稀有金属材料与工程
稀有金屬材料與工程
희유금속재료여공정
RARE METAL MATERIALS AND ENGINEERNG
2009年
z2期
692-695
,共4页
孔江榕%张勇%邓长生%徐景明
孔江榕%張勇%鄧長生%徐景明
공강용%장용%산장생%서경명
固体氧化物电解池(SOEC)%复合阳极%锶掺杂的锰酸镧(LSM)%电化学性能
固體氧化物電解池(SOEC)%複閤暘極%鍶摻雜的錳痠鑭(LSM)%電化學性能
고체양화물전해지(SOEC)%복합양겁%송참잡적맹산란(LSM)%전화학성능
solid oxide electrolysis cell (SOEC)%composite anode%strontium-doped lanthanum manganites (LSM)%electrochemical performance
采用共沉淀-共沸蒸馏法合成锶掺杂的锰酸镧(LSM)粉体,在此基础上制备了LSM与钇稳定的氧化锆(YSZ)的复合材料,并研究了该材料应用于固体氧化物电解池(SOEC)阳极的性能.通过XRD、TEM、SEM等手段分析了该材料的化学稳定性及微观结构.通过动电位扫描以及电化学阻抗谱(EIS)研究了该阳极材料的电化学性能.TEM分析显示共沉淀-共沸蒸馏法在减小粉体粒径方面要优于传统的共沉淀方法.SEM结果显示经过1200 ℃,2 h的烧结后,复合阳极与电解质结合紧密,阳极材料内部孔隙均匀,YSZ与LSM两相各自形成连通的网络结构.对不同组成和不同结构的阳极复合材料的电化学性能进行了测试,结果显示多层的阳极结构增加了三相界面(TPB)的长度.
採用共沉澱-共沸蒸餾法閤成鍶摻雜的錳痠鑭(LSM)粉體,在此基礎上製備瞭LSM與釔穩定的氧化鋯(YSZ)的複閤材料,併研究瞭該材料應用于固體氧化物電解池(SOEC)暘極的性能.通過XRD、TEM、SEM等手段分析瞭該材料的化學穩定性及微觀結構.通過動電位掃描以及電化學阻抗譜(EIS)研究瞭該暘極材料的電化學性能.TEM分析顯示共沉澱-共沸蒸餾法在減小粉體粒徑方麵要優于傳統的共沉澱方法.SEM結果顯示經過1200 ℃,2 h的燒結後,複閤暘極與電解質結閤緊密,暘極材料內部孔隙均勻,YSZ與LSM兩相各自形成連通的網絡結構.對不同組成和不同結構的暘極複閤材料的電化學性能進行瞭測試,結果顯示多層的暘極結構增加瞭三相界麵(TPB)的長度.
채용공침정-공비증류법합성송참잡적맹산란(LSM)분체,재차기출상제비료LSM여을은정적양화고(YSZ)적복합재료,병연구료해재료응용우고체양화물전해지(SOEC)양겁적성능.통과XRD、TEM、SEM등수단분석료해재료적화학은정성급미관결구.통과동전위소묘이급전화학조항보(EIS)연구료해양겁재료적전화학성능.TEM분석현시공침정-공비증류법재감소분체립경방면요우우전통적공침정방법.SEM결과현시경과1200 ℃,2 h적소결후,복합양겁여전해질결합긴밀,양겁재료내부공극균균,YSZ여LSM량상각자형성련통적망락결구.대불동조성화불동결구적양겁복합재료적전화학성능진행료측시,결과현시다층적양겁결구증가료삼상계면(TPB)적장도.
Strontium-doped lanthanum manganites (LSM) perovskite were synthesized by coprecipitation-azeotropic distillation (CP-AD) method. The powder was mixed with yttria-stabilized zirconia (YSZ) powder to fabricate composite anodes of solid oxide electrolysis cells (SOECs), and their electrochemical properties were investigated at 800 ℃, which is the SOEC working temperature. The TEM analysis demonstrated that the CP-AD method had advantages in reducing the particle size and dispersing the particles from each other. The SEM analysis showed that the electrode layer combined closely with the electrolyte and almost no defects were observed after sintering at 1200 ℃ for 2 h. The porosity was well distributed and the LSM and YSZ networks were formed respectively. Electrochemical performances of LSM-YSZ composite anodes with different components and structures were measured. The results showed that multi-layer structure increased the length of thriple phase boundary (TPB).