Improving the photocatalytic hydrogen evolution of UiO-67 by incorporating Ce4+-coordinated bipyridinedicarboxylate ligands

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2019,（20）
• 页码范围: 1502-1509
• 页数: 8页
• 语种: 英文

摘要

UiO-67 is a Zr-based metal-organic framework (MOF) containing an organic linker namely,the dianion of biphenyl-4,4'-dicarboxylic acid (bpdc).Ce4+ metal ions (0.02 Ce to Zr atom ratio) were incorporated into UiO-67 via partially replacing bpdc with the dianion of 2,2'-bipyridine-5,5'-dicarboxylic acid (bpydc);thus,the latter forms a bpydc-Ce complex.The resulting product (i.e.,UiO-67-Ce) demonstrated a photocatalytic hydrogen evolution rate that was over 10 times higher than that of UiO-67.Through this modification,a new energy transfer channel is opened up.The energy transfer between the bpdc and bpydc-Ce ligands (i.e.,from excited bpdc to bpydc-Ce) weakened the recombination of the charge carriers,which was confirmed by photoluminescence,emission lifetime,and transient absorption measurements.This study presents a new way to construct highly efficient MOF photocatalysts.