Porous Carbon Nitride Thin Strip: Precise Carbon Doping Regulating Delocalized π‐Electron Induces Elevated Photocatalytic Hydrogen Evolution

1D strip ‐like carbon nitride (CN) with a large π‐electron conjugated system realizes the synchronization control of its electronic structure and morphology, which improves the separation efficiency of photogenerated charge carriers. Thus, such strip‐like carbon nitride exhibits a significant enhancem ent in photocatalytic activity with the hydrogen evolution rate of 126.2 µmol h−1, about 18 times higher than that of bulk CN. AbstractThe photocatalytic efficiency of polymeric carbon nitride is hampered by high carrier recombination rate and low charge transfer. Herein, these issues are addressed by constructing 1D strip ‐like carbon nitride with a large π‐electron conjugated system from carbon‐doping, realizing the synchronization control of its electronic structure and morphology. Nicotinic acid, a monomer with the carboxyl group and pyridine ring, and melamine are selected for assembling the strip‐like s upramolecular via hydrogen bond under hydrothermal process. Both peripheral pyridine unit and hydrogen bond have significant effect on self‐assembly process of nicotinic acid and melamine along one dimension to form a strip‐like precursor. Subsequently, 1D thin porous strip‐like carbon nitride is obtained by calcination treatment of precursor. The as‐prepared 1D strip‐like carbon nitride with effective π delocalization from carbon‐doping and porous structure can accelerate charges and mass transfer and provide extra active sites. Both theore...

Source: Small - February 18, 2021 Category: Nanotechnology Authors: Qi Li, Luoming Zhang, Jianan Liu, Jing Zhou, Yanqing Jiao, Xudong Xiao, Chen Zhao, Yang Zhou, Sheng Ye, Baojiang Jiang, Jian Liu Tags: Full Paper Source Type: research