High-throughput Screening Study Of Metal Sulfide-modified GC 3 N 4 Visible Light Cracking Water Hydrogen Production Materials

In recent years,economic growth is increasingly dependent on the energy,environmental pollution and energy crisis has become a focus problem,so the researchers are increasingly focused on exploring and seeking clean and renewable new energy sources to replace the traditional fossil fuels.At present,it is generally believed that hydrogen is the ideal green energy for the new century.However,the traditional method of preparing hydrogen to consume a lot of energy,greatly limiting the promotion of hydrogen energy applications.Photocatalytic hydrogen production technology is that use solar energy to split the water into hydrogen,this emerging green technology attracts more scholars' attention.Research and development of efficient hydrogen production catalyst has become the core of the current research.However,there is thousand kinds of photocatalysts,the traditional method can only study one or several catalysts at one time.How to quickly find efficient catalysts from thousands of catalysts is still one of the most challenging issues in the field.The emergence of high-throughput screening technology has opened up a new way for the field of materials science research.The technology is based on the understanding of the catalytic reaction mechanism and the catalyst design,to determine the optimal structure of the catalyst in a particular catalytic reaction through combinatorial chemistry and rapid screening techniques,which has a broad application prospects.Graphite like C₃N₄?g-C₃N₄?is a new type of visible light-resistant semiconductor hydrogen production material.The new material is favored by large number of researchers because of its low cost preparation and widely source.While,the single g-C₃N₄ has a poor catalytic effect,the photocatalytic hydrogen production performance can be improved obviously by the combination of polymetallic sulphides.This research is based on the principle of high-throughput screening,and established a photocatalytic library Containing thousands of different metal sulfide composite g-C₃N₄.The hydrogen production performance of catalytic under visible light was explored,and some photocatalysts with efficient hydrogen production have screened out.The results are as follows:?1?Preparation of reaction chip:Thousands of 1 x1 mm micro-grid with special properties was prepared on a clean slide by means of glass direct printing,and a specific reaction area is set on the chip,which contains 17×17 cells.?2?The establishment of the catalyst library:In this experiment,we selected 4 kinds of metal sulfide to compound g-C₃N₄ as photocatalyst.Using four metal?Ni?Bi?Zn?Cd?,we will established C34 =4 catalyst libraries according to the method of mathematical combination,and named catalyst libraries A,B,C,D,respectively,Firstly,the g-C₃N₄ spray evenly into the grid with the spray gun,secondly,the four kinds of metal inks were printed on the chip in the corresponding position through inkjet printing technology,in addition,the chip was treated for sulfuration to synthesize sulfide-modified catalysts.?3?Detection method design:The detection method is based on the principle of bubble imaging.During the water-splitting reaction for hydrogen production,the interface of catalysts and aqueous solution will generate and grow microbubbles following the run.The bubble volume will gradually become larger during the reaction.We can record the growth process of bubbles through the digital camera to analyze the size of the bubble and achieve high-throughput screening of the purpose of the catalyst.?4?Testing and screening of catalytic materials:In this experiment,four catalyst libraries were prepared for photolysis of water.First,the reaction device was irradiated with an LED violet light having a wavelength of 395-435 nm,and then t obtain the bubble changes at different times hrough the digital camera,finally,through the professional image processing software to analyze the bubble generated.Four specific catalytic activities of the catalyst were screened out:?N10.54B10.442Zn0.17?SX/g-C₃N₄,?Ni0.37Bi0.100Cd0.53?Sx/g-C₃N₄,?NiO.12Zn0.07Cd0.81?Sx/g-C₃N₄,?Zn0.40Bi0.50Cd0.10?Sx/g-C₃N₄.?5?Control experiment and verification test:In order to investigate the catalytic performance of the selected catalyst,a comparative test and a validation test were carried out.The results show that the selected catalyst has excellent photocatalytic performance.