Electrochemical measurement of triiodide diffusion coefficients in blends of ionic liquids

摘要: Abstract Triiodide diffusion coefficients were determined in two ionic liquid based electrolyte systems for dye-sensitized solar cells. The electrolytes comprised iodine, 1-methyl-3-propylimidazolium iodide ([MPIM][I]), and either 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide or trifluoromethanesulfonate. Determination of triiodide was performed by independent methods, steady-state cyclic voltammetry at ultramicroelectrodes polarization measurements thin layer cells, both temperature-dependent over a broad mixing range with varying molar ratios. strongly increase increasing temperature therefore decreasing viscosity. However, the stay almost constant [MPIM][I] mole fraction they even have maximum high fractions viscosities. Einstein–Stokes ratios fraction. So as equation is not obeyed, strong non-Stokesian charge transport can be assumed to occur systems.