Photocatalytic Reforming of Methanol over Poly Heptazine Imide: Interlayer Stacking Modification Induced Rapid Charge Transfer

As a crystalline allotrope of carbon nitrides, poly(heptazine imide) (PHI) exhibits great potential for photocatalytic biomass conversion. However, its activity is greatly constrained due to insufficient charge migration and severe non‐radiative recombination. To address this issue, PHI with high interlayer stacking orderliness is fabricated through a facile ion exchange strategy. Characterizations reveal that rational modification of the interlayer stacking mode of PHI could efficiently suppress non‐radiative recombination and improve charge transfer efficiency. Accordingly, the optimal sample exhibits high photocatalytic reforming activity for H2 evolution, which is up to 2.16 mmol·g‐1·h‐1, and with a quantum efficiency reaches 26.7 % at 400 nm.