Effects of Pt Loading on the Cathode Catalyst Layer During the Cold Start Process

HE Pu; XIA Qiangfeng; JIANG Lixiang; CHEN Li; MU Yutong; HE Peng; TAO Wenquan

doi:10.7652/xjtuxb202311006

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Effects of Pt Loading on the Cathode Catalyst Layer During the Cold Start Process

更新时间：2025-12-08

- Effects of Pt Loading on the Cathode Catalyst Layer During the Cold Start Process
- Vol. 57, Issue 11, Pages: 58-71(2023)
- 作者机构：
  
  1. 西安交通大学能源与动力工程学院,西安,710049
  2. 嘉兴市恒光电力建设有限责任公司,浙江,嘉兴,314000
  3. 西安交通大学人居环境与建筑工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202311006
  CLC： TK91
- Online First：10 November 2023，
  
  Published：2023
- 稿件说明：
移动端阅览
HE Pu, XIA Qiangfeng, JIANG Lixiang, et al. Effects of Pt Loading on the Cathode Catalyst Layer During the Cold Start Process[J]. 2023, 57(11): 58-71.
DOI：

HE Pu, XIA Qiangfeng, JIANG Lixiang, et al. Effects of Pt Loading on the Cathode Catalyst Layer During the Cold Start Process[J]. 2023, 57(11): 58-71. DOI： 10.7652/xjtuxb202311006.

摘要

为进一步探究阴极催化层铂载量对燃料电池低温启动过程中传质反应过程及宏观性能特性的影响机制

建立了质子交换膜燃料电池一维多相非等温非稳态低温启动模型

耦合了考虑氧气在催化层多组分中传质阻力的电化学反应动力学模型

考虑了电池多孔介质内水的输运及相变、电化学反应、电渗拖拽、热量传递等过程

研究了阴极催化层铂载量对低温启动过程中电池性能、水含量、冰的体积分数、电池温度等变化的影响。研究结果表明:过小的铂载量不利于低温启动过程的进行

但过高的铂载量又不利于电池性能的提升

0.1 mg/cm

为最优铂载量; 氧气从催化层孔隙向铂表面进行输运的过程存在时间效应; 随着铂载量的增加

阴极催化层中冰的最初生成时间推迟

冰的生成速率下降; 随着铂载量的增加

阳极催化层和阴极催化层中膜态水含量的分布梯度变小。

Abstract

To investigate the effect of cathode Pt loading on the gas transport and reaction processes

this paper establishes a one-dimensional multiphase non-isothermal non-steady-state cold start model for proton exchange membrane fuel cells. The model is coupled with an electrochemical reaction kinetic model that accounts for the mass transfer resistance of oxygen in the multi-components of the catalyst layer. Additionally

the model considers the water transport

phase change

electrochemical reaction

electro-osmotic drag and heat transfer process. The effects of Pt loading of cathode catalyst layer on the change of performance

water content

ice

volume fraction and temperature are evaluated. The results show that excessively low Pt loading hinders the cold start

while excessively high Pt loading is not conducive to improved performance. A Pt loading of 0.1 mg/cm

is found to be optimal. A time effect is observed during the transportation of oxygen from the catalyst layer pores to the Pt surface. As the Pt loading increases

the initial formation of ice in the cathode catalyst layer is delayed

and the ice formation rate decreases. Higher Pt loading leads to smaller gradients in membrane water content distribution across both the anode and cathode catalyst layers.

关键词

Keywords

references

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