介孔四氧化三钴的制备及电催化水析氧研究

Preparation of mesoporous Co_3O_4 and water electrocatalytic oxidation evolution

以氯化钴(CoCl_2·6H_2O)和钼酸铵((NH_4)_6Mo_7O_(24)·4H_2O)为原料,通过水解、静电组装和焙烧制成Co_3O_4/MoO_3复合物,再用NaOH溶解得到介孔四氧化三钴。用X射线粉末衍射(XRD)、透射电镜(TEM)和比表面分析对制备的材料进行表征,合成的介孔四氧化三钴最大BET比表面积为127.4 m^2·g^(-1),孔径在10-20 nm之间。在1 mol·L-1的KOH溶液中,扫描速度为5 m V·s^(-1)时,介孔四氧化三钴的析氧电位为0.392 V(vs.Ag/AgCl),表明制备的介孔四氧化三钴具有较高的电催化水氧化活性。

Mesoporous Co3O4was prepared by using CoCl2·6H2O and(NH4)6Mo7O24·4H2O as raw materials via a solution method of electrostatic self-assembly and calcinations,and dissolving Co3O4/MoO3with NaOH solution.X-ray diffraction(XRD),transmission electron microscopy(TEM)and surface area and porosity analyzer(ASAP)were used for characterization of mesoporous Co3O4.It has a high surface area of127.4m2·g-1and a mesoporous structure with a pore diameter of10-20nm.The catalytic performance for H2O electro-oxidation in KOH solution was evaluated by means of linear scan voltammetre.The catalyst presents good activities of a low onset of^0.392V(vs.Ag/AgCl)in1mol·L-1KOH at a scan rate of5mV·s-1for water oxidation.