Abstract: The effect of Ni-CeO2 cathodes on the performance of direct carbon fuel cell (DCFC) was studied. The performances of DCFC with different Ni-CeO2 cathodes generating relatively high current density and power density were reported. The results showed that DCFC using the Ni-CeO2 cathode produced the maximum current and power densities of 474 mA/cm2 and 108 mW/cm2 at 630℃, respectively, the fuel conversion efficiency was 70% at the current density of 50 mA/cm2. The DCFC using Ni-CeO2 cathode produced the maximum current and power densities of 328 mA/cm2 and 72 mW/cm2 at 500℃, respectively. XRD and SEM were employed in the cathode characterization. Some features of the cathodes which might greatly contribute to the increase in DCFC performance were discussed.

Key words: direct carbon fuel cell, power density, current density, cathode, CeO2

摘要： 考察了Ni-CeO2复合阴极对直接碳燃料电池(DCFC)输出性能的影响. 使用不同组成的Ni-CeO2复合阴极对DCFC性能进行了测试. 结果表明，使用Ni-CeO2复合阴极可显著提高DCFC在500和630℃工作时的电流密度、功率密度和燃料转化效率，500℃下DCFC最大电流密度、功率密度分别为328 mA/cm2和72 mW/cm2. 630℃下DCFC最大电流密度、功率密度分别为474 mA/cm2和108 mW/cm2，电流密度50 mA/cm2时燃料转化效率为70%. 用XRD和SEM对Ni-CeO2复合阴极材料进行了表征，并对Ni-CeO2复合阴极可能的作用机制进行了研究.

关键词: 直接碳燃料电池, 功率密度, 电流密度, 阴极, CeO2