| Energy is the basis of human society's survival and development.With the rapid development of human society's material civilization and the massive consumption of limited fossil energy on the earth,the energy crisis has become a serious challenge for human survival and development.Solar energy is one of the effective ways to solve the energy crisis because of its clean,pollution-free,inexhaustible and inexhaustible characteristics.Therefore,the research and development of high-efficiency photocatalytic hydrogen production system has become a research hotspot in this field.This paper summarizes the current research status and problems faced by the domestic and foreign research on dye-sensitized water decomposition hydrogen production systems,and systematically summarizes the use of modified graphene-based carriers to inhibit the recombination of photogenerated electron-hole pairs to improve light Research work on the efficiency of water production and hydrogen production.Mainly involves the research content and results of the following two aspects:1.In the solvothermal process,a new method was proposed to construct a fold topology by "stitching" the separation points on graphene oxide(GO)with conjugated nitrogen atoms using the condensation reaction of ethylenediamine and oxygen-containing functional groups.This method can effectively shorten the charge transport path and improve its conjugation to obtain higher photocatalytic hydrogen production efficiency.Compared with the reference samples(GO and RGO),high conjugated corrugated graphene(HCW-GR)has higher electrical conductivity,more effective electron transfer and longer photogenerated charge life,and then visible light irradiation conditions at room temperature Next,HCW-GR-based photocatalysts show high activity and good stability in both hydrogen production and carbon dioxide reduction.Here it is recommended to list the comparative data,such as hydrogen production rate or hydrogen production amount.65.1 ?mol of hydrogen was generated within 2 h,which is about 9.6 and 3.4 times that of GO(6.8 ?mol)and RGO(19.4 ?mol)catalysts.1307.05 nmol of methane was generated in 6 hours,which is 6.2(210.42 nmol)and 3.7(349.03 nmol)times of GO and RGO catalysts,respectively.2.On the basis of the above research,using a one-step solvothermal method,four linear diamines with different carbon chain lengths(ethylenediamine,1,3-propanediamine,1,4-butanediamine,1,5-diaminopentane)four different kinds of amine condensation reaction(ACR)with GO,to build a linking group on the surface of GO,and then use this as a carrier to prepare a series of dye-sensitized photocatalytic systems(1,3-PDA-Gr,1,4-BDA-Gr and 1,5-PDA-Gr)and studied them in Hydrogen production performance under visible light irradiation.The results show that compared with the catalyst sample prepared based on GO(GO:680.21 ?mol;1,3-PDA-Gr:527.38 ?mol;1,4-BDA-Gr:418.14 ?mol;1,5-PDAGr:371.62 ?mol),GO treated with ethylenediamine ACR reaction has a corrugated structure,and the hydrogen production activity of the prepared catalyst can be increased by 1.9 times.After 2 h of reaction,the hydrogen production was 1308.6 ?mol,but the activity of the catalyst prepared by GO treated with other diamines did not show significant changes.Studies have shown that among the four diamines with different carbon chain lengths,only ethylenediamine can form conjugated functional groups on GO through ACR reaction.These functional groups can effectively shorten the charge transport path on the surface of GO,thereby enabling This catalyst system for the carrier obtains higher charge conductivity and longer exciton lifetime and exhibits high catalytic activity for hydrogen production. |
PDF Full Text Request