摘要
本文基于电-化-热多场耦合理论,通过有限元方法建立了一个基于对称双阴极结构SOFC电堆单元的三维数值模型,研究了其电堆内部的电流密度分布和温度分布.研究结果表明,气体流动方式以及集流方式影响了电解质上电流密度和温度分布:在气体进、出气口处有较大的电流密度分布;在气体共流模式下,电解质层温度分布却较均匀;在双阴极结构电池阴极侧的单一集流模式下,集流侧的电解质的平均电流密度高于另一侧.
Solid oxide fuel cell(SOFC)is a high-efficient clean conversion device for future energy management.Because of the low antioxidant reduction ability and complex thermal stress,the structure of traditional asymmetrical thin anode-supported planar SOFC is easily to be broken under stack operating conditions.To overcome these defects,a new complete symmetrical SOFC based on double-sided cathodes was developed.To study the influences of gas flow direction and current collection mode on the cell performance inside stack,a numerical model was established by finite element method based on the theory of electro-thermo-chemo multiphysical coupling.By applying this model,the molar fraction of gas components,current density distribution and temperature distribution in the co-flow side and the counter flow side inside a stack are calculated,and the influences of the cathodic flow mode on the gas components and cell performance are discussed.In addition,the current distribution of the cell under the unilateral current collection mode is simulated,and its effect on the cell performance inside a stack is analyzed.The results show that the current density and temperature distribution on the electrolyte are affected by the flow direction and the current collection model.Large current density distributions are observed at gas inlet and outlet.The temperature distribution on the electrolyte layer under the co-flow model is more uniform than that under the counter flow direction.The average current density on the current collecting side is higher than that on the other side under the single current collection mode.It is also found that the current density and temperature distribution on the electrolyte layer can be effectively improved by reducing the resistance of cathodic cover plate.Moreover,the current collecting position will affect the path of electrons.Thus,optimization of the current collecting position can also contribute to improve the cell output performance inside a stack.This work provides a reference for improving the
作者
俞成荣
朱建国
蒋聪盈
谷宇晨
周晔欣
李卓斌
邬荣敏
仲政
官万兵
YU Cheng-rong;ZHU Jian-guo;JIANG Cong-ying;GU Yu-chen;ZHOU Ye-xin;LI Zhuo-bin;WU Rong-min;ZHONG Zheng;GUAN Wan-bing(Faculty of Civil Engineering and Mechanics,Jiangsu University,Zhenjiang 212013,China;Ningbo Institute of Material Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China;School of Aerospace Engineering and Applied Mechanics,Tongji University,Shanghai 200092,China;School of Science,Harbin Institute of Technology,Shenzhen 518055,China;Zhejiang Energy Technology Research Institute Company Co.Ltd,Hangzhou 311121,China)
出处
《电化学》
CAS
CSCD
北大核心
2020年第6期789-796,共8页
Journal of Electrochemistry
基金
国家重点研究开发项目(No.2018YFB1502600)
国家自然科学基金重点项目(No.11932005)
宁波市重大攻关项目(No.2018B10048)
浙江省能源集团有限公司科技项目(No.ZNKJ-2018-008)资助。
关键词
对称双阴极
固体氧化物燃料电池
多场耦合
共流与逆流
集流
double-sided cathodes
solid oxide fuel cell
multi-physics coupled
co-flow and counter flow
current collection
