Performance analysis of the ordered and the conventional catalyst layers in proton exchange membrane fuel cells
Performance analysis of the ordered and the conventional catalyst layers in proton exchange membrane fuel cells
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质子交换膜燃料电池有序催化剂层和常规催化剂层的性能分析
DOI：
10.1016/j.electacta.2006.01.047
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发表时间：
2006-06
影响因子：
6.6
通讯作者：
X.Q. Cheng
中科院分区：
文献类型：
--
作者：
G.P. Yin;P.F. Shi;T. Yang;C.Y. Du;X.Q. Cheng
本文比较了质子交换膜燃料电池阴极活性层的两种稳态一维模型，即具有团簇结构的常规活性层模型和有序活性层模型。模型方程考虑了氧还原反应、质子迁移和氧在聚合物电解质和气孔中的扩散的塔菲尔动力学。用有序有源层模拟的极化曲线预测，即使铂含量较低，其性能也优于常规有源层模型。对过电位贡献的分析表明，有序催化剂层的良好性能可归因于浓度极化的减少。模拟结果还表明，有序活性层的氧浓度和过电位分布更均匀，而传统催化剂层的局部电流源分布更均匀。本研究结果对实际燃料电池的设计有一定的指导意义。
Two steady-state, one-dimensional models of the cathode active layer for the proton exchange membrane fuel cell, a conventional active layer model with the agglomerate structure and an ordered active layer model, have been compared. The model equations account for the Tafel kinetics of oxygen reduction reaction, proton migration and oxygen diffusion in the polymer electrolyte and gas pores. The polarization curves simulated by the ordered active layer predict a superior performance than the conventional active layer model even with lower platinum loadings. Analysis of the overpotential contributions indicates that the better performance of the ordered catalyst layer can be attributed to the reduction of concentration polarization. Simulation results also reveal that the ordered active layer gives more uniform oxygen concentration and overpotential distributions while the conventional catalyst layer shows more evenly distributed local current source. The present results will be helpful for practical fuel cell designs.
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