Nitrogen Modified Linear Polythiophene Derivatives with Polarized Charge Distribution for Red Light‐Induced Photocatalysis

Abstract Elevating the long‐wavelength activation of photocatalysts represents a formidable approach to optimizing sunlight utilization. Polythiophene (PTh), although renowned for its robust light absorption and excellent conductivity, is largely overlooked for its potential as a photocatalyst due to the swift recombination of photogenerated charge carriers. Herein, we unveil that the strategic introduction of an aromatic ring containing varying nitrogen content into PTh instigates polarized charge distribution and facilitates the narrowing of the band gap, thereby achieving efficient photocatalytic activities for both hydrogen and hydrogen peroxide generation. Notably, the best sample, PTh‐N2, even demonstrates photocatalytic activity in the red light region (600–700 nm). This study offers a promising avenue for the development of polymer photocatalysts with efficient photocatalytic performance for red light‐induced photocatalysis.