本文關(guān)鍵詞：固體氧化物燃料電池一些關(guān)鍵材料的性能研究　出處：《華南理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 固體氧化物燃料電池 LSM LSGM 碳燃料

【摘要】：固體氧化物燃料電池(SOFC)是一種高效地將燃料的化學(xué)能直接轉(zhuǎn)換成電能的新型發(fā)電裝置，被認(rèn)為是有史以來用途最為廣泛的能源解決方案。世界上越來越多的研究者也在關(guān)注SOFC的應(yīng)用和發(fā)展，然而電池的性能與材料有著密不可分的關(guān)系，因此研究選擇合適的電極和電解質(zhì)材料是制備出高性能電池的重要保證。 本論文圍繞這個主題展開，首先系統(tǒng)地研究了不同的合成方法對陰極材料LSM的影響，然后采用高溫固相法合成高電導(dǎo)率的電解質(zhì)材料LSGM，并將其運用于直接碳固體氧化物燃料電池(DC-SOFC)，研究其電化學(xué)性能。 陰極材料的性能與粉體的形貌、粒徑大小及分布和燒結(jié)性等有關(guān)。選擇合適的制備方法是制備高輸出性能電池的重要保證。首先分別采用固相法、甘氨酸-硝酸鹽燃燒法和溶膠-凝膠法制備了SOFC陰極材料La0.8Sr0.2MnO3(LSM)。將合成的粉體分別在不同的溫度下燒結(jié)，并通過XRD確定合成粉體成相最低燒結(jié)溫度均是900C；利用掃描電鏡對合成的粉體進(jìn)行微觀結(jié)構(gòu)的觀察和分析，結(jié)果表明，燃燒法和溶膠-凝膠法制備的LSM粉體都滿足陰極材料疏松多孔的要求；并采用Van-der Pauw四端法測量片狀陰極的直流電阻進(jìn)而計算電導(dǎo)率，結(jié)果表明三種方法合成的陰極的電導(dǎo)率(100S/cm)均滿足SOFC陰極材料電導(dǎo)率的要求；采用三電極法研究LSM陰極材料的活化行為，表明溶膠-凝膠法制備的LSM陰極與電解質(zhì)YSZ的界面阻抗均是最小。同時，將3種方法制備的LSM應(yīng)用到多孔陽極支撐型的SOFC上，制備成單電池，并采用四端法對單電池的輸出性能進(jìn)行測試，溶膠-凝膠法合成的LSM陰極制備的單電池在800C時輸出功率密度最大（317mW/cm2）�？偟膩碚f，溶膠-凝膠法合成的LSM粉末能夠有效滿足SOFC陰極材料的要求。 SOFC中最常用的電解質(zhì)材料是YSZ，但是在低溫時(1000C)，YSZ電導(dǎo)率不是很高，從而增大了歐姆電阻，電池的輸出性能受到影響。而LSGM電解質(zhì)在中低溫下電導(dǎo)率較高，被認(rèn)為是一種很有潛力的中低溫電解質(zhì)材料。本論文采用固相法合成了LSGM，并采用XRD和SEM對其進(jìn)行表征；然后采用浸漬法成功制備出管狀LSGM支撐體，并采用擔(dān)載5wt%Fe催化劑的活性炭為燃料測試其性能：850C時，LSGM支撐的DC-SOFC的最大輸出功率密度為383mW·cm-2，是YSZ支撐的最大功率密度(297mW·cm-2)的1.2倍，同時，從歐姆阻抗譜圖上可以看出來，，在測試溫度范圍內(nèi)，LSGM支撐的DC-SOFC的歐姆電阻比YSZ支撐的歐姆電阻均要小，YSZ支撐的DC-SOFC在850C時歐姆電阻為0.80Ω·cm2，而LSGM支撐的DC-SOFC在850C時歐姆電阻為0.52Ω·cm2，相對與YSZ支撐的DC-SOFC降低了35%。結(jié)果表明，采用電導(dǎo)率更高的電解質(zhì)材料能夠有效地提高電池的輸出性能。電池穩(wěn)定性測試表明，電池的性能隨著時間逐漸衰減，較少的碳燃料會導(dǎo)致電池運行時間的縮短和碳利用率的降低。
[Abstract]:Solid oxide fuel cell (SOFC) is a kind of efficient fuel chemical energy directly into electricity new energy generating device, is regarded as the most widely used energy solutions. More and more researchers in the world are also concerned about the application and development of SOFC, but the performance and battery materials there is a close relationship, so the choice of electrode and electrolyte materials appropriate is prepared an important guarantee for high performance battery.
This paper focuses on this theme, the first systematic study of the influence of different synthesis methods of cathode material LSM, and then by high temperature solid electrolyte materials with high conductivity LSGM synthesis method, and it is used to direct carbon solid oxide fuel cell (DC-SOFC), the research on the electrochemical performance.
The morphology and properties of powder cathode materials, particle size and distribution and sintering and so on. Choose the appropriate preparation method is an important guarantee for the preparation of high performance battery output. First of all, using solid phase method, SOFC cathode material La0.8Sr0.2MnO3 was prepared by sol-gel method and glycine nitrate combustion (LSM) the powders were sintered at different temperatures, and determined by XRD powder synthesis is the lowest sintering temperature is 900C; observation and Analysis on the microstructure of the powder synthesized by using scanning electron microscopy. The results show that the combustion of LSM powders prepared by sol gel method and can meet the requirements of osteoporosis the porous cathode material; and the DC resistance Van-der Pauw measurement sheet four terminal method and cathode conductivity calculation, the results show that the conductivity of the cathode prepared by three methods (100S/cm) can meet the conductance of SOFC cathode materials The rate of demand; the activation behavior of three electrode cathode materials of LSM, showed that the interface impedance of sol gel LSM cathode and YSZ electrolyte is minimal. At the same time, the 3 kinds of preparation method of LSM is applied to the porous anode supported SOFC, prepared into a single cell, and by four the output end method of the performance of the single cell test, sol-gel synthesis of LSM cathode preparation of single cell in 800C when the output power density maximum (317mW/cm2). In general, LSM powders were synthesized by sol-gel method can effectively meet the requirements. SOFC cathode materials
The most commonly used electrolyte material in SOFC is YSZ, but at low temperature (1000C), the conductivity of YSZ is not very high, thereby increasing the ohmic resistance, the output performance of the cell is affected. And LSGM electrolyte at low temperature and high conductivity, is considered to be a potential low temperature electrolyte materials. In this thesis, LSGM was synthesized by solid state method, and was characterized by XRD and SEM; and then by the impregnation method successfully prepared LSGM tubular supporting body, and using activated carbon supported 5wt%Fe catalyst for testing the performance of fuel: 850C, LSGM support DC-SOFC maximum output power density of 383mW - cm-2, is the largest power the density of YSZ support (297mW - cm-2) 1.2 times, at the same time, the figure can be seen from the impedance spectrum in the measuring temperature range, ohmic resistance of the ohmic resistance of LSGM supported DC-SOFC were smaller than YSZ support, YSZ support DC-SOF When 850C C ohm resistor of 0.80 - cm2, LSGM and DC-SOFC support at 850C ohm resistor of 0.52 cm2, compared with YSZ supported DC-SOFC reduced 35%. results show that the higher the conductivity of electrolyte materials can effectively improve the output performance of the battery. The battery stability test shows that the performance of the battery with time gradually decay, less carbon fuel will lead to lower utilization of the battery running time shortened and carbon.

【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM911.4

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 韓敏芳,李伯濤,彭蘇萍,楊翠柏,劉敬;固相反應(yīng)合成La_(1-x)Sr_xMnO_3的機(jī)理[J];北京科技大學(xué)學(xué)報;2002年06期

2 邵忠寶,牛盾,張麗君,南璇,張廣榮;溶膠-凝膠法合成La_(0.7)Sr_(0.3)MnO_3[J];東北大學(xué)學(xué)報;1999年02期

3 王世忠,江義,張雅虹,閻景旺,李文釗;La_(0.8)Sr_(0.2)MnO_3/YSZ高溫電極交流阻抗研究[J];電化學(xué);1998年03期

4 俞守耕;穩(wěn)定氧化鋯固體電解質(zhì)研究進(jìn)展[J];電源技術(shù);2004年02期

5 紀(jì)媛,劉江,賀天民,叢立功,蘇文輝;甘氨酸-硝酸鹽法制備中溫SOFC電解質(zhì)及電極材料[J];高等學(xué)校化學(xué)學(xué)報;2002年07期

6 孟廣耀,付清溪,彭定坤;中溫固態(tài)氧化物燃料電池[J];太陽能學(xué)報;2002年03期

7 唐玉寶;劉江;;以活性炭為燃料的固體氧化物燃料電池(英文)[J];物理化學(xué)學(xué)報;2010年05期

8 夏定國，魏秋明，朱時珍，劉慶國;高溫固體氧化物燃料電池中的陰極材料[J];中國稀土學(xué)報;1994年03期

9 侯俠;任立鵬;;燃料電池的發(fā)展趨勢[J];云南化工;2011年02期

10 張乃慶;孫克寧;周德瑞;賈德昌;;Study on Properties of LSGM Electrolyte Made by Tape Casting Method and Applications in SOFC[J];Journal of Rare Earths;2006年S1期

本文編號：1387461