首页> 外文期刊>Analytical chemistry >Evaluation of Alkylamine Modified Pt Nanoparticles as Oxygen Reduction Reaction Electrocatalyst for Fuel Cells via Electrochemical Impedance Spectroscopy
【24h】

Evaluation of Alkylamine Modified Pt Nanoparticles as Oxygen Reduction Reaction Electrocatalyst for Fuel Cells via Electrochemical Impedance Spectroscopy

机译:通过电化学阻抗光谱法评价烷基胺改性Pt纳米粒子作为燃料电池氧还原反应电催化剂

获取原文
获取原文并翻译 | 示例
           

摘要

Organically (octyl amine, OA) surface modified electrocatalyst (OA-Pt/CB) was studied for its oxygen reduction reaction (ORR) activity via dc methods and its charge and mass transfer properties were studied via electrochemical impedance spectroscopy (EIS). Comparison with a commercial catalyst (TEC10V30E) with similar Pt content was also carried out. In EIS, both the catalysts showed a single time-constant with an emerging high-frequency semicircle of very small diameter which was fitted using suitable equivalent circuits. The organically modified catalyst showed lower charge-transfer resistance and hence, low polarization resistance in high potential region as compared to the commercial catalyst. The dominance of kinetic processes was observed at 0.925–1.000 V, whereas domination of diffusion based processes was observed at lower potential region for the organic catalyst. No effect due to the presence of carbon was observed in the EIS spectra. Using the hydrodynamic method, higher current penetration depth was obtained for the organically modified catalyst at 1600 rpm. Exchange current density and Tafel slopes for both the electrocatalysts were calculated from the polarization resistance obtained from EIS which was in correlation with the results obtained from dc methods.
机译:有机(Octyl胺,OA)表面改性电催化剂(OA-Pt / Cb)是通过DC方法进行氧还原反应(ORR)活性,通过电化学阻抗光谱(EI)研究其电荷和传质性能。还进行了与具有相似Pt含量的商业催化剂(TEC10V30E)的比较。在EIS中,两种催化剂都显示出单个时间常数,其具有非常小直径的出现的高频半圆,其使用合适的等效电路装配。与商业催化剂相比,有机改性的催化剂显示出较低的电荷转移性,因此在高潜在区域中的低偏振电阻。在0.925-1.000V中观察到动力学过程的优势,而在有机催化剂的较低潜在区域下观察到扩散基础的方法。在EIS光谱中观察到由于存在碳的存在而没有效果。使用流体动力学方法,获得较高电流的渗透深度以1600rpm的有机改性催化剂获得。从与从DC方法获得的结果相关的EIS获得的偏振电阻,计算两个电流密度和Tafel斜率。

著录项

  • 来源
    《Analytical chemistry》 |2018年第10期|共8页
  • 作者单位

    Department of Engineering Graduate School of Integrated Science and Technology Shizuoka University Shizuoka 432-8561 Japan;

    Department of Engineering Graduate School of Integrated Science and Technology Shizuoka University Shizuoka 432-8561 Japan;

    Department of Engineering Graduate School of Integrated Science and Technology Shizuoka University Shizuoka 432-8561 Japan;

    Department of Environmental Engineering and Green Technology Malaysia?Japan International Institute of Technology University Technology Malaysia 54100 Kuala Lumpur Malaysia;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 分析化学;
  • 关键词

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