• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nanotechnology >Highly methanol-tolerant platinum electrocatalyst derived from poly (vinylpoyrrolidone) coating
【24h】

Highly methanol-tolerant platinum electrocatalyst derived from poly (vinylpoyrrolidone) coating

机译：高度甲醇耐受铂电催化剂衍生自聚（乙烯基丙酮）涂层

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

The design and fabrication of a methanol-tolerant electrocatalyst is still one of the most important issues in direct methanol fuel cells (DMFCs). Here, we focus on the design of a cathodic electrocatalyst in DMFCs and describe a new methanol-tolerant electrocatalyst fabricated from poly(vinylpyrrolidone) (PVP) coating on platinum nanoparticles assisted by hydrogen bonding between PVP and polybenzimidazole (PBI). The PVP layer has a negligible effect on the oxygen reduction reaction (ORR) activity, while the methanol oxidation reaction is retarded by the PVP layer. The PVP-coated electrocatalyst shows higher ORR activity under various methanol concentrations in the electrolyte, suggesting that the PVP-coated electrocatalyst has a higher methanol tolerance. Also, the PVP-coated electrocatalyst loses only 14% of the electrochemical surface area after 5000 potential cycles from 0.6-1.0 V versus the reversible hydrogen electrode, indicating better Pt stability than non-coated (27%) and commercial (38%) electrocatalysts due to the unique sandwich structure formed by the PVP and PBI. The power density of the PVP-coated electrocatalyst is four to five times higher compared to non-coated and commercial electrocatalysts with 12M methanol feeding to the anode side, respectively. PVP coating is important for the enhancement of Pt stability and methanol tolerance. This study offers a new method for preparing a low-cost and high-methanol-tolerant Pt electrocatalyst, and useful information for real DMFC application to eliminate the methanol crossover problem in the cathode side.
机译：甲醇耐性电催化剂的设计和制备仍然是直接甲醇燃料电池（DMFC）中最重要的问题之一。在此，我们专注于DMFC中的阴极电催化剂的设计，并描述由PVP和聚苯哌唑（PBI）之间的铂纳米颗粒的聚（乙烯基吡咯烷酮）（PVP）涂层制成的新的甲醇耐受电催化剂。 PVP层对氧还原反应（ORR）活性具有可忽略不计的影响，而PVP层仍延迟甲醇氧化反应。 PVP涂覆的电催化剂在电解质中的各种甲醇浓度下显示出更高的ORR活性，表明PVP涂覆的电催化剂具有更高的甲醇耐受性。此外，PVP涂覆的电催化剂在从0.6-1.0V的潜在循环与可逆氢电极的5000个电位循环后失去了14％的电化学表面积，表明比未涂覆（27％）和商业（38％）电催化剂更好的Pt稳定性由于PVP和PBI形成了独特的三明治结构。与具有12M甲醇进料到阳极侧的未涂覆和商业电催化剂相比，PVP涂覆电催化剂的功率密度分别比具有12M甲醇的非涂覆和商业电催化剂更高的4至5倍。 PVP涂层对于增强Pt稳定性和甲醇耐受性很重要。该研究提供了一种制备低成本和高甲醇耐受PT电催化剂的新方法，以及真实DMFC应用的有用信息，以消除阴极侧的甲醇交叉问题。

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