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Author: search.filters.author.Nathakreat, KetamaSubject: search.filters.subject.Counter electrode

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    Item type:Publication,
    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.