应用化学 ›› 2022, Vol. 39 ›› Issue (5): 809-818.DOI: 10.19894/j.issn.1000-0518.210150

• 研究论文 • 上一篇    下一篇

MgO和Fe2O3的添加对GDCSi体系微观结构及电化学性能的影响

周晶, 陈俞萱, 马焌铭, 朱晓飞(), 周德凤()   

  1. 长春工业大学化学与生命科学学院,长春 130012
  • 收稿日期:2021-03-29 接受日期:2021-07-29 出版日期:2022-05-01 发布日期:2022-05-24
  • 通讯作者: 朱晓飞,周德凤
  • 基金资助:
    国家自然科学基金(21471022);吉林省科学研究基金(20190201230JC);吉林省教育厅“十三五”科技攻关计划(JJKKH20200647KJ)

Effect of MgO and Fe2O3 Incorporation on the Microstructure and Electrochemical Performance of GDCSi System

Jing ZHOU, Yu-Xuan CHEN, Jun-Ming MA, Xiao-Fei ZHU(), De-Feng ZHOU()   

  1. School of Chemistry and Life Science,Changchun University of Technology,Changchun 130012,China
  • Received:2021-03-29 Accepted:2021-07-29 Published:2022-05-01 Online:2022-05-24
  • Contact: Xiao-Fei ZHU,De-Feng ZHOU
  • About author:defengzhou65@126.com
    zhuxiaofei@ccut.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21471022);the Jilin Provincial Science Research Foundation of China(20190201230JC);the 13th Five?Year Plan for Science & Technology Research Sponsored by Department of Education of Jilin Province(JJKH20200647KJ)

摘要:

采用溶胶凝胶法制备Gd0.2Ce0.8O3-δ +0.05%(质量分数)SiO2(GDCSi)电解质。在GDCSi体系中加入Fe2O3及MgO可达到降低烧结温度的同时提高晶界电导率,并减小杂质SiO2对氧离子在晶界处传输的阻碍的目的。将MgO和Fe2O3单掺杂或双掺杂在GDCSi体系中并对GDCSi基电解质的微观形貌及电性能进行研究。结果表明,所有样品主要由立方萤石结构相组成;物质的量分数4%MgO单掺杂的GDCSi-M、物质的量分数4%Fe2O3单掺杂的GDCSi-F以及物质的量分数2%MgO-物质的量分数2%Fe2O3共掺杂的GDCSi-MF均可促进GDCSi体系晶粒增长,降低晶粒间孔隙率,提高电解质的相对密度,降低晶粒电阻Rgi、晶界电阻Rgb及总电阻Rt;GDCSi-MF具有最高晶界电导率和总电导率,在400 ℃时GDCSi-MF的晶界电导率σgb和总电导率σt分别是GDCSi的10.41和1.82倍。

关键词: 烧结助剂, 晶界改善剂, 电导率, 掺杂, 电解质

Abstract:

The incorporation of Fe2O3 and MgO in the Gd0.2Ce0.8O3-δ +0.05% (mass fraction) SiO2 (GDCSi) can reduce the sintering temperature and improve the conductivity of the grain boundary. Single doping of MgO or Fe2O3 and simultaneous addition of MgO and Fe2O3 are performed to study the effects of the doping method on the microstructure and electrochemical performance of the GDCSi electrolyte. The results indicate that no matter whether MgO and Fe2O3 are single-doped or co-doped into the GDCSi system, no second phase is produced, and all the samples form the cubic fluorite phase. The addition of 4% molar fraction MgO, 4% molar fraction Fe2O3 and 2% molar fraction MgO-2% molar fraction Fe2O3 can promote the grain growth of the GDCSi system and reduce the inter-grain porosity, in addition, reduce the grain interior resistance (Rgi), grain boundary resistance (Rgb) and total resistance (Rt). It is of interest that MgO-Fe2O3 co-doped GDCSi-MF results in the highest grain boundary conductivity (σgb) and total conductivity (σt). At 400 °C, the σgb and σt of the GDCSi-MF are 10.41 and 1.82 times higher than those of GDCSi, respectively.

Key words: Sintering aids, Grain boundary improvers, Conductivity, Doping, Electrolyte

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