泡沫镍载NiCO2O4电极的制备及其催化H2O2电氧化的性能

本文以水热法结合热处理法原位制备了泡沫镍载NiCo2O4纳米线电极,使用XRD、SEM和TEM对合成的NiCo2O4纳米线进行了表征,NiCo2O4纳米线直径约80 nm,长度约3~5μm.使用循环伏安和计时电流法测试了泡沫镍载NiCo2O4纳米线催化H2O2的电氧化性能,结果表明泡沫镍载NiCo2O4纳米线对H2O2电氧化有着优良的催化活性、稳定性和传质性能,在0.3 V电位下0.4 mol·L-1H2O2和2 mol·L-1NaOH溶液中氧化电流可达380 mA·cm-2.

Preparation of nanostructured mesoporous Ni Co_2O_4 and its electrocatalytic activities for water oxidation

Nanostructured mesoporous Ni Co2O4,Co3O4 and Ni O spinel oxides were prepared through the hydroxide coprecipitation method using EG（ethylene glycol） as solvent without any template.The Ni Co2O4 powders were analyzed by TGA,XRD,N2adsorption-desorption,SEM and EDS.And the electrocatalytic properties of Ni Co2O4/Ti,Co3O4/Ti and Ni O/Ti electrodes for oxygen evolution in 0.1 mol/L KOH（p H = 13）were tested by cyclic voltammetry,Tafel curves and electrolysis.The result shows that Ni Co2O4/Ti electrode has higher electrocatalytic activity in oxygen evolution reaction than Co3O4/Ti and NiO/Ti electrodes.Ni Co2O4/Ti electrode prepared at 350°C has the highest apparent current density and the highest true current density.The Tafel slope of Ni Co2O4/Ti electrode prepared at 350°C is 68.49 m V/dec.