基于分数布朗运动模型的阳极微结构对 SOFC 中传质和电化学反应影响的研究

IF 2.6 4区 化学 Q3 ELECTROCHEMISTRY
Yongqi Wei, Zhi Ning, Chunhua Sun, Ming Lv, Yechang Liu, Lintao Wang, Shuaijun Wang
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引用次数: 0

摘要

多孔阳极的微观结构在固体氧化物燃料电池(SOFC)的传质动力学和电化学反应中起着至关重要的作用,对其性能有重大影响。本文研究了多孔阳极的微观结构对 SOFCs 传质和电化学反应的影响,解决了微观结构建模复杂导致研究匮乏的问题,为 SOFCs 的结构优化提供了支持性信息。首先,对微结构的构建和传质模拟进行了理论推导。随后,建立了基于分数布朗运动(FBM)模型的构造模型,以获得不同的微结构,包括各种流动孔隙结构、三相边界(TPB)结构和入口结构。通过有限差分晶格玻尔兹曼法(LBM)建立传质模型,预测气体摩尔分数分布,并计算不同微结构的浓度过势。最后,通过深入的实验分析了结构参数对传质和电化学反应的影响。以氢-蒸汽-氮气(H2-H2O-N2)三元传质为例,对比结果表明,复杂的流孔结构既增加了传质距离,也增加了传质阻力。为了提高 SOFC 的性能,降低流孔复杂程度和增加 TPB 长度都能减轻浓度极化的影响。此外,入口结构的改变对传质和电化学反应的影响很小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Research on effect of anode microstructures on mass transfer and electrochemical reaction in SOFCs based on a fractional Brownian motion model

Research on effect of anode microstructures on mass transfer and electrochemical reaction in SOFCs based on a fractional Brownian motion model

The microstructure of the porous anode plays a crucial role in the mass transfer dynamics and electrochemical reaction of solid oxide fuel cells (SOFCs), significantly impacting their performance. This paper investigates the effect of microstructure of the porous anode on mass transfer and electrochemical reaction in SOFCs, which addresses the scarcity of research due to the complexity of microstructure modeling, offering supportive information for the structure optimization of SOFCs. Firstly, theoretical deductions of constructing microstructure and simulating mass transfer are conducted. Subsequently, a construction model is established based on the fractional Brownian motion (FBM) model to obtain different microstructures, encompassing various flow pore structures, triple phase boundary (TPB) structures, and inlet structures. Through a finite difference lattice Boltzmann method (LBM), the mass transfer is modeled to predict gas molar fraction distributions and calculate concentration overpotentials with different microstructures. Finally, thorough experiments are carried out to analyze the effect of structural parameters on mass transfer and electrochemical reaction. Taking the hydrogen-steam-nitrogen (H2-H2O-N2) ternary mass transfer as an example, the comparison results indicate that complex flow pore structures increase both the distance and resistance of mass transfer. To improve the performance of SOFCs, reducing flow pore complexity and increasing TPB length both mitigate the effect of concentration polarization. Moreover, the change of inlet structure suggests minimal impact on mass transfer and electrochemical reaction.

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来源期刊
CiteScore
4.80
自引率
4.00%
发文量
227
审稿时长
4.1 months
期刊介绍: The Journal of Solid State Electrochemistry is devoted to all aspects of solid-state chemistry and solid-state physics in electrochemistry. The Journal of Solid State Electrochemistry publishes papers on all aspects of electrochemistry of solid compounds, including experimental and theoretical, basic and applied work. It equally publishes papers on the thermodynamics and kinetics of electrochemical reactions if at least one actively participating phase is solid. Also of interest are articles on the transport of ions and electrons in solids whenever these processes are relevant to electrochemical reactions and on the use of solid-state electrochemical reactions in the analysis of solids and their surfaces. The journal covers solid-state electrochemistry and focusses on the following fields: mechanisms of solid-state electrochemical reactions, semiconductor electrochemistry, electrochemical batteries, accumulators and fuel cells, electrochemical mineral leaching, galvanic metal plating, electrochemical potential memory devices, solid-state electrochemical sensors, ion and electron transport in solid materials and polymers, electrocatalysis, photoelectrochemistry, corrosion of solid materials, solid-state electroanalysis, electrochemical machining of materials, electrochromism and electrochromic devices, new electrochemical solid-state synthesis. The Journal of Solid State Electrochemistry makes the professional in research and industry aware of this swift progress and its importance for future developments and success in the above-mentioned fields.
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