单室固体氧化物燃料电池阴极材料La0.75Sr0.25Cr0.5Mn0.5O3的电化学性能研究

摘要

采用高温固相法制备了La0.75Sr0.25Cr0.5Mn0.5O3(LSCM)并利用XRD,SEM以及电化学阻抗谱(EIS)分别对粉体及电极进行研究.结果发现LSCM在C3H8-O2-N2混合气氛下能够保持很好的高温化学稳定性,且与电解质材料YSZ在1 400 ℃空气气氛下不发生化学反应.电化学测试结果表明,阳极支撑型单室固体氧化物燃料电池Ni-YSZIYSZILSCM在700 ℃、C3H8-O2-N2混合气氛下的短路电流密度达317 mA·cm-2,最大功率密度73 mW·cm-2.将LSCM与CGO形成梯度阴极,相同测试条件下,单室电池的短路电流密度为560 mA·cm-2,功率密度达到110 mW·cm-2,电池输出性能提高约50%.%La0.75Sr0.25Cr0.5Mn0.5O3 (LSCM) was prepared by Solid State Reaction and studied by XRD, SEM and EIS spectrum, respectively. The results showed that LSCM maintains good chemical stability at high temperature in the reduced C3H8-O2-N2 atmosphere. This material has no reaction with YSZ at 1 400 ℃ in air. The short-circuit current density of the anode supported single chamber solid oxide fuel cell (SC-SOFC) Ni-YSZIYSZILSCM reached 317 mA·cm-2 and the maximum power density was 73 mW ·cm-2 at 700 ℃ in C3H8-O2-N2 mixed atmosphere. In the gradient cathode SC-SOFC, a short circuit current density of 560 mA·cm-2 and the power density 110 mW 'cm-2 was obtained in the same test condition. In this way, the output performance of the cell increased by about 50％.