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Efficient strategy to boost the electrochemical performance of yttrium stabilized zirconia electrolyte solid oxide fuel cell for low-temperature applications
Ceramics International ( IF 5.1 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.ceramint.2020.09.190
Jingjing Nie , Dan Zheng , K. Sivajee Ganesh , Muhammad Akbar , Chen Xia , Wenjing Dong , Xunying Wang , Hao Wang , Baoyuan Wang

Abstract Yttrium stabilized zirconia (YSZ) used as the state-of-the-art electrolyte for solid oxide fuel cells (SOFCs) requires high temperature (over 800 °C) to realize sufficient oxygen ion conductivity. Thus, the high operational temperature is the main restriction for the commercial process of YSZ-based SOFCs. To obtain decent ionic conductivity at intermediate-low temperatures, Sr-free cathode LaNiO3 is introduced into YSZ to construct a novel LaNiO3-YSZ composite electrolyte, which is sandwiched by two Ni0.8Co0.15Al0.05LiO2-δ (NCAL) electrodes to assemble systematical fuel cells. This device presents an excellent peak output of 1045 mW cm-2 at 600 °C and even 399 mW cm-2 at 450 °C. A series of characterizations indicates that the oxygen ion conductivity of the LaNiO3-YSZ composite is significantly promoted in comparison with that of pure YSZ, and the LaNiO3 component has certain proton conductivity after hydrogenation. Both of the two factors contributes to the superior performance of such devices at intermediate-low temperatures. Furthermore, the sharp decrease in electronic conductivity for LaNiO3 in hydrogen atmosphere combined with Schottky junction at the anode-electrolyte interface eliminates the short-circuiting problem. Our work demonstrates that incorporating Sr-free cathode LaNiO3 into the YSZ electrolyte is an efficient strategy to boost the performance and reduce the operational temperature of YSZ-based SOFCs.

中文翻译:

提高低温应用钇稳定氧化锆电解质固体氧化物燃料电池电化学性能的有效策略

摘要 钇稳定氧化锆 (YSZ) 作为最先进的固体氧化物燃料电池 (SOFC) 电解质需要高温(超过 800 °C)才能实现足够的氧离子电导率。因此,高操作温度是 YSZ 基 SOFC 商业化过程的主要限制因素。为了在中低温下获得良好的离子电导率,将无 Sr 阴极 LaNiO3 引入 YSZ 中构建新型 LaNiO3-YSZ 复合电解质,该复合电解质由两个 Ni0.8Co0.15Al0.05LiO2-δ (NCAL) 电极夹在中间组装系统燃料电池。该器件在 600 °C 时具有 1045 mW cm-2 的出色峰值输出,在 450 °C 时甚至可以达到 399 mW cm-2。一系列表征表明,与纯 YSZ 相比,LaNiO3-YSZ 复合材料的氧离子电导率显着提高,LaNiO3组分加氢后具有一定的质子传导性。这两个因素都有助于此类器件在中低温下的卓越性能。此外,LaNiO3 在氢气氛中的电子电导率急剧下降,再加上阳极-电解质界面处的肖特基结,消除了短路问题。我们的工作表明,将无 Sr 阴极 LaNiO3 加入 YSZ 电解质中是提高 YSZ 基 SOFC 性能和降低工作温度的有效策略。LaNiO3 在氢气氛中的电子电导率急剧下降,再加上阳极-电解质界面处的肖特基结,消除了短路问题。我们的工作表明,将无 Sr 阴极 LaNiO3 加入 YSZ 电解质中是提高 YSZ 基 SOFC 性能和降低工作温度的有效策略。LaNiO3 在氢气氛中的电子电导率急剧下降,再加上阳极-电解质界面处的肖特基结,消除了短路问题。我们的工作表明,将无 Sr 阴极 LaNiO3 加入 YSZ 电解质中是提高 YSZ 基 SOFC 性能和降低工作温度的有效策略。
更新日期:2021-02-01
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