论文标题
在聚合物电解质燃料电池中对PT氧化和溶解的电压循环条件的研究
Study of voltage cycling conditions on Pt oxidation and dissolution in polymer electrolyte fuel cells
论文作者
论文摘要
本文致力于研究在各种工作条件下，在各种工作条件下，在不同的电势差（也称为电压）中，PT催化剂在加速应力测试中应用的循环。铂的降解是相对于Pt离子溶解的降解和一维模型描述的催化剂的Pt氧化物覆盖率。在模型中，降解速率随温度和PT纳米颗粒的颗粒直径降低而增加。通过分析方法提出了基础扩散系统对基本扩散系统的理论研究，并通过ODE系统的第一个积分提供了明确的解决方案。使用二阶隐式解释方案获得数值测试。计算机模拟表明，催化剂的寿命取决于电压轮廓和上电势水平。通过这种PT，膜表面的质量损失比在气体扩散层上更为重要。
This paper is devoted to study the electrochemical behavior of Pt catalyst in a polymer electrolyte fuel cell at various operating conditions and at different electric potential difference (also known as voltage) cycling applied in accelerated stress tests. The degradation of platinum is considered with respect to the Pt ion dissolution and the Pt oxide coverage of catalyst described by a one-dimensional model. In the model, degradation rate increases with temperature and decreasing particle diameter of Pt nano-particles. The theoretical study of the underlying diffusion system with the nonlinear reactions is presented by analytical methods and gives explicit solutions through a first integral of the ODE system. Numerical tests are obtained using a second order implicit-explicit scheme. The computer simulation shows that the lifetime of the catalyst depends on the voltage profile and the upper potential level. By this Pt mass loss is more significant at the membrane surface than at the gas diffusion layer.
