Molecular Engineering in D-π-A-A-Type Conjugated Microporous Polymers for Boosting Photocatalytic Hydrogen Evolution

Area of Science:

• Materials Science
• Photocatalysis
• Renewable Energy

Background:

• Conjugated microporous polymers (CMP) with donor-π-acceptor (D-π-A) or donor-acceptor (D-A) structures are promising for solar-driven hydrogen generation due to efficient charge separation and high surface area.
• Tuning the electronic structure and active sites of CMPs is crucial for enhancing photocatalytic activity.

Purpose of the Study:

• To design and investigate D-π-A-A type CMP photocatalysts.
• To understand the influence of dibenzo[b,d]thiophene-S-S-dioxide (BTDO) acceptor content on photocatalytic hydrogen generation.
• To correlate structural modifications with photocatalytic performance.

Main Methods:

• Synthesis of a series of D-π-A-A type CMPs with varying BTDO content.
• Characterization of the electronic structure and surface properties of the synthesized CMPs.
• Evaluation of photocatalytic hydrogen production rates under simulated sunlight.

Main Results:

• The BTDO content in D-π-A-A CMPs significantly impacts electronic structure, reaction site availability, and charge carrier separation.
• An optimized BTDO content in the PyT-BTDO-2 polymer enhanced light absorption, hydrophilicity, and active sites.
• The optimized PyT-BTDO-2 exhibited a high H₂ production rate of 230.06 mmol h⁻¹ g⁻¹.

Conclusions:

• The D-π-A-A structural design strategy is effective for enhancing CMP photocatalyst performance.
• Controlling acceptor content is a key factor in optimizing CMPs for solar hydrogen production.
• The developed CMP photocatalyst shows significant potential for efficient solar-driven hydrogen generation.