Photocatalysts based on organic photovoltaic donor/acceptor (D/A) heterojunctions have demonstrated exceptional photocatalytic hydrogen evolution activity. This review discusses recent advancements in the molecular structural engineering of high-performance organic photovoltaic materials for their transformation into efficient photocatalysts, as well as the current challenges faced in this field.

Abstract

Over the past five years, donor/acceptor (D/A) bulk heterojunction (BHJ) photocatalysts, leveraging organic photovoltaic (OPV) materials, have witnessed remarkable progress in photocatalytic water splitting for hydrogen production. By integrating donor and acceptor materials with complementary absorption spectra, D/A BHJ photocatalysts achieve broad-spectrum light harvesting spanning from ultraviolet to near-infrared wavelengths. The nanoscale phase separation between donor and acceptor domains ensures efficient exciton dissociation, thereby enhancing solar energy conversion efficiency. In this mini-review, we explore how structural engineering strategies can transform high-performance OPV materials into efficient photocatalysts. Additionally, we highlight current challenges and provide forward-looking insights into three critical areas: hydrogen evolution rates, long-term stability, and cost-effectiveness.