As a low-and zero-carbon energy source,hydrogen energy is an important part of the future national energy system.The development of an efficient and inexpensive alkaline hydrogen evolution reaction(HER)electrocatalyst is of great significance for the large-scale preparation and utilization of hydrogen energy.In this paper,the MoO3/Ni-NiO/Nb2CTx was prepared by one-step co-electrodeposition method to loaded MoO3/Ni-NiO heterostructure on two-dimensional Nb2CTx MXene,and the obtained MoO3/Ni-NiO/Nb2CTx exhibited excellent HER performance.The XRD,SEM and TEM were conducted to analyze the surface morphology and structure of the catalysts.Results demonstrate that the MoO3/Ni-NiO heterostructure were successfully electrodeposited on the surface of Nb2CTx MXene nanosheets.The results of HER tests in 1.0 mol/L KOH electrolyte show that the MoO3/Ni-NiO/Nb2CTx at current densities of 10 and 100 mA·cm-2 has small overpotentials of 8 and 201 mV,respectively,and Tafel plot is 51 mV·dec-1.The MoO3/Ni-NiO/Nb2CTx also has good catalytic stability with almost no detectable activity decay after 20 h HER test at current densities of 10 and 50 mA·cm-2,respectively.Besides,the operando electrochemical impedance spectroscopy measurements were used to estimate electrocatalytic HER kinetics of different catalysts at overpotential from 0 to 220 mV(vs reversible hydrogen electrode(RHE)),which indicating the MoO3/Ni-NiO/Nb2CTx can effectively promote hydrolysis dissociation process and active hydrogen adsorption process,thus improving HER activity.
NETL
NSTL
万方数据
