摻雜對SrCoO3陰極材料特性影響

The effect of dopant on SrCoO3 cathode materials

黃建中(Chien-Chung Huang)

指導教授 ： 王錫福

國立臺北科技大學/工程學院/材料及資源工程系研究所/碩士(2011年)

https://doi.org/10.6841/NTUT.2011.00554

摘要

本研究利用Pechini法製備SrCo1-xSbxO3-δ(x=0.02、0.05、0.10、0.15)系列粉體，利用固態合成法製備SrCo1-xSnxO3-δ(x=0.05、0.10、0.15、0.20)系列粉體與PrxSr1-xCo0.95Sn0.05O3-δ(x=0.1、0.20、0.30)系列粉體，此三系列皆為鈣鈦礦結構且具有混合導體。本研究利用B位摻雜Sb與Sn不同比例，A位摻雜Pr不同比例，來探討其相結構穩定性與物理特性和化學穩定性。
SrCo1-xSbxO3-δ(x=0.02、0.05、0.10、0.15)系列，當Sb摻雜含量為2%與5%時，其結構為正方晶，摻雜10%與15%則轉變成立方晶結構。SrCo1-xSnxO3-δ(x=0.05、0.10、0.15、0.20)系列，摻雜Sn皆可讓結構穩定成立方晶，但超過10%則無法再固溶進去產生二次相。PrxSr1-xCo0.95Sn0.05O3-δ(x=0.1、0.20、0.30)系列，摻雜Pr也可使結構穩定成立方相，但摻雜含量至30%以無法固溶進去產生二次相。
導電率方面，SrCo0.98Sb0.02O3-δ在450℃有最高導電率約510S•cm-1。SrCo1-xSnxO3-δ部份，SrCo0.95Sn0I.05O3-δ在550℃有最高導電率在550 S•cm-1。PrxSr1-xCo0.95Sn0.05O3-δ部份，在Pr0.2Sr0.8Co0.95Sn0.05O3-δ在200℃有最高導電率在1225 S•cm-1。整體來講，此三系統皆可用於中溫型固態氧化物燃料之陰極材料。
本研究之陰極材料皆與LSGM電解質有良好的化學穩定性，經1100oC持溫兩小時熱處理皆無二次相產生。SrCo1-xSbxO3-δ系列與SDC電解質在熱處理1100oC持溫兩小時無二次相產生。SrCo1-xSnxO3-δ與PrxSr1-xCo0.95Sn0.05O3-δ在熱處理1000oC持溫兩小時無二次相產生。

關鍵字

固態氧化物燃料電池 ； 混合導體 ； Pechini法

並列摘要

The synthesis of the SrCo1-xSbxO3-δ(x =0.02、0.05、0.10、0.15)
Series powder was performed via Pechini method. SrCo1-xSnxO3-δ(x=0.05、0.10、0.15、0.20) and PrxSr1-xCo0.95Sn0.05O3-δ(x=0.1、0.20、0.30) were synthesized by a solid state reaction. The three series are all perovskite structure and display mixed ionic and electronic conducting. In this study, B site doped Sb and Sn in different ratio, A site different from the ratio of Pr doping, to investigate the structural stability and physical properties and chemical stability.
SrCo1-xSbxO3-δ(x=0.02、0.05、0.10、0.15) system，X-ray diffraction results show the stabilization of a tetragonal structure with Sb contents between x = 0.05 and x = 0.10.At x = 0.15 and x = 0.20 a phase transition take place and the material is defined in the cubic structure. SrCo1-xSbxO3-δ(x=0.02、0.05、0.10、0.15) system，doping Sn can be stabilization of a cubic structure ,but more than 10% are unable to solid solution result in produce the second phase . PrxSr1-xCo0.95Sn0.05O3-δ(x=0.1、0.20、0.30) system，doping Pr can be stabilization of a cubic structure ,but more than 30% are unable to solid solution result in produce the second phase .
The sample with SrCo0.98Sb0.02O3-δ displays the highest conductivity value that
reaches 510 S cm− 1 at 450 oC .The SrCo1-xSbxO3-δ system , SrCo0.95Sn0.05O3-δ exhibits the highest conductivity of 550 S•cm-1 at 550 oC. The SrCo1-xSbxO3-δ system , PrxSr1-xCo0.95Sn0.05O3-δ exhibits the highest conductivity of 1225 S•cm-1 at 200 oC.
In the study , all sample display chemical compatibility with electrolyte LSGM under the 1100oC thermal treatment . SrCo1-xSnxO3-δ and PrxSr1-xCo0.95Sn0.05O3-δ sample display chemical compatibility with electrolyte SDC20 under the 1000oC thermal treatment .
The results indicate that three system all are potential cathode materials for application in IT-SOFCs.

並列關鍵字

SOFC ； MICC ； Pechini

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