石墨烯负载NiCoMn LDH催化剂的制备及性能研究

Preparation and Properties of Graphene Supported NiCoMn LDH Catalysts

采用具有亲水性、导电性及大比表面积的3D结构石墨烯(3DG)作为基体,用水热法制备镍钴锰层状三金属氢氧化物(NiCoMn LDH),探究制备工艺条件对NiCoMn LDH/3DG结构形貌及电催化析氧反应(OER)性能的影响。结果证明,NiCoMn以纳米片结构生长在3DG上,当添加Mn^(2+)含量为0.5mmol时,NiCoMn LDH/3DG具有较好的电催化OER性能,在1.7V下可达到10mA·cm^(-2)的电流密度,且具有更低的塔菲尔斜率。

In this paper,the 3D structure graphene(3DG)with excellent hydrophilicity,con-ductivity and large specific surface area was used as the catalyst matrix,and the catalyst of nickel-cobalt-manganese layered trimetallic hydroxide(NiCoMn LDH)was prepared by hy-drothermal method.The influence of preparation process on the structure and morphology of NiCoMn LDH/3DG,together with the performance of electrocatalytic OER was explored.The results suggest that after Mn^(2+)is added,NiCoMn could grow on 3DG with a nanosheet structure.Furthermore,when the content of Mn^(2+)is 0.5mmol,NiCoMn LDH/3DG proces-ses enhanced electrocatalytic OER performance,with current density reached 10mA·cm^(-2)at 1.7V,and exhibits a lower Tafel slope.