Research And Application Of Electrocatalytic Properties Of Metal Selcnides And Metal Sulfides

Hydrogen energy has become a hot new energy because of the abundant raw materials for hydrogen production on the earth and the advantages of environmental friendly products in the process of consumption.Among the many reactions for the preparation of hydrogen,the hydrogen evolution reaction in electrolytic water is the most environmentally friendly and promising one.At present,many researchers are working hard to develop catalysts that can improve the efficiency of hydrogen evolution reaction.Among them,the most excellent catalyst for electrolyzing water is precious metal catalyst including platinum.Although these precious metal catalysts have very strong electrocatalytic properties,they can not be widely used because of their high prices and the scarcity of earth reserves.Therefore,the research and development of efficient and cheap catalysts has become the top priority in the current energy field.At the same time,because the oxygen evolution reaction in water splitting determines the efficiency of the whole water splitting,the way to solve the oxygen evolution reaction fundamentally is also worthy of our study.In this paper,we try to do it from two aspects(1)Through hydrothermal treatment of sodium molybdate and selenium powder,we have prepared 1T phase molybdenum selenide,and through simple incorporation and reasonable design of boron,we can make electronics transfer from Mo atom to the active center of B atom and Se atom,which greatly improves the electrocatalytic activity of MoSe2.Compared with the 1T MoSe2 prepared by us,the overpotential of the B-1T MoSe2 nanoflakes decreased to 180 mV at the current density of 10 mA cm-2,the Tafel slope decreased to 50.6 mV dec-1 at the constant overpotential,and the TOF increased.(2)Because urea oxidation reaction(UOR)has lower theoretical decomposition potential than oxygen evolution reaction(OER),the change of OER in water splitting to UOR can effectively improve the efficiency of hydrogen production.Ni3S2-MoS2 heterostructure was prepared by hydrothermal method,and MoS2 is amorphous.This material has excellent electrocatalytic performance in HER and UOR.The overpotential of Ni3S2-MoS2-60 is 97 mV under the current density of 10mA cm-2 in HER.Under the current density of 10mA cm-2 in UOR,the voltage is 1.355V.