Abstract
Scanning electrochemical microscopy (SECM) feedback mode has been used to investigate regeneration kinetics on P1 (4-(bis-{4-[5-(2,2-dicyanovinyl) thiophene-2-yl] pH-enyl} amino) benzoic acid) dye sensitized nickel oxide (NiO) electrodes in contact with reduced iodide liquid electrolyte in different electrolyte solvents. We were used acetonitrile, ethanol, methanol and propylene carbonate solvents for comparison under illumination of different wavelengths. We found significant variation of regeneration kinetics parameters such as regeneration rate constant (keff), the reduction rate constant (kred) and absorption cross-section (Φhv) in different illumination intensity and different solvents.
Highlights
Over the past decades, dye-sensitized solar cells (DSSCs) emerged as a new innovative technology for development of environmentally clean and low-cost energy source
We found significant variation of regeneration kinetics parameters such as regeneration rate constant, the reduction rate constant and absorption cross-section (Φhv) in different illumination intensity and different solvents
We were measured Scanning electrochemical microscopy (SECM) approach curve of P1/nickel oxide (NiO) sample at different illumination intensities to explore the influence of light wavelength on dye regeneration
Summary
Dye-sensitized solar cells (DSSCs) emerged as a new innovative technology for development of environmentally clean and low-cost energy source. Dye sensitization p-type semiconductors with mesoporous, NiO-based protective electrode get much interest research due to the development of new materials. Upon light absorption of the dye, the frequency of the charge-transfer reaction of the photo chemically reduced dye molecules to the electrolyte must be competitive with the tremendously fast charge recombination process between the reduced dye molecules and injected holes in the NiO electrode. Investigation of dye regeneration on DSSCs has been performed by spectroscopy, photo electrochemistry characterization of individual electrode and by nanosecond transient absorption spectroscopy (TAS), which provides valuable information about the regeneration of sensitized solar cells [16] [17] [18]. We explore the effects solvent on the regeneration kinetics of P1 dye (molecular structure as shown in Figure 1(a)) with reduced iodide electrolyte (I−) in different illumination in different electrolyte solvents, such as acetonitrile, methanol, ethanol and propylene carbonate respectively
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