Various Kinds Of Iron And Sulphur Compounds Prepared Via Various Synthesis Methods And Their Doping Modification

With the rapid consumption of traditional fossil energy,the development of new energy materials has attracted much attention.Sulphur and iron compounds are rich in reserves and low in price.Among pyrite has an appropriate band gap and high optical absorption coefficient,which has become an issue in research now.Pyrrhotite has unique magnetic and optoelectronic properties,which is one of the potential materials for energy storage applications.According to the research actuality of iron and sulfur compounds,this paper’s research contents can be summarized as follows:Pure phase pyrite FeS₂ is prepared by hydrothermal and solvothermal methods.Firstly,an efficient FeS precursor is employed to synthesise successfully various shapes of pyrite FeS₂,such as nanopolyhedrons,nanocubes,nanooctahedrons,and irregular nanocrystals via simple hydrothermal method by adjusting the reaction conditions.The growth mechanism of pyrite FeS₂ is discussed.Secondly,pyrite FeS₂ microspheres are prepared by an efficient and simple precursor hydrothermal method.The crystal structure,morphology and light absorption of the microspheres are characterized.Thirdly,pure phase pyrite FeS₂ nanospheres are prepared by solvothermal method.The effect of changing iron and sulfur source on the size and light absorption of the products is investigated.Silica tube vacuum encapsulation sulfuration of Fe₃O₄ nanospheres and sulfur powder is improved to synthesise successfully pure phase pyrite FeS₂.Optical and electrochemical properties of 5%Cu,Ni,and Co doped products are studied.And the effect of changing Fe₃O₄ morphology on the product is also investigated.Two methods are used to successfully prepare pyrrhotite.Firstly,flower-like pyrrhotite Fe₇S₈ superstructure is prepared by a simple hydrothermal method,and the growth mechanism of the flower-like structure is proposed.Secondly,flower-like and flake-like pyrrhotite is prepared by a microwave-assisted heating method with short reaction time.