| The electrolytic water technology that uses renewable energy to generate electricity provides great hope for the sustainable development of hydrogen production.As an efficient and environmentally friendly electric hydrogen production technology,electrochemical water decomposition has been widely concerned as an effective way to reduce social dependence on fossil fuels.A wide range of transition metal sulfide compounds(TMD)have shown excellent performance in electrocatalysis hydrogen evolution,at the same time reasonable structural design will also be the vital to improve the efficiency of catalytic hydrogen evolution.To improve the catalytic efficiency,the structural design of rhenium disulfide and cobalt tetrasulfide as transition metal sulphides was carried out in this paper.1.Recently,the nanotechnology of atom intercalation has been developed and applied into two-dimensional(2D)materials to regulate its pristine physical property.However,as an important application in hydrogen revolution reaction(HER),the influence of alkali-metal-intercalated technology upon 2D material’s electronic structure and catalytic activity has not been sufficiently researched so far.In this work,layered ReS2 crystals with a charge decoupling are chosen as a model to explore changes in electronic structure and Gibbs free energies induced by alkali-metal intercalated compounds and external strain.The calculated results show that the structural transformation induced by intercalated alkali atom and external strain not only leads to decrease in band gap of ReS2 but also make Gibbs free energy of absorbed hydrogen close to zero.2.Cobalt sulphide(Co3S4)likes sea urchin nanoarrays was synthesized by a simple and feasible two-step hydrothermal method,and a three-dimensional structure was constructed.Then its structure and electro-catalytic properties were characterized.The hydrogen evolution reaction of the prepared electrode at 0.1 mol/L KOH electrolyte with current density of 10mA cm-2 resulted in an overpotential of 157.3 mV.The reasonable structure design along with its good conductivity,abundant electrochemical surface area,modulable coordination and electronic properties,etc.together improved its performance by 40.77%and significantly improved its electro-catalytic hydrogen evolution efficiency. |
