物理化学学报 >> 2015, Vol. 31 >> Issue (3): 489-497.doi: 10.3866/PKU.WHXB201501221

电化学和新能源 上一篇    下一篇

基于新球型微观结构模型模拟PEMFC催化层

张洁婧1,2, 王宇新2, 许莉2   

  1. 1. 吉林农业大学生命科学学院, 长春 130118;
    2. 天津大学化工学院, 化学工程联合国家重点实验室, 天津 300072
  • 收稿日期:2014-11-04 修回日期:2015-01-22 发布日期:2015-03-06
  • 通讯作者: 张洁婧 E-mail:zjjx124@163.com
  • 基金资助:

    国家自然科学基金(20606025), 吉林农业大学科研启动基金(201409)及长春市科技局(2013173)资助项目

Simulation of Sphere-Microstructure Model of the Catalyst Layer in a PEMFC

ZHANG Jie-Jing1,2, WANG Yu-Xin2, XU Li2   

  1. 1. School of Life Sciences, Jilin Agricultural University, Changchun 130118, P. R. China;
    2. State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China
  • Received:2014-11-04 Revised:2015-01-22 Published:2015-03-06
  • Contact: ZHANG Jie-Jing E-mail:zjjx124@163.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20606025), Jilin Agricultural University, China (201409), and Changchun Administration of Science & Technology, China (2013173).

摘要:

建立了一个新球型催化层微观结构模型, 并基于此模型对质子交换膜燃料电池(PEMFC)性能进行了模拟. 该模型中假设催化层由Pt/C 颗粒和离子聚合物-孔混合相组成. 假设Pt/C 颗粒为球形结构, 其直径符合正态分布, 用不同直径的球来表示随机分散在电极中的Pt/C 颗粒. 计算了催化层内的传递和电化学反应, 研究了质子和氧气及电化学反应速率在电极厚度方向上的分布, 并且通过对比氧气浓度、过电位和电化学反应速率的分布、极化曲线及催化剂利用率等证明了适当的电极厚度与Pt/C颗粒粒径有利于提高电池性能.

关键词: 超薄电极, 球型微观模型, Pt/C颗粒粒径, 电极厚度, 催化剂利用率

Abstract:

The catalyst layer in a proton-exchange-membrane fuel cell (PEMFC) was simulated based on a sphere-microstructure model that consisted of Pt/C particles and a mixed ionomer-pore phase. Pt/C particles were randomly distributed in the model and were treated as spheres with a normal distribution of their size assumed. Transport and electrochemical reactions in the model catalyst layer were calculated. The variation of oxygen level, overpotential, reaction rate, and cell current through the catalyst layer was discussed in relation to changes in electrode thickness and Pt/C particle size. The corresponding polarization curves were also analyzed. Through this analysis, optimal values for electrode thickness and particle size were achieved.

Key words: Ultrathin electrode, Sphere microstructure model, Pt/C particle size, Electrode thickness, Catalyst utilization

MSC2000: 

  • O646