Sr_(2)MgMoO_(6)阳极材料制备与催化性能  

Anode Material Sr_(2)MgMoO_(6):Preparation and Catalytic Performance

作　　者：李付绍 徐应仙 武青青 沈虎峻 邓明森 LI Fu-Shao;XU Ying-Xian;WU Qing-Qing;SHEN Hu-Jun;DENG Ming-Sen(Guizhou Provincial Key Laboratory of Computational Nano-material Science,Guizhou Education University,Guiyang 550018,China)

机构地区：[1]贵州师范学院贵州省纳米材料模拟与计算重点实验室,贵阳550018

出　　处：《无机化学学报》2022年第10期2028-2036,共9页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.52062006);贵州省基础研究计划(黔科合基础-ZK[2021]一般237)资助。

摘　　要：通过溶胶-凝胶过程制备了固体氧化物燃料电池双钙钛矿阳极材料Sr_(2)MgMoO_(6)(SMMO),研究了样品制备过程对材料的相态结构组成、传输性能、H_(2)氧化催化活性等方面的影响。结果表明,SMMO对制备过程的要求高,难以通过简单一步退火反应获得相态纯净的双钙钛矿结构,高纯度的SMMO需要经过反复混合及充分退火反应制取,同时样品中少量的杂质相SrMoO_(4)也很难彻底消除;样品中的杂质对材料的电导率有明显影响,纯度越高,材料的导电传输性能越好;SMMO的纯度对阳极材料的电化学性能影响很大,纯度越高,阳极的界面阻力越小,阳极催化氧化H_(2)的性能越好,对应单电池的输出功率越大;在800℃下,SMMO阳极的界面电阻低至1.07Ω·cm^(2),对应单电池的输出功率可达710 mW·cm^(-2)。Double⁃perovskite oxide Sr_(2)MgMoO_(6)(SMMO)was prepared as anode material for solid⁃oxide fuel cells by the sol⁃gel route.The effect of the material preparation scenario on the phase constituents,transport property,and catalyzing activity for H_(2) oxidization was investigated.The results show that the preparation process of SMMO requires strict control,and a phase⁃pure sample with a double⁃perovskite structure can be hardly synthesized by a one⁃step annealing reaction,and a high purity grade of SMMO requires the repeated thorough mixing and full annealing.In the meanwhile,impurity phase SrMoO_(4) in a very small amount is almost unavoidable.The impure sub⁃stance in samples affects a great deal of the electrical conductivity of this material,and a purer sample exhibits bet⁃ter conductive performance.The purity of SMMO has a tremendous impact on the electrochemical performance of this material,and a purer sample exhibits a lower anode interfacial resistance,a higher catalyzing activity for H_(2) oxi⁃dizing,and a larger power output of the corresponding single cell.At a temperature of 800℃,the area⁃specific resis⁃tance of the SMMO anode was as low as 1.07Ω·cm2,and power output from the corresponding single cell reached to 710 mW·cm^(-2).

关 键 词：固体氧化物燃料电池 阳极 双钙钛矿 电化学性能 

分 类 号：TB34[一般工业技术—材料科学与工程] TQ152[化学工程—电化学工业]