Silicate appended ionic liquid modified electrodes
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1 Silicate appended ionic liquid modified electrodes A. Lesniewski a, K. Szot a, J. Niedziolka-Jonsson a, M. Jonsson-Niedziolka a, C. Rizzi b, L. Gaillon b, M. Opallo a a/ Institute of Physical Chemistry Polish Academy of Sciences, Warsaw, Poland b/ Université Pierre et Marie Curie -Paris6, Paris, France mopallo@ichf.edu.pl
2 Outline Introduction (ionic liquid modified electrodes) Electrode modified with silicate appended ionic liquid Ionic liquid sol-gel precursor for layer by layer electrode film formation Conclusions
3 Introduction (ionic liquid modified electrodes)
4 Introduction time J. Wadhavan et al. J. Electroanal. Chem. 493 (2000) 75.
5 Introduction Electrodes Electrodes modified with IL drop, droplets or film Carbon paste electrodes with IL as a binder Electrodes modified with IL-CNT gel Multicomponent films or bulk materials with IL as one of the components Electrodes modified with thiol appended IL Electrodes modified with IL covalently bonded to polymer film Processes Spontaneous ion transfer Ion transfer generated by electrochemical redox reaction within IL phase Preconcentration of ions or neutral species in IL phase Electrochemical reactions of enzymes immobilised in IL phase Electrocatalysis with catalyst present in IL film. Biological systems Electrochemical formation of nanoparticles, polymers or inorganic films Over 60 papers published until September 2008!!! (90% in )
6 Introduction Ru(NH 3 ) 6 3+ Fe(CN) 6 3- Fe(CN) 6 3- Y. S. Chi et al. Langmuir 21 (2005) Y. Shen et al. Green Chem. 9 (2007) 2046.
7 Electrode modified with silicate appended ionic liquid
8 Sol-gel process OCH 3 Hydrolysis H 3 CO Si OCH 3 H + + 4H 2 O HO Si + 4CH 3 OCH 3 tetramethoxysilane (TMOS) hydrophilic silicate 2 HO Si Condensation HO Si O Si + H 2 O O Si
9 Sol-gel process substituted silicate OCH 3 Hydrolysis H 3 CO Si R H + + 3H 2 O HO Si R + 3CH 3 OCH 3 2 HO Si R Condensation HO Si O Si R + H 2 O R O Si R substituted silicate
10 Electrode modified with silicate appended ionic liquid film R HCO - catalyst OCH 3 H 3 CO Si OCH 3 1 : 9 OCH 3 Si-O-Si N + N + N + N N N Si-O-C O Si O Si O Si O Si O Si O Si * * n ITO IL appended sol-gel film Silicate confined ionic liquid A. Lesniewski et.al. Electrochem. Commun. 9 (2007) 2580
11 Electrode modified with silicate appended ionic liquid film Profilometry A. Lesniewski et.al. Electroanalysis submitted
12 Electrode modified with silicate appended ionic liquid film Permeability by voltammetry 1 mm Fc(CH 2 ) mm Ru(NH 3 ) 6 3+ Fc(CH 2 ) 2 e Fc(CH 2 ) 2 + A. Lesniewski et.al. Electroanalysis submitted
13 Electrode modified with silicate appended ionic liquid film Accumulation by voltammetry 0.1 mm Fe(CN) mm Fe(CN) 6 4- A. Lesniewski et.al. Electroanalysis submitted
14 Electrode modified with silicate appended ionic liquid film Accumulation by voltammetry 0.1 mm redox probe solution A. Lesniewski et.al. Electroanalysis submitted
15 Comparison with the electrode modified with ionic liquid precursor Accumulation by voltammetry 0.1 mm Fe(CN) 6 4- A. Lesniewski et.al. Electroanalysis submitted
16 Electrode modified with silicate appended ionic liquid submicroparticles CTAB modified Stober method d 200 nm Pore Volume (cm 3 g -1 nm -1 ) d avrg = 2.3 nm Equivalent Pore Width (nm)
17 Electrode modified with silicate appended ionic liquid submicroparticles Fe(CN) 6 3- accumulation in CPE modified with submicroparticles mm Fe(CN) j / µa cm CPE (hexadecabe) CPE (ILprecursor) CPE (hexadecane + ILappended submicroparticles) CPE (hexadecane + TMOSbased submicroparticles) Hexadecane + carbon microparticles + IL appended submicroparticles E / V vs. Ag AgCl
18 Ionic liquid sol gel precusor for layer by layer electrode film formation
19 The use of ionic liquid sol gel precusor for layer by layer electrode film formation SO 3 K. Szot et.al. J. Electroanal. Chem. In press
20 The use of ionic liquid sol gel precusor in layer by layer electrode film formation maximum 10 layers the electrostatic self assembly is followed by the formation of an inorganic polymer network!!! K. Szot et.al. J. Electroanal. Chem. In press
21 The use of ionic liquid sol gel precusor in layer by layer electrode film formation (i) ITO 210 Ω (ii) ITO + 3L 250 nm 230 Ω (iii) ITO + 5L 690 nm 240 Ω (iv) ITO + 10L 1060 nm 210 Ω capacitive current H 2 O 2 electroreduction K. Szot et.al. J. Electroanal. Chem. In press
22 The use of ionic liquid sol gel precusor in layer by layer electrode film formation (i) ITO (ii) ITO + 3L (iii) ITO + 5L (iv) ITO + 10L Fc(CH 2 ) 2 e Fc(CH 2 ) 2 + K. Szot et.al. J. Electroanal. Chem. In press
23 The use of ionic liquid sol gel precusor in layer by layer electrode film formation (i) ITO (ii) ITO + 3L (iii) ITO + 5L (iv) ITO + 10L redox liquid (tbufc) oxidation-reduction K. Szot et.al. J. Electroanal. Chem. In press
24 The use of ionic liquid sol gel precusor in layer by layer electrode film formation (i) ITO (ii) ITO + 3L (iii) ITO + 5L (iv) ITO + 10L Fe(CN) 6 3- accumulation reversible K. Szot et.al. J. Electroanal. Chem. In press
25 The use of ionic liquid sol gel precusor in layer by layer electrode film formation (i) ITO (ii) ITO + 10L, 0 min (iii) ITO + 10L, 20 min (iv) ITO + 10L, pure electrolyte 0.01 V s V s -1 ABTS 2- accumulation irreversible O 2 reduction catalysis with laccase in solution K. Szot et.al. J. Electroanal. Chem. In press
26 Acknowledgements Dr. J. Sirieix-Plenet, dr. C. Rizzi, dr. L. Gaillon (Pierre et Marie Curie Univ, Paris, France) CNRS-PAS, Polonium Dr. F. Marken (Bath, UK) Dr. J. Mrowiec-Bialon (Gliwice, Poland) Chalmers University of Technology (Goteborg, Sweden) Ministry of Science and Higher Education (Poland) project NN Electrodes modified with ionic liquids
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