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    Carbon nanotube/manganese oxide thin film composites-based counter electrode for dye-sensitized solar cell
    (2016-01-01)
    Nathakreat, Ketama
    ;
    Wirat, Jarernboon
    ;
    Winadda, Wongwiriyapan
    Manganese oxide thin film sandwiched between carbon nanotubes thin films-coated on fluorine-doped tin oxide (FTO/CNT/MnO<inf>x</inf>/CNT) was used as a counter electrode of dye-sensitized solar cell (DSSC) for performance improvement. The multi-layer electrodes were fabricated by sequential process comprising doctor-blade coating of CNT layer and the following electroplating coating of MnO<inf>x</inf> layer and subsequent doctor-blade coating of CNT layer once again. The multi-layered counter electrode of CNT/MnO<inf>x</inf>/CNT exhibited the improved conversion efficiency and a fill factor of 2.01±0.01% and a fill factor of 0.55±0.01, respectively, due to an increase in capacitance of the electrode. Electrochemical impedance spectra (EIS) show that the capacitance of multi-layered CNT/MnO<inf>x</inf>/CNT electrode increased from 22±3 μF to 41±2 μF comparing to that of a monolayer of CNT. Furthermore, EIS of FTO/CNT/MnO<inf>x</inf>/CNT-based DSSC shows the smallest radius of the semicircle with a charge transfer resistance of 42 ω, implying a quick redox reaction between counter electrode and electrolyte. The improved fill factor is likely due to the role of MnO<inf>x</inf> that increases the capacitance of electrode and reduces electron transfer rate from counter electron to electrolyte.
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    Optimization of TiO 2 nanoparticle mixed PEDOT-PSS counter electrodes for high efficiency dye sensitized solar cell
    (2012-09-01)
    Maiaugree, Wasan
    ;
    Pimanpang, Samuk
    ;
    Towannang, Madsakorn
    ;
    Saekow, Saman
    ;
    Jarernboon, Wirat
    Poly(3,4-Ethylendioxythiophene)-Poly(Styrene Sulfonate) (PEDOT-PSS) mixed with titanium dioxide (TiO <inf>2</inf>) nanoparticles was coated on conductive glass substrate by a doctor blading method and used as dye-sensitized solar cell (DSSC) counter electrodes. The energy conversion efficiency is significantly improved after TiO <inf>2</inf> nanoparticle incorporation. This improvement is attributed to an increase in counter electrode catalytic activity and a decrease in counter electrode charge transfer resistance. These phenomena were observed using Cyclic Voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS), respectively. The efficiency of polymer-TiO <inf>2</inf> based DSSCs varied with the ratio of small (∼ 25 nm) to large (∼ 100 nm) TiO <inf>2</inf> nanoparticles. The highest efficiency (∼ 8.49%) was obtained with a ratio of 30% large to 70% small (wt/wt) nanoparticles inTiO <inf>2</inf> electrodes. This efficiency is superior to that of Pt DSSC (∼ 7.50%). © 2011 Elsevier B.V.