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首页> 外文学位 >Preparation and characterization of platinum/carbon and ruthenium/platinum/carbon nanocatalyst using the novel rotating disk-slurry electrode (RoDSE) technique.
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Preparation and characterization of platinum/carbon and ruthenium/platinum/carbon nanocatalyst using the novel rotating disk-slurry electrode (RoDSE) technique.

机译：使用新型旋转圆盘浆料电极（RoDSE）技术制备和表征铂/碳和钌/铂/碳纳米催化剂。

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摘要

An effort to develop electrochemically smaller and well-dispersed catalytic material on a high surface area carbon material is required for fuel cell applications. In terms of pure metal catalysts, platinum has shown to be the most common catalyst used in fuel cells, but suffers from poisoning when carbon monoxide is strongly adsorbed on its surface when used for direct methanol fuel cell applications. The addition of a metal with the ability to form oxides, such as ruthenium, helps to oxidize the carbon monoxide, freeing the platinum surface for new methanol oxidation. The deposition of catalysts of PtRu onto a carbon support helps to increase the active surface area of the catalyst. Vulcan X is the most commonly used of the amorphous carbon materials for fuel cell applications. Also, a high-surface-area carbon material of interest is carbon nano-onions (CNOs), also known as multilayer fullerenes. The most convenient synthetic method for CNOs is annealing nanodiamond particles, thus retaining the size of the precursors and providing the possibility to prepare very small nanocatalysts using electrochemical techniques.;A rotating disk-slurry electrode (RoDSE) technique was developed as a unique method to electrochemically prepare bulk Pt/Carbon and PtRu/Carbon nanocatalysts avoiding a constant contact of the carbon support to an electrode surface during the electrodeposition process. The nanocatalysts were prepared by using a slurry that was saturated with functionalized Vulcan XC-72R and the metal precursor in sulfuric acid. The electrochemically prepared Pt/C and PtRu/C catalysts were characterized by using TEM, STEM, XRD, XRF, TGA, XPS and electrochemical techniques. A computational analysis also was done.
机译：对于燃料电池应用，需要努力在高表面积碳材料上开发电化学上较小且分散良好的催化材料。就纯金属催化剂而言，铂已被证明是燃料电池中最常用的催化剂，但是当用于直接甲醇燃料电池应用时，当一氧化碳强烈吸附在其表面上时，铂会遭受中毒。添加具有形成氧化物能力的金属（例如钌）有助于氧化一氧化碳，从而释放铂表面以进行新的甲醇氧化。 PtRu催化剂在碳载体上的沉积有助于增加催化剂的活性表面积。 Vulcan X是无定形碳材料在燃料电池应用中最常用的。同样，感兴趣的高表面积碳材料是碳纳米洋葱（CNO），也称为多层富勒烯。用于CNO的最方便的合成方法是对纳米金刚石颗粒进行退火，从而保留了前体的尺寸，并提供了使用电化学技术制备非常小的纳米催化剂的可能性。旋转圆盘浆料电极（RoDSE）技术是一种独特的方法电化学制备块状Pt / Carbon和PtRu / Carbon纳米催化剂，避免了电沉积过程中碳载体与电极表面的恒定接触。通过使用在硫酸中用功能化的Vulcan XC-72R和金属前体饱和的浆液来制备纳米催化剂。通过TEM，STEM，XRD，XRF，TGA，XPS和电化学技术对电化学制备的Pt / C和PtRu / C催化剂进行了表征。还进行了计算分析。

著录项

  • 作者

    Santiago de Jesus, Diana.;

  • 作者单位

    University of Puerto Rico, Rio Piedras (Puerto Rico).;

  • 授予单位 University of Puerto Rico, Rio Piedras (Puerto Rico).;
  • 学科 Chemistry Analytical.;Nanoscience.;Chemistry Inorganic.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 125 p.
  • 总页数 125
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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