Graphene Oxide-Enamino-Xanthene Charge-Transfer Hybrids as High-Performance Sensitizing Interfaces for TiO₂...

Area of Science:

• Materials Science
• Photochemistry
• Energy Conversion

Background:

• Advanced photoelectrochemical (PEC) energy conversion demands materials with efficient visible-light absorption and charge separation.
• Hybrid materials offer a promising strategy to overcome limitations in current PEC technologies.

Purpose of the Study:

• To synthesize and characterize novel charge-transfer hybrids of graphene oxide (GO) and enamino-xanthene (NH2-X) dyes.
• To evaluate the performance of these hybrids as sensitizing layers in TiO2 photoanodes for PEC applications.

Main Methods:

• Liquid-phase mixing for GO-NH2-X hybrid synthesis.
• Spectroscopic analyses (e.g., fluorescence) to confirm charge-transfer interactions.
• Fabrication and testing of TiO2 photoanodes sensitized with GO-NH2-X hybrids.

Main Results:

• Spectroscopic data confirmed strong interfacial interactions and ground-state charge-transfer between GO and NH2-X.
• TiO2 photoanodes with GO-NH2-X hybrids exhibited a 3.5-fold increase in photocurrent under visible light.
• Electrochemical impedance spectroscopy revealed reduced interface resistance and improved charge carrier mobility.

Conclusions:

• The synergistic integration of GO and NH2-X dyes creates a high-performance sensitizing interface for TiO2 photoanodes.
• This approach offers a scalable and environmentally friendly route for developing advanced PEC energy conversion systems.