Electrochemical Rectification of Redox Mediators Using Porphyrin-Based Molecular Multilayered Films on ITO Electrodes

Area of Science:

• Electrochemistry
• Materials Science
• Supramolecular Chemistry

Background:

• Thin films are crucial for electronic devices.
• Porphyrin-based materials offer unique electronic properties.
• Controlled film construction is key for tunable conductivity.

Purpose of the Study:

• To investigate electrochemical charge transfer in multilayer porphyrin films.
• To explore current rectification properties of these films.
• To assess the impact of film thickness on conductivity and electron transfer.

Main Methods:

• Fabrication of multilayer thin films using copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) "click" chemistry.
• Electrochemical characterization of charge transfer properties.
• Measurement of interfacial electron transfer rates using hydrodynamic methods with various outer-sphere redox probes.

Main Results:

• Demonstrated current rectification in multilayer porphyrin films.
• Observed insulating properties at neutral potential, transitioning to conductivity upon oxidation.
• Quantified interfacial electron transfer rates for different redox species.

Conclusions:

• Multilayer porphyrin films exhibit tunable electrochemical properties.
• Current rectification is achievable by controlling film thickness and potential.
• These findings have significant implications for photovoltaic and photogalvanic devices.