Cu摻雜至La0.8Sr0.2CuxMn1-xO3 (LSCxM,x=0.1、0.2、0.3) 作為中低溫SOFC陰極之可行性研究;On the copper doping of La0.8Sr0.2MnO3 (LSM) cathode for IT-SOFCs

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Title:	Cu摻雜至La0.8Sr0.2CuxMn1-xO3 (LSCxM,x=0.1、0.2、0.3) 作為中低溫SOFC陰極之可行性研究;On the copper doping of La0.8Sr0.2MnO3 (LSM) cathode for IT-SOFCs
Authors:	嚴豐年;Yen, Feng-Nien
Contributors:	材料科學與工程研究所
Keywords:	固態氧化物燃料電池;燃燒合成法;LSM陰極材料;銅摻雜;Solid oxide fuel cell(SOFC);Lanthanum-strontium- manganese-oxide;Copper doping
Date:	2019-08-21
Issue Date:	2019-09-03 14:50:37 (UTC+8)
Publisher:	國立中央大學
Abstract:	本研究使用甘胺酸-硝酸鹽燃燒合成法製備具有鈣鈦礦結晶結構(La0.8Sr0.2MnO3；LSM，La0.8Sr0.2CuxMn1-xO3 x=0.1、0.2、0.3；LSC1M；LSC2M；LSC3M)之陰極粉末。探討前驅硝酸鹽溶液經由調整不同pH值，甘胺酸硝酸比(g/n ratio)，以及初生粉體在不同煆燒溫度(800、900、1000、1100 ℃)之結晶結構、形貌、熱機械性質等，再利用最好之參數製成固態氧化物燃料電池(SOFC)，進行電化學測試。經由X光繞射分析結晶結構以及掃描式電子顯微鏡觀察表面微結構，發現在pH=3、4以及g/n=1.00、1.25有最完整之特徵峰以及粉體形貌，由熱膨脹分析發現LSM4/1.25與電解質BCZY之熱膨脹係數最為相近；導電度可達495.38 S/cm，進行性能測試結果顯示在操作溫度800℃擁有最高之功率密度:41.8 mW/cm2，而摻雜銅進入LSM之實驗發現，導電度分析在LSC2M有最高之導電度提升，由495.38 S/cm提升到858.26 S/cm，進行性能結果測試發現LSM4/1.25摻雜銅取代錳有效能60%之提升，在操作溫度700℃從22.33 mW/cm2提升到37.20 mW/cm2，EIS實驗發現極化阻抗Rp下降了4.55 Ωcm2。;In this study, the nanostructured perovskite La0.8Sr0.2MnO3 (LSM) and La0.8Sr0.2Mn1-xCuxO3 (note as x=0.1; LSC1M, 0.2; LSC2M, 0.3; LSC3M) prepared by the glycine-nitrate combustion synthesis method were considered as a potential candidate for use as cathode in solid oxide fuel cells (SOFC) operated at intermediate-temperature. In the present work, combustion synthesis method was investigated by adjusting the pH of LSM nitrate solution (pH=2, 3, 4, 5) and ratio between glycine and nitrate (G/N= 0.75, 1.00, 1.25). The crystal structure and morphology of the powders after calcining were analyzed and also its thermal properties and electrochemical characteristic were discussed. The optimal combustion synthesis parameters (pH and G/N) were used to synthesize the LSCxM. Then the crystal structure and electrochemical properties were investigated. Finally, the feasibility for using as cathode in P-SOFC though combining LSM as cathode backbone and doping Cu to replace Mn. The results of LSM analysis showed that LSM1.00/3, LSM1.00/4, LSM1.25/3 and LSM1.25/4 were the optimal parameters for combustion synthesis whose crystal structure and morphology were the most suitable as cathode for SOFC. Among all, LSM1.25/4 was analyzed that its average particle size around 30nm. For the measurement of thermal expansion coefficient (TMA), the coefficient of LSM1.25/4 was about 14.36 × 10-6 K-1 which was the closest to that of electrolyte BCZY. In the results of four-probe DC conductivity measurement, LSM1.25/4 had the highest conductivity near 495.38 S/cm.The performance test results show that the highest power density is 41.8 mW/cm2 at 800 °C, and the experiment of doping copper into LSM found that the conductivity analysis has the highest conductivity increase in LSC2M, from 495.38 S/cm improved to 858.26 S/cm. The performance test showed that the LSM4/1.25 doped 0.2 copper-substituted manganese had a 60% improvement in efficiency, and the operating temperature was increased from 22.33 mW/cm2 to 37.20 mW/cm2 at 700 °C. The resistance Rp drops by 4.55 Ωcm2.
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