Journal article

Development of hybrid organic-inorganic materials for efficient charging/discharging in electrochemical and photoelectrochemical capacitors

A composite system of poly (3,4-ethylenedioxythiophene)/multi-walled carbon nanotubes has been investigated and characterized as a potential charge storage material for coupled dye-sensitized solar cell/electrochem. capacitor systems. The selected material can easily operate in org. media (lithium triflate/propylene carbonate) giving a specific capacitance of 95 F g-1 and energy d. of 3.1 Wh kg-1. The combination of the composite material with dye-sensitized solar cell allows to obtain a photo-rechargeable supercapacitor (photocapacitor), destined to work with dies required org. media (here with N 719 dye). The photocapacitor system was built from mesoporous TiO2 electrode, typical charge relay consisting of iodine/iodide redox couple and two charge storage electrodes sepd. by a liq. electrolyte. The system was tested under light illumination of 100 mW cm-2 with xenon lamp equipped with cut-off filters eliminating the UV and IR part of the spectra.


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