Ammonia-induced robust photocatalytic hydrogen evolution of graphitic carbon nitride

We report a new and effective method to prepare high activity graphitic carbon nitride (g-C3N4) by a simple ammonia etching treatment. The obtained g-C3N4 displays a high BET surface area and enhanced electron/hole separation efficiency. The hydrogen evolution rates improved from 52 μmol h−1 to 316.7 μmol h−1 under visible light.