Dye Regeneration Kinetics of Sensitized Nickel Oxide Films under Illumination Investigated by Scanning Electrochemical Microscopy

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 (k eff ), the reduction rate constant (k red ) and absorption cross-section (Φhv) in different illumination intensity and different solvents.

Scanning Electrochemical Microscope Studies of Charge Transfer Kinetics at the Interface of the Perovskite/Hole Transport Layer

“…Tis implies that the valance band energy of the CH 3 NH 3 PbI 3 excited state lies below the NiO and PEDOT: PSS layers (ΔE < 0). Furthermore, the hole regeneration at the interface must be allowed, imposing that the valance band energy of the HTM can be more negative than that of CH 3 NH 3 PbI 3 [41,65].…”

“…Terpineol, ethyl cellulose, polycarbonate solvent, and NiO nanoparticles were purchased from Aldrich. Organic redox T_, PEDOT: PSS (Figure 1(a)), and CH 3 NH 3 PbI 3 were synthesized using the methods described in the literature [38][39][40][41]. Figure 1…”

“…For high performance, stability, and low-cost PSCs, it is crucial to investigate the charge transfer reactions of NiO/CH 3 NH 3 PbI 3 and PEDOT: PSS/MAPbI 3 layers after photo-excitation and the conductivity of CH 3 NH 3 PbI 3 deposited on both NiO and PEDOT: PSS hole transporting layers. SECM has arisen as an innovative approach for a variety of study disciplines, including biology [31], corrosion [32], energy [33,34], electron transfer processes [33], and interfacial kinetics [35][36][37][38][39][40][41][42][43].…”

Investigation on Dye Regeneration Kinetics at P‐Type Sensitized Nanoparticle Nickel Oxide Film by Scanning Electrochemical Microscopy

“…And, the FTO glass was coated with nickel acetate ethanol solution (0.05 M) by dip-coating and subsequently dried before screen printing. The photocathode films were screen printed with the NiO paste and cured for 5 min at 125 °C [35][36][37][38].…”