title: Ionic liquid with a dual-redox couple for efficient dye-sensitized solar cells.
abstract: A new type of ionic liquid that contains a nitroxide radical (N-O(.)) and iodide as two redox couples, JC-IL, has been successfully synthesized for high-performance dye-sensitized solar cells (DSSCs). Both of the redox couples exhibit distinct redox potentials and attractive electrochemical characteristics. The UV/Vis absorption spectra of JC-IL shows a low-intensity peak compared to the strong absorption of I2 in the wavelength region of 350-500 nm. The high open-circuit voltage of DSSCs with JC-IL is over 850 mV, which is approximately 150 mV higher than that of the DSSCs with a standard iodide electrolyte. The dramatic increase in the standard heterogeneous electron-transfer rate constant leads to an increase in the short-circuit current for JC-IL compared to that of 2,2,6,6-tetramethylpiperidin-N-oxyl (TEMPO). DSSCs with the JC-IL electrolyte show promising cell efficiencies if coupled with dyes CR147 (8.12%) or D149 (6.76%). The efficiencies of the DSSCs based on the JC-IL electrolyte are higher than those of DSSCs based on either TEMPO electrolyte or standard iodide electrolyte alone.
authors: Department of Chemical Engineering, National Taiwan University, Taipei 10617 (Taiwan).
authors: Te-Chun
authors: TC
authors: Chu
authors: Ryan Yeh-Yung
authors: RY
authors: Lin
authors: Chuan-Pei
authors: CP
authors: Lee
authors: Chih-Yu
authors: CY
authors: Hsu
authors: Pei-Chieh
authors: PC
authors: Shih
authors: Ray
authors: R
authors: Lin
authors: Sie-Rong
authors: SR
authors: Li
authors: Shin-Sheng
authors: SS
authors: Sun
authors: Jiann T
authors: JT
authors: Lin
authors: R
authors: R
authors: Vittal
authors: Kuo-Chuan
authors: KC
authors: Ho
mesh_terms: D004396:Coloring Agents / Q000737:chemistry; D003497:Cyclic N-Oxides / Q000737:chemistry*; D011211:Electric Power Supplies; D007454:Iodides / Q000737:chemistry; D052578:Ionic Liquids / Q000737:chemistry*; D009589:Nitrogen Oxides / Q000737:chemistry; D010084:Oxidation-Reduction; D012993:Solar Energy
chemical_list: D004396:Coloring Agents; D003497:Cyclic N-Oxides; D007454:Iodides; D052578:Ionic Liquids; D009589:Nitrogen Oxides; C039900:nitroxyl; C003959:TEMPO
keywords: energy conversion; iodine; ionic liquids; radicals; redox chemistry