一步法合成La_(0.4)Sr_(0.6)Co_(0.2)Fe_(0.7)Nb_(0.1)O_(3-δ)-Ce_(0.8)Gd_(0.2)O_(2-δ)对称电极应用于SOFC性能研究  

Co-synthesis of La_(0.4)Sr_(0.6)Co_(0.2)Fe_(0.7)Nb_(0.1)O_(3-δ)-Ce_(0.8)Gd_(0.2)O_(2-δ) Symmetrical Electrode for SOFC Performance Study

作　　者：徐娜[3] 孙梦真 朱腾龙 于龙娇 耿多 徐占林[1] Xu Na;Sun Mengzhen;Zhu Tenglong;Yu Longjiao;Geng Duo;Xu Zhanlin(Jilin Normal University,Changchun 136000,China;Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]吉林师范大学,吉林长春136000 [2]南京理工大学,江苏南京210094 [3]吉林师范大学环境友好材料制备与应用教育部重点实验室,吉林长春136000

出　　处：《稀有金属材料与工程》2021年第3期995-999,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51702163);吉林省发展和改革委员会产业技术研究与开发项目(2020C026-4);吉林省教育厅“十三五”科学技术研究项目(JJKH20200423KJ);吉林师范大学博士启动项目(2018009)。

摘　　要：一步法合成La_(0.4)Sr_(0.6)Co_(0.2)Fe_(0.7)Nb_(0.1)O_(3-δ)-Ce_(0.8)Gd_(0.2)O_(2-δ)(LSCFN-CGO)混合电导对称电极,并采用La_(0.8)Sr_(0.2)Ga_(0.83)Mg_(0.17)O_(3-δ)(LSGM)作为电解质制备了结构为LSCFN-CGO‖_(LSGM)‖LSCFN-CGO的对称电池。分别使用X射线衍射(XRD)仪和扫描电子显微镜(SEM)对LSCFN-CGO粉体物相及电极微观结构进行分析。一步法制得的LSCFN-CGO电极粉体为纯相,LSCFN钙钛矿相与CGO萤石相具备极好的化学相容性,且烧结得到了良好微观结构的对称电极。采用H_(2)(3%H_(2)O)、C_(3)H_(8)(3%H_(2)O)为燃料气测试电池性能,850℃电池最大功率密度可分别达980和869mW/cm^(2)。稳定性测试在C_(3)H_(8)(3%H_(2)O)气氛中0.3 A/cm^(2)的恒流放电条件下进行,全程共420 h,衰减较小,期间进行8次电极氧化还原循环,对称电极具有理想的碳基燃料下氧化还原再生能力。结果表明,采用一步法合成混合电导电极是一种简便、优化的电极制备方法,具有广阔的应用前景。One step method was investigated to prepare La_(0.4)Sr_(0.6)Co_(0.2)Fe_(0.7)Nb_(0.1)O_(3-δ)-Ce_(0.8)Gd_(0.2)O_(2-δ)(LSCFN-CGO)compound symmetrical electrode.La_(0.8)Sr_(0.2)Ga_(0.83)Mg_(0.17)O_(3-δ)(LSGM)was used as electrolyte and symmetrical cells with a configuration of LSCFN-CGO‖LSGM‖LSCFN-CGO were fabricated.Phase-analysis and electrode microstructure of LSCFN-CGO were examined by X-ray diffraction(XRD)and scanning electron microscopy(SEM).Results show that LSCFN-CGO is identified to be pure phase and perovskite structured LSCFN is chemically compatible with fluorite structured CGO.With H_(2)(3%H_(2) O)and C_(3)H_(8)(3%H_(2) O)as fuel for the cell,the maximum power densities are 980 and 869 mW/cm^(2) at 850℃.Moreover,the long-term stability of the cell is stable at constant current of 0.3 A/cm^(2) for 420 h with C_(3)H_(8)(3%H_(2) O)as fuel,8 redox cycles are carried out,and the symmetrical electrode had ideal redox regeneration ability under carbon-based fuel.The results show that one step method is a facile and optimized electrode fabrication procedure and owns promising application prospects.

关 键 词：一步合成法 LSCFN-CGO 对称型固体氧化物燃料电池 C_(3)H_(8) 稳定性 

分 类 号：TM911.4[电气工程—电力电子与电力传动]