...
首页> 外文期刊>Electrocatalysis >Site Blocking with Gold Adatoms as an Approach to Study Structural Effects in Electrocatalysis
【24h】

Site Blocking with Gold Adatoms as an Approach to Study Structural Effects in Electrocatalysis

机译:金吸附原子位阻作为研究电催化结构效应的一种方法

获取原文
获取原文并翻译 | 示例
           

摘要

In this paper, we apply the site blocking approach for studying structural effects in electrocatalysis. We utilize gold as a site blocking element and investigate the CO monolayer oxidation as a model structure-sensitive surface reaction on nanostructured electrodes prepared by Pt electrodeposition. The evolution of the hydrogen UPD with the gold coverage suggests that Au adatoms sequentially block (100) terraces and steps, then (110) steps, and finally (111) facets. This leads to a systematic shift of the CO-stripping peaks towards positive potentials. Investigation of the carbon monoxide dosing in situ with infrared spectroscopy provides information on the influence of Au adatoms on the formation of COads adlayers. We conclude that an exceptionally high activity of nanostructured Pt electrodes prepared by electrodeposition results from the presence of low-coordinated defect sites which are presumably located at the emergence of grain boundaries at the surface. These defects on the one hand serve as active sites for the formation of active oxygen-containing adsorbates, and on the other hand prevent formation of densely packed CO islands.
机译:在本文中,我们将位阻方法用于研究电催化中的结构效应。我们利用金作为位阻元素,并研究了CO单层氧化作为对Pt电沉积制备的纳米结构电极的模型结构敏感的表面反应。氢UPD随金的覆盖而演变,表明金原子吸附原子依次阻塞了(100)台阶和台阶,然后是(110)台阶,最后是(111)刻面。这导致CO汽提峰向正电势的系统转移。一氧化碳的原位红外光谱研究提供了有关金原子对COads沉积物形成的影响的信息。我们得出的结论是,通过电沉积制备的纳米结构Pt电极具有异常高的活性,这是由于存在低配位缺陷位点所致,这些位点可能位于表面晶界的出现处。这些缺陷一方面用作形成活性含氧吸附物的活性位点,另一方面防止形成密集堆积的CO岛。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号