摘要
Polymeric carbon nitride has been widely developed as a promising photocatalyst for solar hydrogen production via photocatalytic water splitting.However,pristine carbon nitride prepared by traditional solid-state polymerization usually encounters issues such as rapid carrier recombination and insufficient absorption of visible light below 460 nm.Herein,poly(heptazine imide)with a distinctive nanoplate structure was synthesized in a binary molten salt of NaCl–CaCl_(2).The salt template allows the formation of the thin nanoplate structure,which promotes the charge separation and migration.Besides,the intercalation of Ca^(2+)ions between the conjugated layers endows the activation of n–π*electron transition due to the distortion of in-plane heptazine layers.Accordingly,the optimized poly(heptazine imide)nanoplates achieve an apparent quantum efficiency of up to 17.3%at 500 nm for photocatalytic hydrogen production from water.This work shares new idea for rational control of the optical absorption and charge carrier dynamics of poly(heptazine imide).
基金
financially supported by the National Key R&D Program of China(2021YFA1502100)
the National Natural Science Foundation of China(22032002,22172029,22311540011,22202045,22002016,and U1905214)
the 111 Project(D16008)。
作者简介
Corresponding authors:Dandan Zheng,email:ddzheng@fzu.edu.cn;Corresponding authors:Guigang Zhang,email:guigang.zhang@fzu.edu.cn。
