PEMFC阴极催化层的LBM模拟

摘要

采用格子-Boltzmann方法(LBM)直接从介观层次数值模拟了质子交换膜燃料电池(PEMFC)阴极催化层的传质和电化学反应过程.开发了二维程序;为了验证所编程序的正确性,建立了一个理想的二维规则模型,模拟得到的极化曲线和已有文献的极化曲线吻合较好.处理PEMFC阴极催化层的电镜扫描图得到了二维实际计算模型,应用LBM模拟得到了二维的O_2浓度和电势分布.表明LBM是一有效的分析PEMFC阴极催化层中传递和电化学反应过程的数值模拟方法.%In this work, the Lattice Boltzmann Method (LBM) was applied to the simulation of mass transport and electrochemical reaction in a proton exchange membrane fuel cell (PEMFC) cathode catalyst layer. 2 D program was developed and then an idealized 2 D regular model was established to validate the program. Polarization curves from simulation show a good agreement with the results from literature. Then, LBM was applied directly on a 2 D practical microstructure established from SEM image of a PEMFC cathode catalyst layer. 2 D distribution of oxygen concentration and potential was obtained. From the results of this simulation the LBM can be considered as a promising numerical scheme to analyze mass transport and electrochemical reaction in PEMFC cathode catalyst layer.