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The in situ electropolymerized-polyaniline (PANI) film (thickness: 5–20 l m) on FTO (fluorine tin oxide) glass doped by various counterions SO2-4, ClO-4 ,BF-4,Cl-, p-toluenesulfonate (TsO-), etc. was prepared with electropolymerized charge capacity of 50–600 mC cm-2. Different doping counterions have great impact on the morphology, electrochemical activity of electropolymerized-PANI film. The electropoly-merized-PANI doped by SO24 anion (PANI-SO4) film with much porous morphology and pore size diam-eter of several micrometers possesses higher reduction current for reduction of I-3 and a low charge-transfer resistance of 1.3 Ω cm2 in comparison with Pt as counter electrode (CE). Dye-sensitized solar cell with PANI-SO4 as CE was assembled, and the device under full sunlight illumination (100 mW cm-2,AM1.5 G) shows 5.6% photovoltaic conversion efficiency, which is comparable to 6.0% of that with Pt CE under the same experimental condition.

Keywords: Dye-sensitized solar cell; Polyaniline; Electropolymerization; Counter electrode

★★★★☆ Li ZP,Ye BX,Hu XD,et al. Facile Electropolymerized-pani As Counter Electrode For Low Cost Dye-sensitized Solar Cell[J]. Electrochemistry Communications,2009,11:1768-1771.

Environmentally friendly and effective removal of Br and Cl impurities in hydrophilic dialkylimdazolium or butylpyridinium ionic liquids was investigated and developed at room temperature to 80 C and atomspheric pressure. Constant elelctrolysis was applied to oxidize Br and Cl to their corresponding Br2 and Cl2, then the BF 4 and NO 3 ions from HBF4 and HNO3 solution in the cathode zone move to anode zone through an anion exchange membrane and combine with dialkylimdazolium or butylpyridinium cation to form ionic liquids. The Br2 and Cl2 in electrolyzed ionic liquids are treated with ethylene to afford the corresponding 1,2-dibromo (or dichloro) ethane which could easily be removed by volatilisation under vacuum (ca. 10 mm Hg). Removal of Br and Cl impurities (0.94–4.47 wt%) from hydrophilic dialkyl imdazolium or butylpyridinium ionic liquids through electrolysis and ethylene treatment could be achieved at 0.06%–0.29% without any additional solvents and ionic liquid loss.

Keywords: Electrolysis; Ionic liquid; Bromide; Chloride; Removal

★★★★☆ Li ZP,Du ZY,Gu YL,et al. Environmentally Friendly And Effective Removal Of Br And Cl- Impurities In Hydrophilic Ionic Liquids By Electrolysis And Reaction[J]. Electrochemistry Communications,2006,8:1270-1274.