高温极化对Ni8-Fe2-LSGMC5复合阳极性能的影响

Effect of high temperature polarization on the performance of Ni8-Fe2-LSGMC5 composite anode

利用XRD、SEM及多种电化学技术,考察了高温原位极化对Ni8-Fe2-La0.8Sr0.2Ga0.8Mg0.15Co0.05O3-δ(LSGMC5)复合阳极性能的影响。高温极化改善了Ni-Fe复合阳极及电极/电解质界面的微观结构,减小了欧姆电阻和极化电阻,提高了电极的活性。极化没有改变复合阳极的物相,电极以Ni3Fe合金的形式存在。极化电流密度是决定电极性能的主要因素,在925℃下,随着极化电流密度由0 A/cm2增大至6 A/cm2,相应的电池在800℃下的最大功率密度由0.09 W/cm2增加至1.00 W/cm2。

The effect of in-situ polarization at high temperature on the performance of Ni8-Fe2-La0.8Sr0.2Ga0.8Mg0.15Co0.05O3_ δ（LSGMC5） composite anode was studied by using XRD, SEM and multiple electrochemical techniques. The microstructure of the Ni-Fe composite anode and the anode/electrolyte interface was improved by polarization at high temperature, the ohmic resistance and polarization resistance were decreased. The polarization did not change the phase composition of the composite anode, the electrodes were existing in the form of Ni3Fe alloy. Polarization current densities were the key factors to determine the performance of the electrode. The maximum power density at 800 ℃ of the cell increased from 0.09 W/cm^2 to 1.00 W/cm^2 while the polarization current density at 925 ℃ increased from 0 A/cm^2 to 6 A/cm^2.