Synthesis Of Alkyimidazolium-based Ionic Liquids And Their Applications In Dye Sensitized Solar Cells

In this thesis,1-methyl-3-propylimidazoliumiodide(MPâ…¡), 3-hexyl-1-methylimidazolium iodide,3-ethyl-1-methylimidazolium trifluoroacetate (EMITA) were synthesized under solvent-free conditions by using Teflon-lined,stainless steel autoclaves respectively.It showed that the yield was close to 100%and the procedure was highly-efficient and eco-friendly.1-methyl-3-propylimidazolium acetate was synthesized by metathesis reaction.These four ionic liquids were applied in the electrolytes of dye sensitized solar cells respectively.The redox behavior ofâ… ₃^-/â… ^- in the electrolyte were studied by means of cyclic voltammetry for ultramicroelectrodes.The apparent diffusion coefficients ofâ… ₃^- andâ… ^- in different electrolyte were calculated on the basis of the anodic and cathodic steady-state current.The photovoltaic performance of DSCs(J_sc,V_oc,FF,η) depending on the mass-transport control ofâ… ₃^- was elucidated.The influence of 1-methylimidazole,benzimidazole,4-tert-butylpyrdine and EMITA on apparent diffusion coefficients ofâ… ₃^- andâ… ^- in the electrolyte(Electrolyte component:0.6 mol/L MPâ…¡,0.1 mol/Lâ… ₂,solvent:3-methoxypropionitrile) and the Pt counter electrode|electrolyte interface were investigated by ultramicroelectrode and electrochemical impedance spectroscopy.The photovoltaic performances of dye sensitized solar cells were compared with these addictives.EMITA increased the open voltage and fill factor while reduced the resistance of electrolytes in DSCs.