MCFC阴极中的传质现象
Mass Transport Phenomena in a MCFC Cathode
摘要：
熔融碳酸盐燃料电池（MCFC）是一种以天然气为燃料、采用熔盐电解质的电化学能量转换技术。为了保持电解质处于这种状态，电池必须保持在500 ℃以上的温度，从而消除了对贵金属作为催化剂的需要。对该设备内部的传输过程进行建模的研究数量有限，主要是由于其对移动应用的适用性有限。在这项工作中，三个一维模型的MCFC阴极的不同类型的扩散和对流的基础上。模型之间进行比较，以评估其有效性。关于离子传输，它示出，存在一个限制的情况下，离子迁移跨阴极，取决于电导率的液体电位。最后，在阴极上的扩散率的优化进行了尝试，以增加电池的性能和寿命。
英文摘要：
A molten carbonate fuel cell (MCFC) is an electro-chemical energy conversion technology that runs on natural gas and employs a molten salt electrolyte. In order to keep the electrolyte in this state, the cell must be kept at a temperature above 500 C, eliminating the need for precious metals as the catalyst. There has been only a limited amount of research on modelling the transport processes inside this device, mainly due to its restricted applicability for mobile applications. In this work, three one-dimensional models of a MCFC cathode are presented based on different types of diffusion and convection. Comparisons between models are performed so as to assess their validity. Regarding ion transport, it is shown that there exists a limiting case for ion migration across the cathode that depends on the conductivity for the liquid potential. Finally, an optimization of the diffusivity across the cathode is carried out in an attempt to increase the cell performance and its longevity.
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