Preparation Of Transition Metal Chalcogenides Nanometrials And Study On The Performance Of Electrocatalytic Hydrogen Evolution

Hydrogen has been proposed as one of the most important clean energy in the future that could be used to power electronic devices,vehicles and homes.Although hydrogen is the most abundant element on earth,it does not exist as a free molecule.Therefore,the consequently,efficient and sustainable H2 production technologies are very important to promote the development of hydrogen energy.One direct and effective route to generate H2 is electrocatalytic hydrogen evolution reaction(HER)from water splitting,in which an efficient catalyst is required to reduce the large overpotential during the HER.The transition metal chalcogenides have been gained more attention as catalysts for the HER.Recently,lots of metal chalcogenides nanometrials have been reported as effective catalysts for HER,such as MoS2,CoS2.Herein,in this thesis,multiple transition metal alcogenides nanometrials were synthesized.The catalytic activity of the as-prepared transition metal chalcogenides nanometrials for the HER has been studied.The main contents in this thesis are as follows:(1)A facile hydrothermal approach was developed for the fabrication of novel one-dimensional hierarchical structured MoS2 without any additives or templates.Thioglycollic acid and sodium molybdate were used as the starting reagents.The reasons for the formation of the one-dimensional hierarchical structure were investigated.We also studied the performance of as-prepared MoS2 as the catalyst for HER in the acidic media.(2)Based on the previous work,in order to improve the catalytic activity of Mo S2 for the HER,Mo S2/CC composites were successfully prepared through growing MoS2 on the surface of carbon cloth(CC)by a facile hydrothermal approach.MoS2/CC composites were not only increasing the exposure of MoS2 ctatlytic active sites for the HER,but also accelerated the electron transport rate of the HER.Therefore,MoS2/CC composites have a good electrocatalytic performance for the HER in the acidic media.(3)The Co4S3 nanotubes@Ni foam composites were successfully synthesized by a two-step hydrothermal approach through the sulfurization of Co-precursor,which was previously prepared on the nickel foam(NF).We also studied the performance of catalytic activity of the products for the HER in an alkaline media.(4)Cu2-XSe@copper foam micro-nanomaterials were prepared by simple one-step hydrothermal approach using selenium powder and copper foam as the starting reagents.The influencing factors to the morphology of the products were investigated.The catalytic activity of the products for the HER was measured in the acidic media.