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EIS analysis of oxygen reduction reaction of Pt supported on different substrates

机译:负载在不同基质上的Pt的氧还原反应的EIS分析

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摘要

We investigated the kinetic and the mechanism of the oxygen reduction reaction (ORR) on Pt supported on two substrates (TiO2-C and SnO2-C) at different potentials. The platinum nanoparticles were synthesized by photo-reduction method. The morphology, size and composition of electrocatalysts were investigated through TEM and EDS analysis. The electrochemical properties of the materials were evaluated by cyclic voltammetry, linear sweep voltammetry and AC impedance spectroscopy. Electrochemical results were compared with Pt/C Etek commercial sample tested at same conditions. The Tafel slope values showed that the first electron transfer is the rate determining step. Pt/oxide-C samples show an improvement in the ORR catalytic activity compared to Pt/C Etek. The presence of oxide modifies the electronic properties of Pt related to a strong metal substrate interaction. Two electric circuits were proposed to describe the impedance study of the ORR mechanism associated with at least the presence of two-electron reaction process involved. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
机译:我们研究了在两种电位(TiO2-C和SnO2-C)上负载的Pt上氧还原反应(ORR)的动力学和机理。通过光还原法合成铂纳米颗粒。通过TEM和EDS分析研究了电催化剂的形态,大小和组成。通过循环伏安法,线性扫描伏安法和交流阻抗谱法评估了材料的电化学性能。将电化学结果与在相同条件下测试的Pt / C Etek商业样品进行比较。 Tafel斜率值表明第一次电子转移是速率确定步骤。与Pt / C Etek相比,Pt /氧化物C样品显示ORR催化活性得到改善。氧化物的存在会改变Pt的电子特性,而Pt的电子特性与强金属基材相互作用有关。提出了两个电路来描述与至少存在的双电子反应过程有关的ORR机制的阻抗研究。 (C)2017氢能出版物有限公司。由Elsevier Ltd.出版。保留所有权利。

著录项

  • 来源
    《International journal of hydrogen energy》 |2017年第51期|30364-30373|共10页
  • 作者单位

    Univ Guanajuato, Div Ciencias Nat & Exactas, Dept Ingn Quim, Noria Alta S-N, Guanajuato 36050, Gto, Mexico;

    Univ Guanajuato, Dept Ingn Minas Met & Geol, Ex Hda De San Matias S-N Col San Javier, Guanajuato 36050, Gto, Mexico;

    Univ Guanajuato, Div Ciencias Nat & Exactas, Dept Ingn Quim, Noria Alta S-N, Guanajuato 36050, Gto, Mexico;

    Univ Guanajuato, Div Ciencias Nat & Exactas, Dept Ingn Quim, Noria Alta S-N, Guanajuato 36050, Gto, Mexico;

    Univ Guanajuato, Dept Ingn Geomat & Hidraul, Juarez 77 Col Ctr, Guanajuato 36000, Gto, Mexico;

  • 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

    EIS; Nanoparticles; Oxygen reduction mechanism; Fuel cells;

    机译:EIS;纳米颗粒;减氧机理;燃料电池;

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