本文選題：陽(yáng)極支撐氧化物燃料電池 + 微觀形貌��； 參考：《西北工業(yè)大學(xué)》2014年博士論文

【摘要】：燃料電池SOFC是一種在恒定工作溫度下將儲(chǔ)存在燃料中的化學(xué)能直接轉(zhuǎn)化為電能的轉(zhuǎn)化系統(tǒng)。和傳統(tǒng)的熱電轉(zhuǎn)化系統(tǒng)相比，該系統(tǒng)是直接從化學(xué)能到電能轉(zhuǎn)化過(guò)程，同時(shí)轉(zhuǎn)化過(guò)程中氣體污染物的排放量很低，接近于零排放，是一種高效清潔的能量轉(zhuǎn)換系統(tǒng)。因此陽(yáng)極支撐氧化物燃料電池工作過(guò)程中還原氧化過(guò)程的相關(guān)研究是一個(gè)亟待解決的重要科學(xué)和技術(shù)研究課題�；诖耍撐脑趪�(guó)家自然基金項(xiàng)目“長(zhǎng)壽命能量轉(zhuǎn)換多層膜系結(jié)構(gòu)失效模式與表征方法研究”的資助下，研究了陽(yáng)極支撐氧化物燃料電池的性能，對(duì)燃料電池的運(yùn)行過(guò)程中的結(jié)構(gòu)形貌變化，還原過(guò)程曲線，結(jié)構(gòu)殘余應(yīng)力變化等進(jìn)行了測(cè)試，深入探討了陽(yáng)極支撐固體氧化物燃料電池運(yùn)行過(guò)程中變化規(guī)律。論文的主要工作如下： （1）論文首先測(cè)試了燃料電池陽(yáng)極完全還原過(guò)程曲線，得到了不同還原時(shí)間和不同還原溫度陽(yáng)極層還原過(guò)程變化規(guī)律；并模擬分析了反應(yīng)過(guò)程中熱流場(chǎng)環(huán)境，實(shí)現(xiàn)了還原氧化反應(yīng)過(guò)程中溫度控制和流量控制，對(duì)燃料電池進(jìn)行熱力學(xué)描述，并設(shè)計(jì)了試驗(yàn)反應(yīng)過(guò)程和還原氧化反應(yīng)試驗(yàn)的操作流程。 （2）論文研究發(fā)現(xiàn)了不同氧化還原時(shí)間與溫度下陽(yáng)極支撐氧化物燃料電池殘余應(yīng)力的變化規(guī)律，發(fā)現(xiàn)殘余應(yīng)力隨還原程度增加而下降，，給出了曲線下降規(guī)律，分析了殘余應(yīng)力對(duì)電解質(zhì)膜屈服強(qiáng)度等相關(guān)力學(xué)性能的影響，分析了發(fā)生塑性變形和開裂的原因。 （3）論文研究了陽(yáng)極支撐氧化物燃料電池半電池電解質(zhì)層、界面層、陽(yáng)極層在還原過(guò)程和還原再氧化過(guò)程的微觀形貌，進(jìn)行了結(jié)構(gòu)表征，對(duì)比了反應(yīng)前后微觀形貌、能譜變化。 （4）論文測(cè)試了陽(yáng)極支撐氧化物燃料電池電解質(zhì)層的熱膨脹系數(shù)及應(yīng)力應(yīng)變，研究了半電池的還原及再氧化的熱膨脹性能。 論文研究對(duì)于燃料電池的運(yùn)行和工藝改進(jìn)具有理論意義和工程實(shí)用價(jià)值。
[Abstract]:Fuel cell SOFC is a conversion system that converts the chemical energy stored in the fuel into electric energy at a constant operating temperature. Compared with the traditional thermoelectric conversion system, this system is a kind of efficient and clean energy conversion system, which is a direct conversion process from chemical energy to electric energy. At the same time, the emission of gas pollutants in the conversion process is very low, close to zero emission. Therefore, the research on the reduction and oxidation process of anodic supported oxide fuel cells is an important scientific and technical research topic to be solved urgently. Based on this, the performance of anodic supported oxide fuel cell (OFC) is studied under the National Natural Fund project "study on failure modes and characterization methods of long Life Energy conversion Multilayer system". The changes of structure morphology, reduction curve and structural residual stress during the operation of the fuel cell were measured, and the variation law of the anode supported solid oxide fuel cell during the operation was discussed. The main work of the thesis is as follows: Firstly, the anodic complete reduction process curve of fuel cell is measured, and the variation law of anodic layer reduction process at different reduction time and temperature is obtained, and the heat flow field in the reaction process is simulated and analyzed. The temperature control and flow rate control in the process of reducing and redox reaction were realized, the thermodynamic description of fuel cell was carried out, and the experimental reaction process and the operation flow of reduction and oxidation reaction test were designed. 2) the variation of residual stress of anodic supported oxide fuel cell at different redox time and temperature is found. The residual stress decreases with the increase of reduction degree, and the curve decline rule is given. The influence of residual stress on the yield strength of electrolyte membrane was analyzed and the causes of plastic deformation and cracking were analyzed. In this paper, the microstructure of electrolyte layer, interface layer and anode layer of anode supported oxide fuel cell (OFC) during reduction and reoxidation were studied. The microstructure of the electrolyte layer and the energy spectrum before and after the reaction were compared. The thermal expansion coefficient and stress strain of anodic supported oxide fuel cell electrolyte layer were measured. The research in this paper has theoretical significance and practical value for fuel cell operation and process improvement.
【學(xué)位授予單位】：西北工業(yè)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM911.4

【參考文獻(xiàn)】

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