Solid oxide fuel cell cathode diffusion polarization: materials and exergy study

Zouhri Khalid; Shinneeb Monsif; Chikhalsouk Molham; Cress Jacob

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Solid oxide fuel cell cathode diffusion polarization: materials and exergy study

机译：固体氧化物燃料电池阴极扩散极化：材料和漏洞研究

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The efficiency of the solid oxide fuel cell (SOFC) still can be enhanced by decreasing the cathode diffusion polarization, however to resolve this problem, band gap materials engineering analysis for the SOFC cathode must be well-thought-out. In this research, we investigated theoretically and analytically the effect of several materials constraints and functional conditions on the air electrode diffusion polarization and its influence on exergy efficiency of the fuel cell. The novel model of this paper is the second part of the model created on the SOFC to investigate the polarization on the electrodes and electrolyte. The model is divided into a number of units axially; for each unit, the thermal equations and the continuity equations of the electrochemical reactions are progressively solved with an iterative approach. The partial differential equations for mass and energy transfer through the cathode were spatially discretized using the finite differences method (FDM). The results shows that in order to maintain the peak exergy efficiency of the SOFCs in applied application environments, it is suggested to have the SOFC air cathode porosity between 0.35 and 0.38, the cathode pore mean radius in the range of 0.00015 to 0.0002 cm, the cathode material tortuosity of 2.9, the SOFC functional temperature between 850 degrees C and 950 degrees C, the thickness of the air electrode between 0.01 and 0.02 cm, and have the operating pressure in the range of 3 and 5 bar.

机译：通过降低阴极扩散偏振，可以提高固体氧化物燃料电池（SOFC）的效率，但是为了解决这个问题，SOFC阴极的带隙材料工程分析必须是近来的考虑。在这项研究中，理论上，从理论上和分析地研究了几种材料限制和功能条件对空气电极扩散偏振的影响及其对燃料电池的电解效率的影响。本文的新模型是在SOFC上产生的模型的第二部分，以研究电极和电解质上的极化。该模型轴向分为多个单位;对于每个单元，通过迭代方法逐步解决电化学反应的热方程和连续等式。使用阴极的质量和能量传递通过阴极的部分微分方程使用有限差异法（FDM）来分离地分离。结果表明，为了保持应用的应用环境中SOFC的峰值高度效率，建议在0.35和0.38之间的SOFC空气阴极孔隙率，阴极孔平均半径在0.00015至0.0002cm的范围内，阴极材料曲折为2.9，SOFC功能温度在850℃和950℃之间，空气电极的厚度在0.01和0.02cm之间，并且具有3和5巴的工作压力。

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来源
《Energy Conversion & Management》 |2021年第3期|113865.1-113865.14|共14页
作者
Zouhri Khalid; Shinneeb Monsif; Chikhalsouk Molham; Cress Jacob;
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作者单位

Univ Dayton Dept Engn Management Syst & Technol 300 Coll Pk Kettering Lab 241M Dayton OH 45469 USA;

Higher Coll Technol Dept Mech Engn Abu Dhabi U Arab Emirates;

Higher Coll Technol Dept Mech Engn Abu Dhabi U Arab Emirates;

Univ Dayton Dept Engn Management Syst & Technol 300 Coll Pk Kettering Lab 241M Dayton OH 45469 USA;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
Exergy; Efficiency; Porosity; Tortuosity; Diffusion;

机译：deergy;效率;孔隙度;曲折;扩散;

Solid oxide fuel cell cathode diffusion polarization: materials and exergy study

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