Stability and electrochemical performance of lanthanum ferrite-based composite SOFC anodes in hydrogen and carbon monoxide
Stability and electrochemical performance of lanthanum ferrite-based composite SOFC anodes in hydrogen and carbon monoxide
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DOI：
10.1016/j.electacta.2016.05.049
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发表时间：
2016-08
影响因子：
6.6
通讯作者：
Xiaoyan Wu;Xiaoliang Zhou;Yu Tian;Xiaowei Kong;Jun Zhang;Wei Zuo;Xuesong Ye
中科院分区：
文献类型：
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作者：
Xiaoyan Wu;Xiaoliang Zhou;Yu Tian;Xiaowei Kong;Jun Zhang;Wei Zuo;Xuesong Ye
本文报道了一种用于固体氧化物燃料电池（SOFCs）的铁酸镧基钙钛矿阳极La0.9Ca0.1Fe1-xNbxO3-δ(LCFNbx, x = 0,0.05, 0.1和0.2)，具有良好的稳定性和电化学性能。采用柠檬酸-硝酸法制备粉末。通过在ScSZ支架中渗透相应的金属硝酸盐溶液并进行热处理，构建了LCFNbx/ScSZ ((Sc2O3)0.1（CeO2)0.01(ZrO2)0.89）复合阳极。x射线衍射结果表明，在B位掺杂Nb可使材料在高达800℃的还原气氛中保持稳定。lcfnb0.1的化学稳定性归因于Nb在高荷电态的引入对Fe价态稳定性的约束。在750℃下，LCFNb0.1/ScSZ复合阳极的电池功率密度分别为467.1和375.8 mW/cm2。该电池在开路电压下的面积比电阻分别为0.75和2.30 Ωcm2。扫描电镜结果表明，LCFNb0.1层具有良好的多孔性，与ScSZ支架具有良好的粘附性，有利于ScSZ支架在h2o2和CO中的电化学过程。本文的研究结果表明，LCFNb0.1/ScSZ在h2o2和CO中具有高稳定性和高电化学性能，是一种很有前景的SOFCs复合阳极。
We here report a lanthanum ferrite-based perovskite anode La0.9Ca0.1Fe1-xNbxO3-δ(LCFNbx, x = 0, 0.05, 0.1 and 0.2) for solid oxide fuel cells (SOFCs) with intriguing stability and electrochemical performance. The powders were prepared by citric acid-nitrate method. The LCFNbx/ScSZ ((Sc2O3)0.1(CeO2)0.01(ZrO2)0.89) composite anodes were constructed by infiltrating the corresponding metal nitrate solution into the ScSZ scaffold followed by heat treatment. X-ray diffractometer results indicated that Nb doping in B site can stabilize the material in the reducing atmospheres up to 800 °C. The chemical stability of LCFNb0.1is attributed to the constrained valence stability of Fe by the Nb introduction in highly charged state. The maximum power densities of the cell with LCFNb0.1/ScSZ composite anode were 467.1 and 375.8 mW/cm2in H2and CO at 750 °C, respectively. The area specific resistances of the cell at open circuit voltage were 0.75 and 2.30 Ωcm2, respectively. Scanning electron microscopy results showed that the LCFNb0.1layer was porous and well adhered to the ScSZ scaffold, which facilitated the electrochemical processes in H2and CO. The obtained results in this paper indicate that the LCFNb0.1/ScSZ is a promising composite anode for the SOFCs with both high stability and high electrochemical performance in H2and CO.