离子交换膜中铂沉淀的动力学
The Dynamics of Platinum Precipitation in an Ion Exchange Membrane
摘要：
在燃料电池条件下运行的聚合物电解质膜的显微镜检查已经揭示了膜中明确限定的铂带。在这里，我们提出了一个物理为基础的模型，捕捉铂沉淀在聚合物电解质膜的机制。虽然在整个膜中观察到铂，但铂在铂带处的优先生长取决于膜中的电化学电势分布。在本文中，铂带的位置计算作为在阴极和阳极的气体浓度，气体扩散系数和溶解度常数的膜中，这是相对湿度的函数的气体的浓度的函数。在H2/N2条件下，铂带位于阴极-膜界面附近，随着阴极气流中的氧浓度增加和/或阳极气流中的氢浓度降低，铂带朝向阳极移动。本文建立的模型与铂带位置、铂颗粒分布和尺寸的实验数据一致。
英文摘要：
Microscopy of polymer electrolyte membranes that have undergone operation under fuel cell conditions, have revealed a well defined band of platinum in the membrane. Here, we propose a physics based model that captures the mechanism of platinum precipitation in the polymer electrolyte membrane. While platinum is observed throughout the membrane, the preferential growth of platinum at the band of platinum is dependent on the electrochemical potential distribution in the membrane. In this paper, the location of the platinum band is calculated as a function of the gas concentration at the cathode and anode, gas diffusion coefficients and solubility constants of the gases in the membrane, which are functions of relative humidity. Under H2/N2 conditions the platinum band is located near the cathode-membrane interface, as the oxygen concentration in the cathode gas stream increases and/or the hydrogen concentration in the anode gas stream decreases, the band moves towards the anode. The model developed in this paper agrees with the set of experimental data on the platinum band location and the platinum particle distribution and size.
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