High-crystalline g-C 3 N 4 nanosheets (HC−CN) with reduced structural defects have been constructed through Ni-foam-induced thermal condensation because Ni-foam not only serves as a template for deposition of the 2D g-C 3 N 4 nanosheets with high surface area to prevent stacking of g-C 3 N 4 nanosheets but also acts as a catalyst to promote the polymerization and crystallization of g-C 3 N 4 via effective dehydrogenation of the −NH 2 group. The obtained HC−CN exhibits superior photocatalytic performance for H 2 evolution under visible light irradiation (λ > 400 nm), which significantly benefits from the prolonged lifetime of photogenerated charge carriers and the increase of the transfer path within 2D structures of high-crystalline g-C 3 N 4 nanosheets.

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