【摘要】 为探究高温工作状态下的电池内部运行情况，对固体氧化物燃料电池（SOFC）电化学性能及传热传质分布情况进行有效分析，利用COMSOL Multiphysics软件，结合电池内气体扩散、浓物质传递、热量传递和电极中二次电流密度构建多物理场模型，研究了NH₃-SOFC中的传热传质、化学和电化学反应特性。结果表明：燃料为氨气时，提高电池工作温度有利于提高电池输出功率，当1 073.2 K工作温度继续提高时，最大功率和电流密度增长速度降低；NH₃-SOFC与H₂-SOFC输出性能相近。进一步探究了温度和反应物进气摩尔分数对NH₃-SOFC性能影响。发现入口氨气摩尔分数自0.7提升至1时，电池性能得到明显提高；而氧气摩尔分数高于0.2时，其对电池性能影响较小，空气可作为电池阴极气体使用。更多还原

【Abstract】 Though using COMSOL Multiphysics, incorporating gas diffusion, transport of concentrated species and heat transfer of the cell with secondary current density′s physical field of electrodes to construct multiphysics model, the electrochemical performance and distribution of heat and mass transfer of solid oxide fuel cell（SOFC） was analyzed to research the internal operation of cells under high temperature and heat and mass transfer, chemical and electrochemical reaction properties in NH₃-SOFC. The result shows that when fuels are ammonia, the higher the operating temperature of cell, the greater the output power. While keeping on increasing 1 073.2 K, the growth rates of maximum power and current density decrease, lowering temperature′s influence to cells performance. The output performance of NH₃-SOFC and H₂-SOFC is similar. How intake gas molar fraction of reagents affects the performance of NH₃-SOFC was further studied. Increasing mole fraction of ammonia at the inlet from 0.7 to 1 could effectively improve cells performance. While molar fraction of oxygen above 0.2 had less effect on batteries′ performance, and air could be used as the cathode gas of cell.更多还原