N-rich covalent organic polymer in situ modified TiO2 for highly efficient photocatalytic hydrogen evolution

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2018,（6）
• 页码范围: 369-375
• 页数: 7页
• 语种: 英文

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 COPHM).During the in situ growth of COPHM on the surface of TiO2,intimate contacts between TiO2 and COPHM were built and core-shell structures were finally formed.The derived TiO2@COPHM demonstrated 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 162.7 μmol h-1 under simulated sunlight which was more than 3 times higher than raw TiO2 (51.3 μmol 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.