本文選題：固體氧化物燃料電池　切入點：COMSOL　出處：《華中科技大學》2015年碩士論文　論文類型：學位論文

【摘要】：固體氧化物燃料電池(SOFC)由于它的高效率、很強的燃料靈活性和環(huán)境友好等優(yōu)點是未來能源市場上很有前景的能量轉(zhuǎn)化裝置,但是目前它還存在很多的不足,阻礙了其更廣泛的應用。因此,為了提高固體氧化物燃料電池的性能及競爭力,研究人員采取了各種方法從各個方面進行嘗試。本論文中將建立模型對平板式固體氧化物燃料電池進行數(shù)值模擬,并嘗試從優(yōu)化陽極和電解質(zhì)界面的角度提高SOFC的電化學性能。本文的模擬工具是有限元軟件COMSOL,文中利用它分別成功地對含有較厚和較薄電解質(zhì)層的SOFC陽極-電解質(zhì)-陰極重復單元進行了二維穩(wěn)態(tài)下的數(shù)學建模,模型的等式略有不同,但都以氫氣為燃料氣體并考慮了電池內(nèi)部的電荷,氣體傳輸定律和電化學反應過程。在先一個模型中,文中建模測試了五種具有不同陽極/電解質(zhì)界面的電池,以找出具有最佳電化學性能的陽極/電解質(zhì)界面電池。結果顯示較深橢圓型的界面在不同的固定電壓下比其他四種界面電池獲得更高的電流密度,對其進一步的優(yōu)化研究發(fā)現(xiàn),此橢圓形態(tài)在陽極/電解質(zhì)界面處越深、越密集,電池總的性能表現(xiàn)就越好,和平面界面電池比較,理想下能獲得最大32%的電流密度的提升。利用第二個模型本文著重研究了陽極支撐型SOFC中矩形的電極和電解質(zhì)界面對單電池性能的影響,模擬得到了電池內(nèi)部的氣體、電子離子電勢、活化過電勢等的分布,發(fā)現(xiàn)參數(shù)gap厚度為100μm的矩形界面單電池電流電壓曲線明顯優(yōu)于平面界面電池,其最大功率密度提升可以達到48%,并具體分析了較高的矩形界面對電池性能提升作用的原因,提出了影響此提升的因素,同時與實驗數(shù)據(jù)的比對還驗證了此模擬的可靠性。本論文提出了固體氧化物燃料電池中界面曲折因子的概念,并驗證了其與電池電化學性能之間的正相關關系,對未來從燃料電池電解質(zhì)/電極界面角度優(yōu)化燃料電池的性能的提供了很好的方向。
[Abstract]:Solid oxide fuel cell (SOFC) is a promising energy conversion device in the energy market in the future due to its high efficiency, strong fuel flexibility and environmental friendliness, but it still has many shortcomings. Thus, in order to improve the performance and competitiveness of solid oxide fuel cells, In this paper, a model is built to simulate the solid oxide fuel cell (SOFC). In this paper, the finite element software COMSOL is used to improve the electrochemical performance of SOFC from the point of view of optimizing the interface between anode and electrolyte. In this paper, the SOFC anode electrolysis with thicker and thinner electrolyte layers is successfully carried out by using the finite element software COMSOL. Two dimensional steady state mathematical model of mass-cathode repeat unit is presented. The equation for the model is slightly different, but both use hydrogen as the fuel gas and take into account the charge, the law of gas transfer and the electrochemical reaction process inside the cell. In this paper, five kinds of batteries with different anode / electrolyte interfaces are modeled and tested. In order to find out the anode / electrolyte interface battery with the best electrochemical performance, the results show that the deep elliptical interface obtains higher current density than the other four interface cells at different fixed voltages. The deeper and denser this ellipse is at the anode / electrolyte interface, the better the overall performance of the battery is, compared with the planar interface battery. In this paper, the effect of the rectangular electrode and electrolyte interface on the performance of a single cell in anodic supported SOFC is studied, and the gas inside the cell is simulated. The distribution of electron ion potential, activation overpotential and so on shows that the current and voltage curves of rectangular interface cells with the thickness of 100 渭 m gap are obviously superior to those of planar interface cells. The maximum power density can be increased to 48. The reason of the effect of the high rectangular interface on the battery performance is analyzed, and the factors that affect the performance of the battery are put forward. In this paper, the concept of interface zigzag factor in solid oxide fuel cell (SOFC) is proposed, and the positive correlation between it and the electrochemical performance of SOFC is verified. It provides a good direction for optimizing the performance of fuel cell from the point of view of electrolyte / electrode interface.
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM911.4

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