摘要
固体氧化物燃料电池(Solid Oxide Fuel Cell, SOFC)是一种高效利用氢能的新型绿色能源技术,应用范围广泛,有利于转变我国的能源结构。对于平板式阳极支撑型SOFC,梯度阳极设计被认为是一种有望提高其综合性能的重要结构。本文针对梯度组分阳极SOFC开展数值研究,通过建立等温工况下三维多物理场耦合模型,模拟了SOFC内部的气体传输现象与电化学反应过程,通过对比梯度组分阳极SOFC与均质组分阳极SOFC的传质特性与电性能,深入分析了梯度组分阳极对SOFC性能的影响机理,揭示了梯度组分阳极设计的优越性。研究发现,在均质组分阳极SOFC中,随着电子导体体积分数的增加,阳极流道和多孔阳极中的氢气摩尔分数增大,梯度组分阳极设计的SOFC中氢气摩尔分数分布较高,有效提高了多孔阳极的传质性能;相较于均质组分阳极SOFC,梯度组分阳极设计在减小活化极化损失和欧姆极化损失方面不具有明显的优势,但可以显著减少浓度极化损失,降低阳极的总极化损失;在本文的模型中,梯度组分阳极设计SOFC的最大输出功率密度为1.24 W·cm^(-2),相较于阳极电子导体体积分数为0.65、0.50和0.40的均质组分阳极SOFC,增幅分别为28.40%、9.13%和10.68%,梯度组分阳极设计可以显著提高SOFC的电性能。本研究可为SOFC梯度阳极组分的优化设计提供理论指导依据。
Solid oxide fuel cell(SOFC)is an innovative green energy technology.It efficiently uses hydrogen energy and has a wide range of applications,which helps transform China's energy structure.For planar anode-supported SOFCs,the gradient anode design is considered to be an important structural feature that can enhance the overall performance.This study numerically in-vestigates the gradient composition anode SOFC.Under isothermal conditions,three-dimensional multi-physics coupling models are established.These models simulate the gas transport and electro-chemical reaction processes in the SOFC.By comparing the mass transfer and electrical performance of homogeneous composition anode and gradient composition anode SOFCs,this study analyzes the influence mechanism of gradient composition anodes on SOFC performance.This analysis reveals the superiority of the gradient composition anode design.It is found that in the homogeneous composition anode SOFCs,as the volume fraction of electronic conductor increases,the hydrogen mole fraction in the anode channels and porous anodes increases.The hydrogen mole fraction distribution in the gradient composition anode is higher than that in the homogeneous composi-tion anode.This indicates that the gradient composition anode can effectively improve the cell's mass transfer performance.Compared with homogeneous composition anode SOFCs,the gradient composition anode SOFC doesn't show significant advantages in reducing activation polarization and ohmic polarization losses.However,it can significantly reduce the concentration polarization losses,thus lowering the total polarization loss of the SOFC anode.In this study,the maximum output power density of the gradient composition anode SOFC can reach 1.24 W·cm^(-2),which is 28.40%,9.13%,and 10.68%higher than that of the homogeneous composition anode SOFCs with electronic conductor volume fractions of 0.65,0.50,and 0.40 respectively.Evidently,the gradient composition anode design can significantly improve the electrical performance of SOFC.This research can provide theoretical guidance for the optimization design of gradient anode compositions in SOFCs.
作者
付佩
曹自强
陈颖
谢洋
刘青山
陈轶嵩
FU Pei;CAO Ziqiang;CHEN Ying;XIE Yang;LIU Qingshan;CHEN Yisong(School of Automobile,Chang'an University,Xi'an 710064,China;Army Military Transportation University,Bengbu 23301l,China)
出处
《工程热物理学报》
北大核心
2025年第8期2520-2531,共12页
Journal of Engineering Thermophysics
基金
国家自然科学基金青年基金(No.52306068,No.52302427)
陕西省自然科学基础研究计划项目(No.2023-JC-QN-0464)。
关键词
固体氧化物燃料电池
梯度组分阳极
传质与电性能
多物理场耦合
数值模拟
solid oxide fuel cell
gradient composition anode
mass transfer and electrical perfor-mance
multi-physics coupling
numerical simulation
