熔盐法制备La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3)敏感电极在NO_(2)传感器中的应用  

Application of La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3) Prepared by Molten Salt Method as Sensitive Electrode in NO_(2) Sensor

作　　者：孟德凯 刘永光 王岭 戴磊 孟维薇 MENG Dekai;LIU Yongguang;WANG Ling;DAI Lei;MENG Weiwei(College of Chemical Engineering,North China University of Science and Technology,Hebei Provincial Key Laboratory of Environmental Optoelectronic Catalytic Materials,Tangshan 063210)

机构地区：[1]华北理工大学化学工程学院,河北省环境光电催化材料重点实验室,河北唐山063210

出　　处：《分析科学学报》2024年第5期485-492,共8页Journal of Analytical Science

基　　金：国家自然科学基金(62241104,52371187);河北省自然科学基金(B2022209018);唐山市科技计划项目(21130214C,22130215G);唐山市人才资助计划(A202202006);河北省省属高等学校基本科研业务费研究项目(JQN2022012)。

摘　　要：本文通过熔盐法分别在KCl、NaCl和KCl-NaCl体系中合成了钙钛矿材料La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3)(LSCF),并以其为敏感电极,以钇稳定氧化锆(YSZ)为固体电解质组装成阻抗型NO2传感器,研究了不同合成体系对传感器敏感性能的影响。通过X射线衍射仪、扫描电子显微镜和透射电子显微镜分析了LSCF敏感电极的相组成和微观形貌,结果表明,合成LSCF材料的粒径与熔盐体系的熔点相关,并且通过X射线光电子能谱仪发现,通过KCl体系可以制备表面Sr含量较低的LSCF,从而提高了电导率。敏感性能测试结果表明,传感器在400℃~550℃有良好的响应恢复特性,其中基于KCl熔盐体系制备的LSCF为敏感电极的传感器表现出最高的灵敏度(15.75°/十),并对CH_(4)、CO_(2)、H_(2)、NH_(3)和NO具有良好的抗干扰能力。La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3)(LSCF)perovskite materials were synthesized in KCl,NaCl and KClNaCl systems by molten salt method.Using them as sensitive electrodes and yttrium stabilized zirconia(YSZ)as solid electrolytes,impedancetype NO_(2) sensors were assembled.The effects of different synthesis systems on the sensitivity of the sensors were studied.The phase composition and micromorphology of LSCF sensitive electrodes were analyzed by Xray diffractometer,scanning electron microscope and transmission electron microscope.The results show that the particle size of the synthesized LSCF material is related to the melting point of the molten salt system,and Xray photoelectron spectroscopy shows that the LSCF with low Sr content on the surface can be prepared by KCl system,thus improving the electrical conductivity.The sensitivity test results show that the sensor has good response recovery characteristics at 400℃-550℃.The sensor with a sensitive electrode based on KCl molten salt system shows the highest sensitivity(15.75degree/decade)and has good antiinterference ability to CH_(4),CO_(2),H_(2),NH_(3) and NO.

关 键 词：熔盐法 NO_(2)传感器 阻抗谱型 钙钛矿材料 

分 类 号：O657.1[理学—分析化学]