物理化学学报 >> 2011, Vol. 27 >> Issue (09): 2141-2147.doi: 10.3866/PKU.WHXB20110809

电化学和新能源 上一篇    下一篇

还原热处理条件对Pt-Fe/C 合金催化剂性能的影响

符蓉1,2, 郑俊生1,3, 王喜照1,3, 马建新1,3   

  1. 1. 同济大学(嘉定校区)新能源汽车工程中心, 上海 201804;
    2. 华东理工大学资源与环境工程学院, 上海 200237;
    3. 同济大学(嘉定校区)汽车学院, 上海 201804
  • 收稿日期:2011-04-01 修回日期:2011-05-16 发布日期:2011-08-26
  • 通讯作者: 郑俊生, 马建新 E-mail:jxma@tongji.edu.cn; jszheng@tongji.edu.cn
  • 基金资助:

    国家自然科学基金(21006073)、上海市青年科技启明星计划(11QA1407200)和上海市重点学科(B303)资助项目

Effect of the Reduction Heat-Treatment Condition on the Performance of Pt-Fe/C Alloy Catalyst

FU Rong1,2, ZHENG Jun-Sheng1,3, WANG Xi-Zhao1,3, MA Jian-Xin1,3   

  1. 1. Clean Energy Automotive Engineering Center, Tongji University (Jiading Campus), Shanghai 201804, P. R. China;
    2. School of Resource and Environment Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China;
    3. School of Automotive Studies, Tongji University (Jiading Campus), Shanghai 201804, P. R. China
  • Received:2011-04-01 Revised:2011-05-16 Published:2011-08-26
  • Contact: ZHENG Jun-Sheng, MA Jian-Xin E-mail:jxma@tongji.edu.cn; jszheng@tongji.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21006073), Shanghai Rising-Star Program, China(11QA1407200) and Shanghai Leading Academic Discipline Project, China (B303).

摘要: 采用脉冲微波辅助化学还原-含氢气体热处理法制备了质子交换膜燃料电池(PEMFC)用Pt-Fe/C 合金催化剂. 通过电感耦合等离子体(ICP)检测了金属元素含量, 用透射电镜(TEM)、X射线衍射(XRD)和X射线光电子能谱(XPS)等技术对催化剂的微观结构和形貌进行了表征, 并利用循环伏安(CV)法评价了催化剂催化氧还原性能. 结果表明, 脉冲微波辅助化学还原法是一种快速制备粒径较小、分布均匀的Pt-Fe/C 催化剂的有效方法,含氢气体热处理对提高催化剂活性有重要作用. 还原热处理温度和时间对催化剂活性也有很大影响. 经过500 °C 还原热处理后的催化剂活性比还原热处理之前的催化剂性能有很大提高. TEM 和XRD 结果显示,Pt-Fe/C-500-3h的纳米粒子均匀地分散在碳载体上, 平均粒径为1.8 nm, 500 °C下热处理3 h的催化剂有最大的电化学表面积(ESA), 为55.14 m2·g-1.

关键词: 脉冲微波辅助化学还原, 燃料电池, Pt-Fe/C催化剂

Abstract: Pt-Fe/C catalyst for proton exchange membrane fuel cell (PEMFC) was prepared by a pulse-microwave assisted chemical reduction heat-treatment synthesis method. The elemental content was tested by inductively coupled plasma (ICP). The microstructure and morphology of the as-prepared catalyst were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The electrocatalytic performance was measured by cyclic voltammetry (CV). The results indicate that pulse-microwave assisted chemical reduction heat-treatment synthesis is an efficient method for preparing PEMFC catalysts while the temperature and time of heat treatment greatly affect the size and activity of the Pt-Fe nanoparticles. For a heating temperature of 500 °C and a time of 3 h the Pt-Fe nanoparticles were uniform in size. Moreover, the Pt-Fe/C-500-3h alloy catalyst was highly dispersed on the surface of the carbon support and the TEM and XRD showed that the average Pt-Fe nanoparticle size was 1.8 nm. The electrochemical measurements show that the electrochemical surface area (ESA) of the catalyst was 55.14 m2·g-1.

Key words: Pulse-microwave assisted chemical reduction, Fuel cell, Pt-Fe/C catalyst

MSC2000: 

  • O643