光催化
石墨氮化碳
化学
氮化碳
催化作用
化学工程
分解水
电子转移
纳米技术
材料科学
光化学
氢
碳纤维
氮化物
图层(电子)
有机化学
复合数
复合材料
工程类
作者
Daming Zhao,Jie Chen,Chung‐Li Dong,Zhou Wu,Yu‐Cheng Huang,Samuel S. Mao,Liejin Guo,Shaohua Shen
标识
DOI:10.1016/j.jcat.2017.06.020
摘要
Two-dimensional graphitic carbon nitride (g-C3N4) nanosheets (CNNS) have attracted intense interest in photocatalysis, given their small thickness and high specific surface area favoring charge transfer and surface reactions. Herein, a facile strategy of breaking and following repolymerizing the heptazine units in bulk g-C3N4 (BCN) is developed to synthesize ultrathin CNNS with thickness of 1 nm in relatively high product yield (∼24%). The as-prepared 1 nm-thick CNNS show significantly enhanced photocatalytic performance for hydrogen evolution than BCN and even the 3 nm-thick CNNS acquired by thermal oxidation etching of BCN. It is evidenced that the disordered layer structure of the obtained ultrathin CNNS causes strong interlayer CN interaction, tunneling electron transport between the CN layers. Meanwhile, the broken in-plane CN bonds create more unsaturated N sites in the 1 nm-thick CNNS, facilitating the electron excitation from the occupied states in g-C3N4 to its unoccupied states for water reduction reaction.
科研通智能强力驱动
Strongly Powered by AbleSci AI