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The Characteristic Thickness of Polymer Electrolyte Membrane and the Efficiency of Fuel Cell

机译：聚合物电解质膜的特征厚度与燃料电池效率

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A simplified thermodynamic analysis is applied to elucidate the basic feature of fuel cells operation, i.e., the transformation of chemical energy into electricity. To be able to handle this problem analytically we propose a simple model of the chemical reaction kinetics at the electrodes and diffusion in the polymer electrolyte membrane (PEM). The description is based on a set of two mass balance equations involving water and proton transport through the membrane coupled with two reaction equations describing the electrochemical reactions at the electrodes. The transport parameters (water diffusivity, proton conductivity, electro-osmotic drag) involved in the equations for the water and proton flux densities are shown to comply with Onsager reciprocity relations. The resulting form of the transport equations is suitable for a quantitative analysis from the point of view of linear irreversible thermodynamics. In terms of our simplified model, a relation for the characteristic thickness of the PEM is derived that theoretically assures a stable fuel cell operation, and the maximum efficiency of a fuel cell is evaluated, both as functions of the transport properties of the membrane material.
机译：应用简化的热力学分析来阐明燃料电池运行的基本特征，即化学能转化为电能。为了能够分析解决该问题，我们提出了一个简单的电极化学反应动力学模型以及在高分子电解质膜（PEM）中扩散的模型。该描述基于一组涉及水和质子穿过膜的传输的两个质量平衡方程式，以及两个描述电极处电化学反应的反应方程式。水和质子通量密度方程中所涉及的传输参数（水扩散率，质子传导率，电渗阻力）显示符合Onsager互惠关系。从线性不可逆热力学的观点来看，运输方程式的结果形式适合于定量分析。根据我们简化的模型，得出了PEM的特征厚度的关系，该关系在理论上确保了燃料电池的稳定运行，并且评估了燃料电池的最大效率，这两者都是膜材料传输特性的函数。

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