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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.
Nanocrystalline NiCo2O4 was synthesized by sol-gel method, and its structure and surface morphology were characterized by X-ray diffraction and transmission electron microscopy.The results show that NiCo2O4 has a spinel structure with an average particle size of about 15 nm.Using potentiodynamic linear sweep and potentiostatic Method was used to determine its catalytic performance for the electrochemical reduction of H2O2 in alkaline solution.It was found that NiCo2O4 has high catalytic activity and stability for the electrochemical reduction of H2O2. When H2O2 concentration is lower than 0.6 mol.L-1, The chemical reduction reaction was mainly carried out by the direct reduction route.The open circuit voltage of Al-H2O2 semi-fuel cell with NiCo2O4 cathode catalyst was 1.6 V at room temperature, and the peak power density was 209 mW in 1.0 mol.L-1 H2O2 solution. cm-2, the current density at this time is 220mA.cm-2.