Quasi-solid state polymer electrolytes for dye-sensitized solar cells: Effect of the electrolyte components variation on the triiodide ion diffusion properties and charge-transfer resistance at platinum electrode |
| |
| Institution: | 1. Thuringian Institute for Textile and Plastics Research, Breitscheidstrasse 97, 07407 Rudolstadt, Germany;2. Fraunhofer Institute for Solar Energy Systems, Heidenhofstrasse 2, 79110 Freiburg, Germany;3. Freiburg Materials Research Center FMF, Stefan-Meier-Street 21, 79104 Freiburg, Germany;4. Friedrich-Alexander-University, Egerlandstrasse 3, 91058 Erlangen, Germany;1. Department of Physics, Faculty of Science, University of Peradeniya, Peradeniya 20400, Sri Lanka;2. Department of Chemistry, Faculty of Science, University of Peradeniya, Peradeniya 20400, Sri Lanka;3. Postgraduate Institute of Science, University of Peradeniya, Peradeniya 20400, Sri Lanka;1. Key Laboratory of Advanced Technique & Preparation for Renewable Energy Materials, Ministry of Education, Yunnan Normal University, Kunming 650500, China;2. Institute of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China;1. Department of Chemical Engineering, National Cheng Kung University, Tainan 70101, Taiwan;2. Research Center for Energy Technology and Strategy, National Cheng Kung University, Tainan 70101, Taiwan;1. Michael Grätzel Center for Mesoscopic Solar Cells, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, Hubei, PR China;2. School of Chemistry, Monash University, Clayton, VIC 3800 Australia;3. ARC Centre of Excellence for Electromaterials Science Australia;4. College of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, PR China;5. IFM, Deakin University, Burwood, VIC 3125, Australia |
| |
| Abstract: | Quasi-solid state polymer electrolytes have been prepared from poly(vinylidenefluoride-co-hexafluoropropylene) (PVDF-HFP) as gelator for 1-ethyl-3-methylimidazolium based ionic liquids (with anions like trifluoromethanesulfonate EMIM]TfO], bis(trifluoromethanesulfonyl)imide EMIM]Tf2N]) and polyacrylonitrile (PAN) for gelation of 1-ethyl-3-methylimidazolium dicyanamide EMIM]DCA] as well as I−/I3− as the redox couple. All electrolytes exhibit high ionic conductivity in the range of 10− 3 S/cm. The effect of gelation, redox couple concentration, I−/I3− ratio, choice of cations and additives on the triiodide diffusion and charge-transfer resistance of the platinum/electrolyte interface (Rct) were studied. The apparent diffusion coefficient of triiodide ion (D(I3−)) at various iodide/triiodide ratios in liquid and gelified electrolytes has been calculated from measurements of the diffusion limited current (Ilim) in electrochemical cell resembling the set-up of a dye-sensitized solar cell. The charge-transfer resistance of the platinum/electrolyte interface as well as the capacitance of the electrical double layer (Cdl) have been calculated from impedance measurements. Electrolytes with reduced content of polymer (2.5 wt.%) were doped with Al2O3 particles of different sizes (50 nm, 300 nm, 1 μm). The dispersion of the particles proceeds by speedy stirring of the hot electrolyte and the addition of PAN provides a homogeneous suspension. The addition of Al2O3 particles causes a slight increase of the triiodide diffusion constants. Furthermore the suggested enhancement of the charge transfer rate shows a dependence on the size of the particles. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
