表面修饰对La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3)-δ阴极性能及稳定性的影响  

Impact of Surface Modification on the Performance and Stability of La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3)-δCathode

作　　者：蔡东民 杨钧 王建新[1] 官万兵[1] Cai Dongmin;Yang Jun;Wang Jianxin;Guan Wanbing(Ningbo Institute of Materials Technology&Engineering,Chinese Academy of Sciences,Ningbo 315201,China;College of Materials Science and Opto-Electronic Technology,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院宁波材料技术与工程研究所,浙江宁波315201 [2]中国科学院大学材料科学与光电技术学院,北京100049

出　　处：《稀有金属材料与工程》2022年第2期705-711,共7页Rare Metal Materials and Engineering

基　　金：科技部政府间国际创新合作重点专项(2017YFE0129300);国家自然科学基金青年基金(51702333);宁波市“科技创新2025”重大专项(2019B10043)。

摘　　要：本研究采用一步溶液浸渍法对La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3)-δ(LSCF)表面进行了La_(2)NiO_(4)+δ(LNO)纳米颗粒修饰。扫描电镜分析显示,LNO纳米颗粒均匀分布在LSCF表面,颗粒粒径在50~250 nm。电化学测试表明,与空白LSCF相比,修饰了LNO的阴极极化电阻降低了41%~50%,并且稳定性有明显提高:在750℃保温约125 h后,其极化电阻仅增大了50.42%,而空白LSCF阴极则增大了76.89%。X射线衍射分析表明在750℃保温100 h后LNO-LSCF表面出现了La_(2)SrO_(x)相。X光电子能谱分析表明,长期保温100 h后,LNO-LSCF阴极的表面Sr含量比保温前减少了3.66%,而空白LSCF阴极则增多了26.95%,说明通过表面修饰LNO可抑制LSCF表面的Sr偏析。Different concentrations of La_(2)NiO_(4)+δ(LNO)nanoparticles were decorated on La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3)-δ(LSCF)surface through one-step infiltration.Scanning electron microscope analysis shows that LNO nanoparticles are distributed uniformly on LSCF surface,with a size range 50~250 nm.Electrochemical test results reveal that compared with the bare LSCF,polarization resistance of LSCF cathode decorated with LNO particles reduces by 41%~50%,and its stability is improved,where its polarization resistance increases by 50.42%after annealing at 750℃ for about 125 h while that of bare one increases by 76.89%.Evidenced by X-ray powder diffraction,La2SrOx phase appears in LNO-LSCF after 100 h annealing,which is one of the possible reasons for enhanced stability.X-ray photoelectron spectroscopy analysis shows that after annealing for 100 h,the surface Sr content decreases by 3.66% compared to that before annealing,whereas that of the bare one increases by 26.95%,indicating that LNO modification can effectively suppress Sr surface segregation of LSCF.

关 键 词：固体氧化物燃料电池 表面修饰 LSCF 浸渍 

分 类 号：TM911.4[电气工程—电力电子与电力传动]