材料科学
光催化
氮化碳
氮化物
电荷(物理)
碳纤维
化学工程
表面电荷
纳米技术
复合材料
物理化学
有机化学
催化作用
复合数
化学
工程类
物理
图层(电子)
量子力学
作者
Yabin Jiang,Lei Zeng,Chi Cao,Wensheng Yang,Limin Huang
标识
DOI:10.1016/j.jmst.2021.08.087
摘要
• The in-planar directional charge transfer of polymeric C 3 N 4 can be realized by surface modification with ethylenediamine. • The increased -NH 2 groups induced the generation of midgap states and accumulation of electrons. • The modified C 3 N 4 exhibits excellent photocatalytic activities for hydrogen evolution and MO degradation. The random mobility of charge carriers is a main factor causing the low photocatalytic efficiency of g-C 3 N 4 . Thus, the controllable migration of charge carriers is a rational strategy to suppress the charge recombination and facilitate charge separation. Herein, an ethylenediamine modified g-C 3 N 4 displays improved photocatalytic activity. The excellent charge separation efficiency is confirmed to be a key factor for the enhancement. The TEM observation after photo-depositing Pt nanoparticles and DFT calculations verify the accumulation of electrons on some areas of g-C 3 N 4 surface. The increased -NH 2 groups significantly tune the electronic structure of g-C 3 N 4 after the modification. The generation of midgap states also affects the charge separation. Our reports provide a simple method to manage the migration of charge carriers and enable electrons directional transfer, which suppresses the recombination and improves the photocatalytic activity.
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