固体氧化物燃料电池在气流模式与气流速度耦合作用下的电化学特性
Electrochemical properties of solid oxide fuel cells under the coupling effect of airflow pattern and airflow velocity
AI总结：
本研究建立SOFC三维多场耦合模型，揭示了气流模式、流速与工作电压的耦合对电池电化学性能的影响规律，为SOFC高效设计与商业化应用提供了理论指导。
摘要：
在全球能源格局深度调整和环境问题严峻挑战的双重背景下，固体氧化物燃料电池（SOFC）因其众多优异特性成为高效清洁能源转换技术研究的焦点。SOFC的电化学性能受气体流动模式（并流、逆流、交叉流）、流速（阴极和阳极通道气体）以及工作电压等多种因素影响。准确分析各项电化学指标随各因素的变化规律，是提出电池高效反应设计方案的基础。因此，本研究建立了SOFC的三维多场耦合模型，并设置了涵盖电化学、气体流动、物质扩散等内容的模型参数与边界条件，以研究各因素间耦合作用对电池电化学性能的影响。结果表明，随着工作电压降低，电池电化学反应速率显著加快，气体摩尔分数梯度增大，电解质电流密度分布的不均匀性增强。在低压工作条件下，交叉流流动模式展现出更优的电化学性能优势，其功率密度曲线在不同电流密度区间均处于领先。随着流道气体流速增加，电池输出功率密度曲线总体呈上升趋势，随后由于阴极反应趋于饱和，流速增加对功率密度提升的驱动作用逐渐减弱。本研究揭示了流动模式、流速与电压的耦合对SOFC电化学性能的影响，为SOFC的商业化应用提供了指导。
英文摘要：
Under the dual background of deep adjustment of global energy pattern and severe challenges of environmental problems, solid oxide fuel cell (SOFC) has become the focus of research on efficient and clean energy conversion technology due to its many excellent characteristics. The electrochemical performance of SOFC is affected by various factors such as gas flow pattern (co-flow, counter-flow, cross-flow), flow rate (cathode and anode channel gases), and operating voltage. Accurately analysing the variation of electrochemical indexes with each factor is the basis for proposing the design scheme of high efficiency reaction of the cell. Therefore, a three-dimensional multi-field coupling model of SOFC is established in this study, and the model parameters and boundary conditions covering electrochemistry, gas flow, substance diffusion, etc. are set to study the influence of the coupling between factors on the electrochemical performance of the cell. These results show that with the decrease of operating voltage, the electrochemical reaction rate of the cell increases significantly, the gas mole fraction gradient increases, and the inhomogeneity of the electrolyte current density distribution is enhanced. Under low-voltage operating conditions, the cross-flow flow pattern shows better electrochemical performance advantages, and its power density profile takes the lead in different current density intervals. With the increase of the flow rate of the flow channel gas, the output power density curve of the cell shows an overall upward trend, and then the driving effect of the flow rate increase on the power density increase is gradually weakened due to the saturated cathodic reaction. This study reveals the influence of the coupling of flow pattern, flow rate and voltage on the electrochemical performance of SOFC, and provides guidance for the commercial application of SOFC.
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