The performance of direct internal reforming solid oxide fuel cells (DIR-SOFCs) depends on the coupling of multiphysics field and electrode microstructure. This study develops a heterogeneous model for a DIR-SOFC anode based on a microstructure reconstructed using X-ray. The control equations are accurately defined at the corresponding geometry characteristic in accordance with the actual physical phenomena. The distributions of activation overpotential and molar fractions of substances are investigated. The effects of total overpotential, prereforming extent, and operating temperature are discussed. Electrochemistry reaction rate is faster than reforming reaction rate and is fluctuating at a microscale. Total overpotential has an insignificant effect on CH₄ conversion rate, but operating temperature has a significant effect on CH₄ conversion rate and electrical performance of cell. Higher prereforming extent of methane is beneficial for elevating electrical performance. The present model is beneficial for the study on the relationship between the microstructure and cell performance.

直接内部重整固体氧化物燃料电池（DIR-SOFC）的性能取决于多物理场与电极微结构的耦合。这项研究基于使用X射线重建的微观结构，开发了DIR-SOFC阳极的异质模型。根据实际的物理现象，在相应的几何特性下精确地定义了控制方程。研究了物质的活化超电势和摩尔分数的分布。讨论了总超电势，预改革程度和工作温度的影响。电化学反应速率比重整反应速率快，并且在微尺度上波动。总超电势对CH _4的影响很小转化率，但工作温度对电池的CH ₄转化率和电性能有显着影响。甲烷的较高的预重整程度有利于提高电性能。该模型对于研究微观结构与电池性能之间的关系是有益的。