直接甲醇液流燃料电池的二维两相模型

A Two-Dimensional Two-Phase Model for Direct Methanol Redox Fuel Cell

直接甲醇燃料电池(DMFC)的阴极水淹、甲醇渗透及贵金属催化剂的成本问题是DMFC商业化的主要障碍。直接甲醇液流燃料电池(DMRFC)使用Fe^(3+)/Fe^(2+)氧化还原电对取代DMFC阴极,克服了阴极的水淹、甲醇渗透和电池成本等问题。使用Comsol Multiphysics4.2a模拟软件,建立了一个DMRFC二维两相模型来预测电池性能,模拟结果显示增加阳极催化层厚度、减少阳极扩散层厚度和提高Fe^(3+)浓度有利于提高电池的性能,但当阳极催化层厚度和甲醇浓度分别大于5×10^(-5)m和1.41 mol/L时,电池性能并不能显著提高。

The cathode flooding problem and the methanol crossover effect,together with the cost and availability of precious-metal catalyst,are major obstacles for the commercialization of direct methanol fuel cell(DMFC) technologies. The direct methanol redox fuel cell(DMRFC) cathode employs a liquidbased Fe^(3+)/Fe^(2 +)redox couple which avoids the effect of fuel crossover,cathode flooding and reduces the total platinum group metal content. A two-dimensional two-phase model for DMRFC has been developed to predict the performance of the cell by using simulation software of Comsol Multiphysics4. 2a. The results show that increasing the thickness of anode catalyst layer,decreasing the thickness of anode diffusion layer and increasing Fe^(3+)concentration will improve the performance of DMRFC. However,when increasing the thickness of anode catalyst layer above 5 × 10^(- 5)m and the concentration of Fe^(3+)higher than 1. 41 mol/L,the performance of DMRFC is hardly improved.