直接甲烷SOFC NiCu-CeO_2阳极的制备与性能

Preparation and performance of Ni Cu-CeO_2 anode for direct methane SOFC

将Ni Cu-Ce O2作为抗积碳阳极材料,应用于阳极支撑型直接甲烷固体氧化物燃料电池(SOFC)中。采用浸渍工艺在多孔Ce O2阳极基体中制备Ni Cu阳极催化剂,还原后氧化物基体与金属的质量比为60∶40。在700℃湿H2和湿CH4气氛中考察了电池的电化学性能。Ni Cu-Ce O2|GDC|BCFN电池在H2和CH4中的开路电压(OCV)分别为0.772和0.785 V,最大功率密度(MPD)分别为96和80 m W/cm2。在0.6 V进行恒压稳定性测试20 h后,电流密度下降了1.7%。通过对测试后的电池进行电子扫描电镜(SEM)和能量散射光谱(EDS)分析,发现有少量积碳产生。而Ni-Ce O2|GDC|BCFN电池在同样条件下的性能仅为:OCV(H2)=0.77 V,OCV(CH4)=0.80 V,MPD(H2)=116 m W/cm2,MPD(CH4)=59 m W/cm2,电池在40 min内电流密度下降了74%。结果表明在阳极中添加Cu不仅能够实现与Ni基阳极相当的阳极性能,而且可以有效提高Ni基阳极的抗积碳稳定性。

The resistive deposition carbon anode material of NiCu-CeO2 was fabricated for utilization of anode-supporting direct methanesolid oxide fuel cells. The anode catalyst of NiCu was prepared in porous anode matrix of CeO2 by impregnation methocl and the weight ratio of oxide matrix and metal was 60 ： 40 after reduction. In the atmosphere of damp H2 and CH4 at 700℃, electrochemical performance of the cell was investigated. The open-circuit voltage（OCV） of NiCu-CeO21GDCIBCFN cell was 0.772 and 0.785 V; maximum power density（MPD） was respectively 96 and 80 mW/cm^2. .The current density shows only 1.7% degradation after 20 h stability test at a constant voltage of 0.6 V. Very little deposition carbon was detected in the anode by SEM and EDS analysis. The performance the of Ni-CeO21GDCIBCFN cell at the same conditions was as follw： OCV（H2）=0.T7 V, OCV（CH,）=0.80 V, MPD（H2）=116 mW/cm^2 and MPD（CH4）=59 mW/cm^2. The current density decreases by 74% in 40 min. The results demonstrate it can not only achieve the comparative anode performance, but also improve the stability of resistive deposition carbon by adding Cu into Ni-based anode.