Solar-driven tubular Co2(OH)PO4/carbon nitride S-scheme heterojunctions for renewable H2 production and CO2 reduction to solar fuels

The scalable synthesis of green chemical fuels via artificial photosynthesis represents a cornerstone strategy for buffering intermittent renewable energy and advancing global carbon neutrality. However, the practical engineering deployment of this technology is severely constrained by suboptimal solar-to-fuel conversion efficiencies at the catalytic interface. Herein, a tubular S-scheme Co 2 (OH)PO 4 @CN (CoHP@CN) heterojunction was fabricated via a pre-coordination-mediated in-situ growth strategy to facilitate solar energy harvesting. Characterizations reveal that a directional internal electric field (IEF) drives an S-scheme charge pathway, significantly reducing transfer resistance while preserving strong redox capabilities. Benefiting from these kinetic features, the heterojunction delivers exceptional solar fuel production performance, achieving a CO yield of 383.40 μmol g −1 (over 4 h) and H 2 evolution of 4657.40 μmol g −1 (within 2 h). This study underscores the power of precise interface engineering in modulating charge dynamics, offering practical insights for scalable solar-to-chemical energy storage and renewable energy deployment.