物理化学学报 >> 2015, Vol. 31 >> Issue (12): 2316-2323.doi: 10.3866/PKU.WHXB201510221

电化学和新能源 上一篇    下一篇

基于微观格点模型模拟PEMFC定向结构催化层

张洁婧1,2,*(),王宇新2,张建峰1,许莉2   

  1. 1 吉林农业大学生命科学学院,吉林省秸秆综合利用技术创新平台,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:2015-08-27 发布日期:2015-12-04
  • 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);长春市科技局(2013173)

Simulation of Orientated Catalyst Layer in PEMFC Using a Microstructure Lattice Model

Jie-Jing. ZHANG1,2,*(),Yu-Xin. WANG2,Jian-Feng. ZHANG1,Li. XU2   

  1. 1 School of Life Sciences, Jilin Agricultural University, Jilin Province Innovation Platform of Straw Comprehensive Utilization Technology, 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:2015-08-27 Published:2015-12-04
  • Contact: Jie-Jing. ZHANG E-mail:zjjx124@163.com
  • Supported by:
    the National Natural Science Foundation of China(20606025);Jilin Agricultural University, China(201409);Changchun Administration of Science & Technology, China(2013173)

摘要:

用微观格点模型对质子交换膜燃料电池(PEMFC)定向结构阴极性能进行了模拟,并与随机结构电极进行了对比,研究了催化剂利用率及电池性能的变化.计算了催化层内的传递和电化学反应,研究了质子、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、离子电势和电化学反应速率的分布,证明了Pt/C颗粒在电极厚度方向上定向排布有利于提高电池性能.另外,研究了电极厚度对定向结构电极性能的影响,发现与随机结构电极不同,定向结构电极厚度越小,高电流密度下电极性能越好.

关键词: 定向电极, 微观结构, 格点模型, 催化剂利用率, Pt/C颗粒定向排列

Abstract:

The orientated cathode in a proton exchange membrane fuel cell was simulated and compared with a random cathode using a microstructure lattice model. The differences between catalyst utilization and electrode performance were studied. Transport and electrochemical reactions in the model catalyst layer were calculated. The orientated cathode performed better than the traditional random cathode and was explained by variations of the oxygen levels, the over potential and the reaction rate across the catalyst layer with cell current density. Additionally, we examined the electrode performance at different thicknesses. Unlike the traditional random cathode, a thinner orientated cathode performed better.

Key words: Orientated electrode, Microstructure, Lattice model, Catalyst utilization, Pt/C particle configuration

MSC2000: 

  • O646