Functionalized Linear Conjugated Polymer/TiO₂ Heterojunctions for Significantly Enhancing Photocatalytic H₂ Evolution

Area of Science:

• Materials Science
• Photocatalysis
• Polymer Chemistry

Background:

• Conjugated polymers (CPs) offer tunable properties for energy applications.
• Titanium dioxide (TiO2) is a cost-effective, non-toxic semiconductor with high photocatalytic hydrogen production (PHP) potential.
• Polymeric-inorganic heterojunctions for PHP are underexplored.

Purpose of the Study:

• To investigate the enhancement of photocatalytic hydrogen evolution activity by forming D-A type CP and TiO2 heterojunctions.
• To synthesize and characterize novel polymeric-inorganic heterojunctions for improved PHP.
• To elucidate the mechanism behind the enhanced performance.

Main Methods:

• Facile synthesis of TFl@TiO2, TS@TiO2, and TSO heterojunctions via in situ direct C-H arylation polymerization.
• Characterization of synthesized materials.
• Evaluation of photocatalytic hydrogen evolution rate (HER) under simulated solar irradiation.

Main Results:

• The synthesized TSO heterojunction achieved a remarkable HER of 11,220 μmol g⁻¹ h⁻¹, significantly outperforming pristine TSO and TiO2.
• The HER of TSO was approximately 5.47 times higher than pristine TSO and 1260 times higher than TiO2.
• Compatible energy levels and interfacial interactions between CP and TiO2 facilitated exciton separation and boosted PHP.

Conclusions:

• Formation of polymeric-inorganic heterojunctions effectively enhances photocatalytic hydrogen production.
• Donor-acceptor conjugated polymers coupled with TiO2 show significant promise for efficient photocatalysis.
• This work highlights the potential of CP@TiO2 heterojunctions in advancing photocatalysis for hydrogen generation.