| Summary: | The modulation of surface wettability and morphology are essential to optimize the photocatalytic H<sub>2</sub> evolution activity of graphitic carbon nitride (CN)-based photocatalysts. In this work, the porous hydrophilic CN/PANI heterojunction film was prepared via interfacial polymerization and loaded on a porous PCL substrate. The construction of the type-II CN/PANI heterojunction enabled an overall spectrum response and the efficient separation and transportation of photoexcited charge carriers. The fabricated CN/PANI solid-state film in comparison with its powder counterpart elevated the utilization efficiency and maintained the long-term stability of photocatalyst. The porous morphology and hydrophilic surface increased the surface area and enhanced the surface wettability, favoring water-molecule adsorption and activation. The as-prepared CN/PANI heterojunction film exhibited photocatalytic H<sub>2</sub> production activity up to 3164.3 μmol·h<sup>−1</sup>·g<sup>−1</sup>, which was nearly 16-fold higher than that of pristine CN (569.1 μmol·h<sup>−1</sup>·g<sup>−1</sup>).
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