多孔性
材料科学
固体氧化物燃料电池
电极
电解
多物理
阳极
复合材料
电解质
化学
热力学
物理
有限元法
物理化学
作者
Zhu Zhou,Xing Lü,V. Venkatesan,Haoran Xu,Wenhua Chen,Jin Xuan
出处
期刊:Fuel Cells
[Wiley]
日期:2022-11-04
卷期号:23 (1): 119-134
被引量:1
标识
DOI:10.1002/fuce.202200151
摘要
Abstract A comprehensive multiphysics 3D model of an anode‐supported planar reversible solid oxide cell (rSOC) with a half‐channel‐unit‐cell geometry is created and validated. The physical phenomena that are modeled include reversible electrochemistry/charge transport, coupled with momentum/mass/heat transport. Several electrode microstructures comprising the homogeneous and functionally graded porosity distributions are applied to the validated model, to evaluate and compare the current‐voltage (j‐V) performance in both fuel cell mode and electrolysis mode. The results indicate that increasing the porosity in a homogeneous porous electrode does not always promote the cell's j‐V performance. An optimal porosity emerges where the effect of porosity on the mass transport is maximized, which ranges between 0.5 and 0.7 in the working conditions of the present study. Compared with homogeneous porous electrodes, the heterogeneous porous electrode design with a functionally graded porosity distribution is found to be a potential option to better the overall j‐V performance of the rSOC. Furthermore, it is discovered that theoretically grading the porosity in the width direction (i.e., increasing porosity from the center of each gas channel to the center of each adjacent rib) brings an outsize benefit on the cell's performance, compared to the traditional way of improving the porosity along the cell thickness direction.
科研通智能强力驱动
Strongly Powered by AbleSci AI