• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>7th international green energy conference amp; 1st DNL conference on clean energy >ELECTROCHEMICALLY DEALLYOED PD-CU CATALYSTS FOR OXYGEN REDUCTION REACTION
【24h】

ELECTROCHEMICALLY DEALLYOED PD-CU CATALYSTS FOR OXYGEN REDUCTION REACTION

机译：电化学脱氧PD-CU催化剂，用于氧还原反应

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

Polymer electrolyte membrane fuel cells (PEMFC) are a promising technology for stationary and portable power applications and have the potential to reduce fossil fuel and greenhouse gas emissions by converting hydrogen and oxygen directly into electricity and water. However, slow kinetics of the oxygen reduction reaction (ORR) on Pt-based catalysts at the cathode limits the efficiency of these fuel cells. This low-efficiency cathode and the requisite high Pt loading (high cost) hinders the widespread application of PEMFCs. This has resulted in research focused on increasing the activity of ORR catalysts and lowering the overall Pt loading or replace Pt with other non-Pt catalysts. In this study, the dealloyed Pd-Cu thin film catalysts (i.e. non-Pt catalysts) were prepared by electrochemical dealloying of Cu-rich Cu3Pd bimetallic precursors. Their catalytic activities for oxygen reduction reaction (ORR) have been investigated in 0.1 mol ·L‐1 HCIO4 . The dealloyed Pd-Cu thin films shows a ~2.0 fold increase in the specific oxygen reduction activity over pure Pd thin films as measured by a rotating disk electrode (RDE). The structures of the dealloyed Pd-Cu catalysts were revealed by synchrotron-based anomalous X-ray diffraction (AXRD) at an atomic scale. The catalytic activity enhancement of the dealloyed Pd-Cu is mainly attributed to the strain change in the Pd overlayer formed on the surface after dealloying. We compare our results on dealloyed Pd-Cu thin films to our previous results on Pt-Cu thin films prepared from dealloying of Cu3Pt precursors. Our results show that the strain is related to the thickness of Pd overlayer, which is affected by the the diffusion coefficient of the constituent element.These studies provide a better understanding of the structure and composition relationships in the materials prepared by dealloying base metal rich alloys.
机译：聚合物电解质膜燃料电池（PEMFC）是用于固定和便携式电源应用的有前途的技术，并且具有通过将氢和氧直接转化为电和水来减少化石燃料和温室气体排放的潜力。然而，在阴极处基于Pt的催化剂上的氧还原反应（ORR）的缓慢动力学限制了这些燃料电池的效率。这种低效率的阴极和所需的高Pt负载（高成本）阻碍了PEMFC的广泛应用。这导致研究集中在增加ORR催化剂的活性和降低总Pt负载或用其他非Pt催化剂代替Pt上。在这项研究中，通过富铜的Cu3Pd双金属前体的电化学脱合金制备了脱合金的Pd-Cu薄膜催化剂（即非Pt催化剂）。在0.1mol·L-1HCIO4中研究了它们对氧还原反应（ORR）的催化活性。通过旋转圆盘电极（RDE）测量，脱合金的Pd-Cu薄膜的比氧还原活性比纯Pd薄膜高约2.0倍。通过基于同步加速器的反常X射线衍射（AXRD）在原子尺度上揭示了脱合金Pd-Cu催化剂的结构。脱合金的Pd-Cu的催化活性增强主要归因于脱合金后在表面上形成的Pd覆盖层中的应变变化。我们将脱合金的Pd-Cu薄膜的结果与先前的由Cu3Pt前体的脱合金制备的Pt-Cu薄膜的结果进行比较。我们的研究结果表明，应变与Pd覆盖层的厚度有关，而Pd覆盖层的厚度受构成元素的扩散系数的影响。这些研究可以更好地了解富合金贱金属合金制备的材料中的结构和组成关系。 。

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