Study of Ni Composite Anodes for Dimethyl Ether Fuel Cell

制备并表征了二甲醚(DME)固体氧化物燃料电池(SOFCs)系列Ni-Fe-La0.8Sr0.2Ga0.8Mg0.115Co0.085O3(LSGMC8.5)复合阳极,电极中Ni与Fe的摩尔比分别为9∶1、8∶2、7∶3、5∶5,电极中Ni-Fe的总质量分数为75%.利用多种技术考察了电极的物相组成,电极以及电极/电解质界面的微观结构,电极/电解质界面上进行的DME电化学氧化反应.结果表明,复合阳极中Fe含量的增加促进了电极的烧结,同时改变了电极/电解质界面的微观结构.电极催化DME电化学氧化的活性明显依赖于Ni、Fe的比例,Ni、Fe的摩尔比为8∶2的电极具有最高的电化学活性.Ni-Fe-LSGMC8.5电极具有较高的催化DME氧化反应的活性与稳定性,没有观察到电极中存在明显的积碳现象.Series of Ni-Fe-La0.8Sr0.2Ga0.8Mg0.115Co0.085O3(LSGMC8.5) composite anodes were prepared and characterized for solid oxide fuel cells(SOFCs) fueled with dimethyl ether(DME). The molar ratio of Ni to Fe was 9∶1, 8∶2, 7∶3, and 5∶5, respectively, and the total mass fraction of Ni-Fe in the electrode was 75%. Multiple techniques were applied to study the phase composition, the microstructure of the electrode, and the electrochemical oxidation of DME over the electrode/electrolyte interface. The results demonstrated that increase in the amount of Fe in the electrode improved the sintering activity of the electrode and changed the microstructure of the electrode and electrode/electrolyte interface. The activities for electrochemical oxidation of DME of the electrodes depended strongly on the molar ratio of Ni to Fe, and the electrode with a molar ratio of Ni to Fe at 8∶2 exhibited the highest activity. The electrodes showed good activity and stability for DME oxidation, and no obvious coke deposition was observed.福建省科技攻关计划重点项目(2003H046);; 留学回国人员基金资