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Effect of A/B‐Site Non‐stoichiometry on the Structure and Properties of La0.9Sr0.1Ga0.9Mg0.1O3−δ Solid Electrolyte in Intermediate‐Temperature Solid Oxide Fuel Cells
ChemElectroChem ( IF 4 ) Pub Date : 2017-12-27 , DOI: 10.1002/celc.201701284
Jian Qiu Wang 1 , De Feng Zhou 1 , Jin Quan Gao 1 , Hao Ran Sun 1 , Xiao Fei Zhu 1 , Jian Meng 2
Affiliation  

(La0.9Sr0.1)x(Ga0.9Mg0.1)yO3‐δ [(LS)x(GM)y] (x=0.97, 1.00, 1.03; y=1.00 and x=1.00; y=0.97, 1.00, 1.03) electrolyte is prepared through a sol‐gel method followed by sintering at 1300 °C for 10 h. The microstructures of the samples are characterized by using X‐ray diffraction (XRD) and field‐emission scanning electron microscopy (FE‐SEM). The electrical and thermal stability properties are measured by means of electrochemical impedance spectroscopy (EIS) and thermal expansion coefficient (TEC), respectively. It is shown that phase purity could improve by adjusting the non‐stoichiometry of A/B‐site. This, in turn, affects the conductivity and thermal expansion of the solid electrolyte. The samples with B‐site defects [LS(GM)0.97] are found to exhibit the best phase purity and density with minimal grain boundary/total resistances, and superior thermal stability. The conductivity of LS(GM)0.97 is 1.56 time higher than that of LSGM. The average thermal expansion coefficient of LS(GM)0.97 at 50–850 °C is 4.13 % lower than that of LSGM. The maximum power density of single cells containing LS(GM)0.97 electrolyte could reach 0.54 W cm−1 at 800 °C, which is 16.7 % higher than that of cells containing LSGM electrolyte. The stability test for over 120 h at 800 °C indicates a slight decrease in performances during the first 10 h, but no significant differences in electrode polarization are observed even after long‐term operation. These findings suggest the potential applications of LS(GM)0.97 as a novel electrolyte for intermediate‐temperature solid oxide fuel cells.

中文翻译:

A / B站点非化学计量对中温固体氧化物燃料电池La0.9Sr0.1Ga0.9Mg0.1O3-δ固体电解质的结构和性能的影响

(La 0.9 Sr 0.1x(Ga 0.9 Mg 0.1y O 3−δ [(LS)x(GM)y ](x = 0.97,1.00,1.03; y = 1.00和x = 1.00; y= 0.97、1.00、1.03)电解质是通过溶胶-凝胶法制备的,然后在1300°C烧结10 h。样品的微观结构通过X射线衍射(XRD)和场发射扫描电子显微镜(FE-SEM)进行表征。电气和热稳定性能分别通过电化学阻抗谱(EIS)和热膨胀系数(TEC)进行测量。结果表明,通过调节A / B位的非化学计量,可以提高相纯度。这进而影响固体电解质的电导率和热膨胀。发现具有B位置缺陷的样品[LS(GM)0.97 ]具有最佳的相纯度和密度,同时具有最小的晶界/总电阻和优异的热稳定性。LS(GM)的电导率0.97是LSGM的1.56倍。LS(GM)在50–850°C时的平均热膨胀系数为0.97,比LSGM低4.13%。含有LS(GM)0.97电解质的单电池在800°C时的最大功率密度可以达到0.54 W cm -1,比含有LSGM电解质的单电池的最大功率密度高16.7%。在800°C下超过120 h的稳定性测试表明,在开始的10 h内性能略有下降,但即使长期操作后也未观察到电极极化的显着差异。这些发现表明LS(GM)0.97作为中温固体氧化物燃料电池的新型电解质的潜在应用。
更新日期:2017-12-27
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