237 senthil

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237 senthil

  1. 1. SENTHIL KUMAR KANDASAMY ASSISTANT PROFESSOR DEPARTMENT OF ECE KONGU ENGINEERING COLLEGE ERODE, TAMILNADU
  2. 2.  To fabricate supercapacitor using silver-zirconia composite as one electrode and activated carbon as another electrode and to measure the capacitance using LCR meter. Silver zirconia composite was synthesized and characterized using UV Visible spectroscopy and XRD.  Finally, the supercapacitor was fabricated and measured the capacitance using LCR meter. There were two set ups created. One is single parallel plate arrangement and another one is cascading arrangement. The capacitance value is compared. 
  3. 3.  Technology which deals with the various structures of matter having dimensions of the order of a billionth of a meter.
  4. 4.  Electrochemical Double Layer Capacitor  Energy is stored in supercapacitor by polarizing the electrolytic solution.  Electrolytic capacitor , capacitance value limited by flat surface area and      dielectric properties Energy Density: It is the amount of energy stored per unit volume or mass. The amount of energy stored is very large because of high surface area created by porous electrodes and the small charge separation created by separator. Power Density: It combines energy density with the speed that energy can be drawn out of a device. Farad: The electron storing capacity of capacitor is measured in unit Farad. One farad is approximately the charge with 6,280,000,000,000,000,000 electrons. Advantages of the supercapacitor include high energy density compared to capacitors, High power density compared to batteries, Shorter charging time, Longer cycle life , Longer shelf life, Stability, Light weight and so on.
  5. 5. Supercapacitors Batteries  Higher power density  Higher energy density  Much faster charge and  Typically, 200 – 1000 charge and     discharge rate Environmentally friendly Extremely low internal resistance or ESR High efficiency (97-98%) Over a million charge-discharge cycles discharge cycles  Contains highly reactive and hazardous chemicals  Negatively effected by low temperatures
  6. 6.  Extremely porous with a very large surface area.  Surface resembles a sponge  More electrons to be stored than other materials.  Low electronic conductivity
  7. 7.  The specific capacitance and kinetic reversibility of the composite electrodes were enhanced by addition of silver nanoparticles.  For Zirconia, porosity in the range of 2-21% and size in the range of 65-120 nm.  The mixture was subjected to physical/chemical activation in an attempt to increase the surface area and specific capacitance of the electrode.
  8. 8.  The silver colloids were synthesized by chemical reduction method. The CTAB was added to silver nitrate (0.1 M) solution and stirred. Then, the Lascorbic acid (0.1 M) was added to that solution to produce silver nanoparticles. By chemical reduction silver colloids were prepared. Then, zirconium oxalate and sodium hydroxide is mixed with the silver colloid and stirred for 24 hrs to make it as a homogeneous solution. By proper sintering temperature, silver zirconia composite were obtained. This particle can dispersed in triethanolamine and water in the ratio 1:3.
  9. 9. FTIR
  10. 10. 1 Wave Assignment Number, cm-1 483 Symmetric stretching mode of Zr-O-Zr bond, Zr-O vibration, Strong absorption attributed to tetragonal zirconia. Monoclinic ZrO2, O-Zr-O Zr-O stretching vibration 2 660 IR active fundamental mode of ZrO2 , Asymmetric stretching mode of Zr-O-Zr bond Zr-O bond Si-O-Ag bond 3 4 797 907 5 6 7 8 1110 1288 1426 1684 Zr-O bond Zr-O bond Si-O-Ag bond Bending vibration of C-H C-C bond Absorption bond of NO3 Stretching vibrations of the OH groups H-O-H bending vibrations C-O bond 9 3395 Bending vibrations of the OH groups Bending vibrations of the OH band due to absorbed water molecules References 470, V. Eswaranand and T. Pradeep, 2002. 470, Luis A. P´erez-Maqueda and Egon Matijevi et al, 1997. 471, Guorong Duan et al,2008 506, W.T. Tang et al, 2010. 400-500, Zijun Zhang et al,2011 450, Zijun Zhang et al,2011 653, A. Sreekumaran Nair et al, 2004. 650, V. Eswaranand and T. Pradeep, 2002. 650, Zijun Zhang et al,2011 670, Chang Sool kim et al,2008 833, Zijun Zhang et al,2011 937, Zijun Zhang et al,2011 889, Chang Sool kim et al,2008 1122,Shaoxu Wang et al,2006 1284, Zijun Zhang et al,2011 1387, Chang Sool Kim et al,2008 1634, S. Jayakumar et al, 2011, Zijun Zhang et al, 2011. 1645, Chang Sool Kim et al,2008 1597, Zijun Zhang et al,2011 3419, Guorong Duan et al,2008 3426,S. Jayakumar et al, 2011, Zijun Zhang et al, 2011.
  11. 11. XRF Analysis Element Analysis Element Weight,% Using EDX 720. 1 Zr K 92.114 It is used to measure 2 Si K 5.763 the weight 3 Hf L 1.306 4 Ag K percentage of the 0.605 5 Ti K 0.211 individual elements. Analysis performed before calcination.
  12. 12. XRD Broad peak at 27 degree which confims the amorphous nature of the as prepared composite.
  13. 13. AFM Surface roughness.
  14. 14. Supercapacitor setup Electrode Activated Carbon and Silver Zirconia Composite Electrolyte – KI Separator – Whatman Paper
  15. 15.  Asymmetric supercapacitor developed successfully     using silver zirconia composite as one electrode and activated carbon as another electrode in KI electrolyte Asymmetric supercapacitor can exhibit maximum energy density. Two layers consisting of nanoporous electrodes Separator is impregnated with an organic electrolyte Thin separator can only withstand low voltages
  16. 16. Dielectric constant of medium X area of the plate  Capacitance = ---------------------------------Distance between the plates
  17. 17. Capacitance measurement Measured using LCR S.No Capacitor Arrangement Electrolyte Capacitance meter. Compared to single 1 Single parallel plate capacitor KI 1 F to 12 F parallel plate capacitor , cascading 2 Cascading arrangement KI 33 F to 180 F arrangement of supercapacitor gives the better result.
  18. 18.  Silver zirconia composite was synthesized and characterized using UV Visible spectroscopy and XRD. Finally, the supercapacitor was fabricated and measured the capacitance using LCR meter. For single setup the capacitance range varies between 1 F to 12 F. But for cascading arrangement the capacitance value drastically varies in between 33 F to 180 F.

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