| Electrolysis of water to produce hydrogen is one of the main methods to effectively alleviate the energy crisis and environmental pollution in the future.However,due to the high cost and scarce reserves of precious metal such as platinum,it is difficult to utilize it in large-scale industrial production.Molybdenum carbide,as one of the non-noble metal materials that have attracted wide attention in recent years,is not only a good catalyst,but also rich in raw materials.More importantly,its unique energy band structure makes it have platinum-like characteristics,which is expected to become a potential substitute for noble metal catalyst.However,the difference in catalytic performance between molybdenum carbide and precious metals makes it still a long time from its practical application.Therefore,it is significant to develop feasible route for improvnment of the molybdenum carbide’s performance.In this paper,synthesis strategies of two-dimensional（2D）material of nano-molybdenum carbide and carbon have been proposed and the relationships between the microstructure and performance have been studied.The main research results and conclusions are as follows:（1）2D nano-Mo2C/r GO composites were prepared with hydrothermal method by adjusting the feed ratio of cetyltrimethylammonium bromide（CTAB）to ammonium molybdate.The characterization results show that about 5 nm Mo2C nanoparticles are uniformly dispersed on the GO matrix and realizing N-doped.HER experiment showed that in alkaline and acid media,The current density of 10 m A cm-2 corresponds to the minimum overpotential(η10)are 112 and 176 m V,and Tafel slope are 49.9 and 59.7 m V dec-1.After1000 cycles of cyclic voltammetry（CV）scanning and 10 h continuous testing,the catalyst still maintained stable and good catalytic activity.（2）In the reaction system of glucose and ammonium molybdate,a new type of catalyst material with nano-layered structure of Mo C/Mo2C/C was synthesized by introducing boric acid.On this basis,the change rule between the morphology structure and properties of the catalyst was investigated by changing the feed ratio of raw materials.When the ratio of boric acid,glucose and ammonium molybdate is 4:1:1,the micromorphology and catalytic performance of the synthesized sample is the best.In the solution of 1 M KOH and 0.5 M H2SO4,η10 are only 100 m V and 175 m V,and Tafel slope are 44.0 and 61.5 m V dec-1.The stability test results showed that there was little difference in the performance of the catalyst.（3）2D nano-Mo O2/Mo2C/C catalyst material was prepared by using biomass（orange peel）as carbon source and combining with freeze-drying technology.When the mass ratio of orange peel to ammonium molybdate is 1:1,the micromorphology and catalytic performance of the sample is the best.In alkaline and acid electrolytes,η10 are 157 and 215 m V,and Tafel slope are 54.7 and 60.1 m V dec-1.In addition,the stability results show that in alkaline and acidic solutions,the overpotential difference after 1000 CV cycles are only 6 and 3 m V,indicating that the electro-catalytic HER of the catalyst has good stability. |
