Synthesis Of Phosphorus And Nitrogen Co-Doped Mesoporous Carbon/Metal Phosphide Composite And Its Electrocatalytic Hydrogen Production Performance

Due to the limited reserves and rapid consumption of fossil energy,the increasing demand for energy has become a major challenge for the sustainable development of society.Excessive consumption of fossil fuels will have adverse effects on the surrounding environment,such as air pollution and greenhouse effect.At present,there are obvious disadvantages in environment and energy,so reducing the use of traditional fossil fuels is an important issue that needs to be studied and discussed in the current scientific research field.Hydrogen is the most promising energy source in the future.Hydrogen has the advantages of non-toxicity,high stability,environmental friendliness and high energy density,and is considered as the most promising energy candidate for providing clean energy in the future.Compared with other hydrogen production methods,electrolyzed water does not need coal fuel,and the use of efficient catalysts can reduce energy consumption and electrolyze water with high efficiency,which has attracted more and more attention.However,electrolytic water has the disadvantage of consuming too much energy,and the use of efficient catalysts can reduce energy consumption.This catalyst has the best catalytic effect,but because of its high price,it is necessary to find cheaper and more efficient electrocatalysts.In this paper,nitrogen atoms and phosphorus atoms were introduced into electrocatalyst by a simple method.These composites have the advantages of low price,easy operation and good stability.The structural composition and hydrogen production characteristics were further analyzed and studied.This paper consists of the following three parts:1.Co,P and N co-doped mesoporous carbon materials were prepared from glucose,melamine,cobalt chloride hexahydrate and diammonium hydrogen phosphate.By manually grinding the above drugs evenly in a mortar,introducing argon into a tubular furnace,and roasting at 900℃,the synthesized catalyst has a mesoporous structure,and different proportions will affect the structure and performance of the sample.Sample G6.0M2.0Co5.0 has an overpotential of 180 m V when the current density reaches 10 m A cm^-2 under alkaline conditions,and 172 m V under acidic conditions.2.Co-doped mesoporous carbon materials were synthesized by using salt as template.Glucose is used as carbon source,urea as nitrogen source,Co Cl2·6H2O as cobalt source and diammonium hydrogen phosphate as phosphorus source.Using inorganic salt Na Cl as template.The mass ratio of salt to precursor can affect the porosity of the sample.The overpotential of the sample GUCo-0.2Na Cl is the lowest,and the overpotential of the sample GUCo-0.2Na Cl is 168 m V when the current density is 10 m A cm^-2 in alkaline electrolyte solution,and it has the best stability.3.Mesoporous carbon materials co-doped with Mo,N and P were synthesized by a simple solvent-free method.Glucose,molybdenum trioxide（Mo O₃）and diammonium hydrogen phosphate（（NH₄）₂HPO₄）were evenly mixed according to a certain mass ratio and calcined in a tubular furnace.Among the samples prepared,the best electrocatalyst was G6.0U2.0Mo4.0,which showed good hydrogen evolution reaction activity in acidic and alkaline electrolyte solutions and almost no activity loss after 10 h stability test.