Enhanced electron density of the π-conjugated structure and in-plane charge transport to boost photocatalytic H2 evolution of g-C3N4

Graphite carbon nitride (g-C3N4) has become an emerging metal-free photocatalyst and attracted the attention of researchers. However, pure g-C3N4 (PCN) prepared by traditional thermal condensation polymerization a low heptazine ring chains large number charge recombination centers, which hinder in-plane transport, leading to undesirable photocatalytic performance. Herein, PCN fabrication treatment with ammonium oxalate monohydrate was performed produce highly dispersed porous nanosheets, integrity their successfully improved without introducing heteroatoms. Electron paramagnetic resonance 13C nuclear magnetic analyses revealed significantly increased electron density delocalization π-conjugated structure. The obtained samples exhibited acceptable stability activity, hydrogen reduction rates Pt co-catalyst were 11.2 5.3 times that PCN.