中文摘要：

利用溶胶-凝胶法合成纳米NiCo2O4,并利用X射线衍射和透射电镜分析其结构和表面形貌.结果表明NiCo2O4具有尖晶石结构,平均粒径约为15 nm.利用电势线性扫描和恒电势法测定了其对H2O2在碱性溶液中电化学还原反应的催化性能.发现NiCo2O4对H2O2电化学还原具有高的催化活性和稳定性,在H2O2浓度低于0.6 mol.L-1时,其电化学还原反应主要通过直接还原途径进行.以NiCo2O4为阴极催化剂的Al-H2O2半燃料电池在室温下的开路电压达1.6 V; 在1.0 mol.L-1 H2O2溶液中,峰值功率密度达209 mW.cm-2,此时电流密度为220mA.cm-2.

英文摘要：

NiCo2O4 nanoparticles were synthesized using a sol-gel method.Their structures and morphologies were characterized using X-ray diffraction（XRD） and transmission electron microscopy（TEM）.Results indicate that NiCo2O4 has a spinel structure and an average diameter of around 15 nm.The catalytic behavior of NiCo2O4 for H2O2 electroreduction in alkaline medium was investigated by linear potential sweep and chronoamperometry.NiCo2O4 shows considerable activity and stability for the electrocatalytic reduction of H2O2.The electroreduction occurs mainly via a direct pathway at H2O2 concentrations lower than 0.6 mol.L-1.An Al-H2O2 semi-fuel cell was constructed using NiCo2O4 as the cathode catalyst.The cell displays an open circuit voltage of 1.6 V and a peak power density of 209 mW.cm-2 at a current density of 220 mA.cm-2 running on 1.0 mol.L-1 H2O2 at ambient temperature.