiimica - Vila Real. Department of Chemistry. University of Tras-os-MonteseAlto Douro, Apartado 1013.5001-801 Vila Real. Portugal;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ethanol oxidation reaction (eor); pd-ag; pd alloy; oxygen reduction reaction (orr); direct ethanol fuel cell (defc); alkaline medium;

    机译：乙醇氧化反应（eor）;pd-ag;钯合金氧还原反应（orr）;直接乙醇燃料电池（defc）;碱性介质;

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