Controllable Fabrication Of Low-dimensional Molybdenum Base Nanostructures Material And Electrocatalysis Performance Study Of Hydrogen Evolution Reaction

At present,energy and environmental problems have affected human survival and development.Therefore,developing a new type of green energy to replace traditional fossil fuel is the only way to solve these problems.Hydrogen is a type of new energy with high energy density,environmental friendly,abundant resources,renewable sources,so it is seen as an ideal fuel to replace traditional fossil fuels.Recently,electro-catalysis to hydrogen evolution reaction（HER）has gotten more and more attentions because of its high hydrogen yield and environmental protection.But the best performance catalyst,Pt,has few reserves and high price which limits the promotion of the hydrogen production methods.As a result,developing a cheap and efficient catalyst is the key to solve the problem.In the present study of non-noble metal catalysts,many substances with the ability of HER were found.And molybdenum-based materials have attracted much attention due to its remarkable performance.In this thesis,we will proceed from molybdenum-based materials,synthesizing a series of molybdenum-base pure compounds and molybdenum-based hybrid materials which have certain morphology.Then,we will study the electric catalytic performance properties of HER.In this thesis,our research mainly includes the following three parts:（1）We use a simple reaction of（NH4）6Mo7O₂4 and amine,creating MoO₃-EDA with one-dimensional structure.First,it is thermal-treated in the air.It is then heated in Ar/H2 atmosphere and MoO₂ with two-dimensional structure is obtained.In the test of catalytic activity of HER,materials formed in 600 ℃ perform better because it has a better crystalline.At the overpotential of 300 mV,its current density reaches 15mA/cm2.At the same time,it also has a good stability.（2）Based on MoO₃-EDA with one-dimensional structure,we create an one-dimensional MoO₂ nanorods.We then grow a layer of MoS₂ on the surface of MoS₂.In the test of catalytic activity of HER,MoO₂-MoS₂ hybrid nanorods has better performance than MoO₂.And the sample of MoO₂/S-12-3 performs the best.Its current density reached 10mA/cm2 at the overpotential of 210 mV.At the same time,it is also stable.（3）MoO₃-EDA is annealed in reducing atmosphere,and one-dimensional MoC and a series of one-dimensional Mo/MoC are obtained at different processing temperatures.In the catalytic activity test of HER,Mo/MoC hybrid nanorods has better performance than MoC does.The electric current density of Mo/MoC hybrid nanorods（formed in 700 ℃）can reach to 51.5 mA/cm2 under electric potential of-200mA which shows that the hybrid structure did develop its performance.And in the test of catalytic activity of HER,it is found that it also possesses fine stability.