固体氧化物燃料电池阳极微结构三维数值模拟  

Three-dimensional Numerical Simulation of Solid Oxide Fuel Cell Anode Microstructure

作　　者：李强强 薛顶喜 马帅 张兄文[1] 李国君[1] LI Qiangqiang;XUE Dingxi;MA Shuai;ZHANG Xiongwen;LI Guojun(MOE Key Laboratory of Thermo-Fluid Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学热流科学与工程教育部重点实验室,西安710049

出　　处：《工程热物理学报》2023年第5期1309-1315,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.52176201)。

摘　　要：固体氧化物燃料电池(SOFC)是一种清洁高效的发电设备,其电极微结构直接影响电池的电化学性能。本文通过X-ray技术获取了SOFC阳极微结构,将电荷和物质传导定义在体相材料,将电化学反应定义在三相边界线上,建立了SOFC阳极电化学-传质耦合的三维微观模型,对比了两个微结构在80℃条件下的极化特性。研究表明微结构对电极内部物理场分布有极大影响,越靠近电极电解质界面,活化极化和离子电势波动越强烈。电极孔隙相细小的喉附近存在较大传质阻力,形成明显浓度极化跳跃。活化极化和欧姆极化大小相当,各占据总损失的45%以上。本文模型可用于研究微结构改变引起的电池退化和电极的优化设计。Solid oxide fuel cell(SOFC)is a clean and efficient power generation device,whose electrode microstructure directly affects the electrochemical performance of the cell.In this paper,we obtained the SOFC anode microstructure by X-ray technique,defined the charge and matter conduction in the bulk phase material and the electrochemical reaction in the three-phase boundary line,established a three-dimensional microscopic model of the electrochemical-mass transfer coupling of the SOFC anode,and compared the polarization characteristics of the two microstructures at 800℃.It is shown that the microstructure has a great influence on the physical field distribution inside the electrode,and the closer to the electrolyte interface of the electrode,the stronger the activation polarization and ionic potential fluctuations.A large mass transfer resistance exists near the throat of the fine electrode pore phase,forming a significant concentration polarization jump.Activation polarization and ohmic polarization are comparable in size,each occupying more than 45% of the total losses.The model in this paper can be used to study the cell degradation caused by microstructural changes and the optimal design of electrodes.

关 键 词：固体氧化物燃料电池 阳极 微结构 数值模拟 

分 类 号：TM911.4[电气工程—电力电子与电力传动]