La2NiO4+δ potential cathode material on La0.9Sr0.1Ga0.8Mg0.2O2.85 electrolyte for intermediate temperature solid oxide fuel cell
La2NiO4+δ potential cathode material on La0.9Sr0.1Ga0.8Mg0.2O2.85 electrolyte for intermediate temperature solid oxide fuel cell
复制标题
DOI：
10.1016/j.jpowsour.2010.11.068
复制
发表时间：
2011-09
影响因子：
9.2
通讯作者：
M. Escudero;A. Fuerte;L. Daza
中科院分区：
文献类型：
--
作者：
M. Escudero;A. Fuerte;L. Daza
La2NiO4+δ, a mixed ionic-electronic conducting oxide with K2NiF4type structure, has been studied as cathode material with La0.9Sr0.1Ga0.8Mg0.2O2.85(LSGM) electrolyte for intermediate solid oxide fuel cells (IT-SOFCs). XRD results reveal excellent chemical compatibility between the La2NiO4+δsample and LSGM electrolyte. A single cell (0.22cm2active area) was fabricated with La2NiO4+δas cathode, Ni–Sm0.2Ce0.8O1.9(2:1; w/w) as anode and LSGM as electrolyte. A thin buffer layer of Sm0.2Ce0.8O1.9(SDC) between anode and electrolyte was used to avoid possible interfacial reactions. The cell was tested under humidified H2and stationary air as fuel and oxidant, respectively. The electrochemical behaviour was evaluated by means of current–voltage curves and impedance spectroscopy. Microstructure and morphology of the cell components were analysed by SEM-EDX after testing. The maximum power densities were 160, 226, and 322mWcm−2at 750, 800 and 850°C, respectively with total polarisation resistances of 0.77, 0.48 and 0.31Ωcm2at these temperatures. Cell performance remained stable when a current density of 448mAcm−2was demanded for 144h at 800°C, causing no apparent degradation in the cell. The performance of this material may be further improved by reducing the electrolyte thickness and optimisation of the electrode microstructure.
