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Advanced nanomaterials for fuel cell catalysts: Characterization of bimetallic nanoparticles.

机译：用于燃料电池催化剂的先进纳米材料：双金属纳米颗粒的表征。

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摘要

This thesis describes the results of the characterization of bimetallic gold-platinum nanoparticles, which are potential useful catalysts for fuel cell application. The correlation between the electrocatalytic activity and the bimetallic composition of carbon-supported gold-platinum (AuPt/C) nanoparticles (2-4 nm diameters) is investigated for the methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR). The electrocatalytic activities were characterized using cyclic voltammetric and rotating disk electrode techniques, and were also compared with those obtained with Au/C and Pt/C catalysts under the same measurement conditions. The mass activities of the bimetallic catalysts were shown to be not only dependent on the composition, but also the nature of the electrolyte. The bimetallic catalysts with 60∼85% Au were found to exhibit maximum electrocatalytic activities for MOR and ORR in the alkaline electrolytes. The catalysts showed a relatively smooth transition from the low activity of Au to the high activity of Pt in the acidic electrolyte. This remarkable finding suggests a qualitative concurrence with findings from related theoretical modeling and experimental studies, which are discussed in terms of a synergistic activity by the participation of Au in the adsorption of carbon monoxide or oxygenated intermediated species in the MOR or ORR reactions.
机译：本论文描述了双金属金-铂纳米颗粒的表征结果，双金属金-铂纳米颗粒是燃料电池应用中潜在的有用催化剂。研究了甲醇氧化反应（MOR）和氧还原反应（ORR）的电催化活性与碳负载金-铂（AuPt / C）纳米粒子（直径2-4 nm）的双金属成分之间的相关性。使用循环伏安法和转盘电极技术对电催化活性进行了表征，并与在相同测量条件下用Au / C和Pt / C催化剂获得的电催化活性进行了比较。已显示双金属催化剂的质量活性不仅取决于组成，而且还取决于电解质的性质。发现具有60〜85％Au的双金属催化剂对碱性电解质中的MOR和ORR具有最大的电催化活性。在酸性电解质中，催化剂显示出从Au的低活性到Pt的高活性的相对平滑的过渡。这一显着发现表明，与相关理论模型和实验研究的结果在质量上是一致的，它们是通过Au在MOR或ORR反应中参与一氧化碳或含氧中间体的吸附而产生的协同活性而进行讨论的。

著录项

  • 作者

    Lin, Yan.;

  • 作者单位

    State University of New York at Binghamton.;

  • 授予单位 State University of New York at Binghamton.;
  • 学科 Chemistry Analytical.; Chemistry Physical.
  • 学位 M.Mat.S.E.
  • 年度 2006
  • 页码 63 p.
  • 总页数 63
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;物理化学（理论化学）、化学物理学;
  • 关键词

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