摘要
TiO2 has been everlastingly employed as popular photocatalyst for water splitting. However, the wide band gap （3.0-3.2 eV） and poor absorption to visible light of TiO2 result in a low utilization of solar energy and limit its large-scale application. To decrease its band gap and promote the utilization of full solar energy, we here modified TiO2 by in situ growth of N-rich covalent organic polymer （termed as COPuM）. During the in situ growth of COPuM on the surface of TiO2, intimate contacts between TiO2 and COPuM were built and core-shell structures were finally formed. The derived TiO2@COPHM demon-strated a narrower band gap （2.53 eV） compared to raw TiO2 （3.13 eV） and improved absorption to visible light. The optimal TiO2@COPHM hybrid exhibited excellent hydrogen evolution performance of 162.7μmol h^-1 under simulated sunlight which was more than 3 times higher than raw TiO2 （51.3μmol h^-1）. Particularly, visible light hydrogen evolution rate of TiO2@COPHM reached 0.65 μmol h^-1 while non-hydrogen generation was observed using raw TiO2.
TiO_2 has been everlastingly employed as popular photocatalyst for water splitting. However, the wide band gap(3.0–3.2 eV) and poor absorption to visible light of TiO_2 result in a low utilization of solar energy and limit its large-scale application. To decrease its band gap and promote the utilization of full solar energy, we here modified TiO_2 by in situ growth of N-rich covalent organic polymer(termed as COPHM). During the in situ growth of COPHMon the surface of TiO_2, intimate contacts between TiO_2 and COP_(HM) were built and core-shell structures were finally formed. The derived TiO_2@COP_(HM) demonstrated a narrower band gap(2.53 eV) compared to raw TiO_2(3.13 eV) and improved absorption to visible light. The optimal TiO_2@COP_(HM)hybrid exhibited excellent hydrogen evolution performance of 162.7 μmol h^(-1) under simulated sunlight which was more than 3 times higher than raw TiO_2(51.3 μmol h^(-1)). Particularly, visible light hydrogen evolution rate of TiO_2@COP_(HM) reached 0.65 μmol h^(-1) while non-hydrogen generation was observed using raw TiO_2.
基金
supported by the National Natural Science Foundation of China(51502012,21676020,and 21620102007)
Beijing Natural Science Foundation(2162032)
the Start-up Fund for Talent Introduction of Beijing University of Chemical Technology(BUCT),Talent Cultivation of State Key Laboratory of Organic-Inorganic Composites
the Fundamental Research Funds for the Central Universities(buctrc201420,buctrc201714,and ZD1502)
the ‘‘111" project of China(B14004)
Distinguished Scientist Program at BUCT(buctylkxj02)
作者简介
Corresponding author:Zhonghua Xiang,E-mail address:xiangzh@mail.buct.edu.cn
