A magnetically recyclable carbon nitride supported Au−Co nanoparticles (Au−Co@CN) displayed exceedingly high photocatalytic activity for hydrolysis of aqueous ammonia borane (NH 3 BH 3 , AB) solution. Combined with a synergetic effect between Au and Co nanoparticles, the Motty−Schottky effect at the metal−semiconductor interface remarkably facilitated the catalytic performance of the Au−Co@CN catalyst on the hydrolysis of AB. The TOF value of Au−Co@CN catalyst is 2897 mol H 2 mol −1 metal h −1 at 298 K under visible light irradiation, which is more than 3 times higher than that of the benchmarked catalyst, PVP-stabilized Au@Co nanoparticles.

A facile method was developed to fabricate nitrogen-doped graphene microtubes (N-GMT) with ultra-thin walls of 1-4 nm and large inner voids of 1-2 μm. The successful introduction of nitrogen dopants afforded N-GMT more active sites for significantly enhanced hydrogen evolution reaction (HER) activity, achieving a current density of 10 mA·cm -2 at overpotentials of 0.464 and 0.426 V vs. RHE in 0.1 and 6 M KOH solution, respectively. This HER performance surpassed that of the best metal-free catalyst reported in basic solution, further illustrating the great potential of N-GMT as an efficient HER catalyst for real applications in water splitting and chlor-alkali processes.

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Carbonyl‐modified carbon nitride (m‐O=C3N4) can act as a highly efficient metal‐free photocatalyst for selective oxidation reactions, as exemplified herein by the oxidative coupling of amines to imines by using dioxygen molecules and visible light. The C=O groups built‐in on the surface of the material significantly boosted the activity by following the principle of supramolecular oxidation, that is, they largely promoted the oxidation reaction at room temperature by binding in situ formed H2O2 photogenerated on the surface from the dioxygen molecules and accelerated the reaction between H2O2 and the amines.