Research On Photoelectric Performance Improvement Of Ternary Cobalt-based Sulfide Composite With Carbon Material

Since the Industrial Revolution,the environmental burden on the planet has become heavier.As a representative of clean energy,solar energy has received extensive attention from the scientific community.In the last century,silicon-based solar cells have been vigorously developed.However,due to the complex manufacturing process of silicon-based solar cells and greater pollution after scrapping,this has seriously restricted the development of traditional silicon-based solar cells.At the end of the last century,the advent of dye-sensitized solar cells?DSSC?provided a new way for the conversion of solar energy into electrical energy.At present,in order to improve the photoelectric conversion efficiency of dye-sensitized solar cells,various laboratories have taken many measures,among which the preparation of new counter electrodes is a good attempt.The counter electrode made of ternary cobalt-based sulfide has excellent electrochemical performance and strong catalytic ability for I^-/I₃^-redox pair.Moreover,the research of new carbon materials has also entered a new stage,showing more superior electrochemical performance.In this paper,the ternary cobalt-based sulfide and new carbon materials are hydrothermally mixed to prepare a new electrode material for testing and improvement to complete the research of this topic.This thesis is divided into the following four parts:The first part draws people's research on solar cells and dye-sensitized solar cells from the urgent environmental problems.Briefly introduces the development process,components and working principle of dye-sensitized solar cells;introduces the vigorous development of electrode materials for dye-sensitized solar cells,leading to the main research in this paper is the composite material of ternary cobalt-based sulfide and carbon materials.The second part introduces the experimental drugs,experimental instruments and experimental methods used in this paper,as well as the test methods and test instruments.In the third part,CuCo₂S₄ nanomaterials synthesized by one-step hydrothermal method and CuCo₂S₄@RGO compounded by continuous and reduced graphene oxide materials?RGO?were used to test the physical properties and electrochemical properties of the two materials.Compare and explore the role of RGO in composite materials.The results show that the photoelectric conversion efficiency of CuCo₂S₄@RGO is 7.62%,which is much greater than4.99%of CuCo₂S₄,which is close to that of Pt materials.This shows that the addition of carbon materials does improve the photoelectric performance of ternary cobalt-based materials.In the fourth part,the distributed solvothermal method was used to synthesize hollow spherical SrCo2S4,and continue to synthesize carbon nanotube-introduced SrCo2S4@f-MWCNTs?SCS@f-M?and nitrogen-doped reduced graphene oxide-wrapped?N-RGO?material SrCo2S4@f-MWCNTs@N-RGO?SCS@f-M@NR?.Through testing,it was found that as the types of carbon materials increased,the photoelectric conversion efficiency of the samples increased steadily.SCS@f-M@N-R reached 8.06%,exceeding 7.51%of Pt,which shows that it is an excellent counter electrode material,which provides a theoretical basis for the application of alternative Pt materials on DSSC.