摘要
Developing low-cost and efficient catalysts for sustainable hydrogen(H2)production to the reliance on precious metal is an important trend in the future development of catalysts.Herein,a simple in-situ one-step hydrothermal strategy is employed to modify the outer layer of Ni_(3)S_(2)crystals with amorphous MoS_(2)to construct core-shell heterostructures and heterogeneous interfaces,which promotes the chemisorption of intermediates,including hydrogen and oxygen,and realizes the coupling enhancement of hydrogen-evolution reaction(HER)and oxygen-evolution reaction(OER)in alkaline water electrolysis process.In 1.0 M KOH electrolyte,the overpotentials of the electrodes are 78 mV(HER)and 245 mV(OER)at a current density of 10 mA cm^(−2),respectively.At the same time,the electrode has excellent stability for more than 100 h at a current density of 100 mA cm^(−2),due to the amorphous structure.In addition,when used as an anode and cathode to form an electrolyzer,a cell voltage of only 1.5 V is required to produce a current density of 10 mA cm^(−2).This study demonstrates that the constructed amorphous heterostructured interface synergistically promotes the dissociation of water and the adsorption of intermediates,providing a deep insight on how to accelerate the development of efficient catalysts.
基金
supported by the National Natural Science Foundation of China(No.51901110).
