...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of power sources >Rotating disk electrode measurements of activity and stability of monolayer Pt on tungsten carbide disks for oxygen reduction reaction
【24h】

Rotating disk electrode measurements of activity and stability of monolayer Pt on tungsten carbide disks for oxygen reduction reaction

机译：旋转圆盘电极测量碳化钨圆盘上单层Pt的氧还原反应的活性和稳定性

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In the current study, rotating disk electrode measurements were performed to gain insight into the oxygen reduction reaction (ORR) performance of Pt supported on single-phase tungsten monocarbide (WC) substrates. Using well-defined WC disks with precise Pt depositions, the interaction between Pt and WC can be studied during the ORR without any additional complexities, such as support effects and uncertainties regarding the direct contact of Pt with WC. Furthermore, XPS is used to determine the surface concentration and oxidation state of WC and Pt before and after ORR measurements, showing how the catalyst is affected during the ORR. The monolayer Pt on WC system shows smaller than expected activities compared to bulk Pt. The cause for the depressed activity is attributed to the formation of tungsten oxides under excess oxygen and high oxidizing potentials during the ORR. The presence of tungsten oxides are confirmed by XPS, and its effect on the stability of the monolayer Pt and WC system is further demonstrated with voltammetric results. These results clarify some unresolved issues with the current literature regarding the synergistic effect between Pt and WC in the ORR.
机译：在当前研究中，进行了转盘电极测量，以深入了解单相碳化钨（WC）衬底上负载的Pt的氧还原反应（ORR）性能。使用具有精确Pt沉积的轮廓分明的WC磁盘，可以在ORR期间研究Pt和WC之间的相互作用，而不会产生任何其他复杂性，例如支撑效应和Pt与WC直接接触的不确定性。此外，在ORR测量之前和之后，使用XPS来确定WC和Pt的表面浓度和氧化态，从而显示催化剂在ORR期间如何受到影响。与本体Pt相比，WC系统上的单层Pt表现出的活性小于预期。活性降低的原因归因于在ORR期间在过量氧气和高氧化电势下形成钨氧化物。 XPS证实了氧化钨的存在，并通过伏安法结果进一步证明了其对单层Pt和WC系统稳定性的影响。这些结果澄清了有关ORR中Pt和WC之间协同效应的当前文献中一些未解决的问题。

著录项

  • 来源
    《Journal of power sources》 |2012年第1期|p.46-52|共7页
  • 作者

    IreneJ. Hsu; Yannick C. Kimmel; Yu Dai; Shengli Chen; JingguangG.Chen;

  • 作者单位

    Department of Chemical Engineering, University of Delaware, Newark, DE 19716, United States;

    Department of Chemical Engineering, University of Delaware, Newark, DE 19716, United States;

    Hubei Key Laboratory of Electrochemical Power Sources, Department of Chemistry, Wuhan University, Wuhan 430072, China;

    Hubei Key Laboratory of Electrochemical Power Sources, Department of Chemistry, Wuhan University, Wuhan 430072, China;

    Department of Chemical Engineering, University of Delaware, Newark, DE 19716, United States;

  • 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

    platinum; tungsten carbide; oxygen reduction reaction; tungsten oxidation; rotating disk electrode measurements;

    机译：铂;碳化钨氧还原反应;钨氧化转盘电极测量;

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