期刊
SCIENCE BULLETIN
卷 64, 期 20, 页码 1502-1509出版社
ELSEVIER
DOI: 10.1016/j.scib.2019.07.030
关键词
MOFs; UiO-67; Bipyridine-tetravalent cerium; Photocatalytic hydrogen evolution; Energy transfer
资金
- National Natural Science Foundation of China [21333006, 21573135, U1832145, 11374190, 51321091, 51602179]
- Taishan Scholar Foundation of Shandong Province, China
- Young Scholars Program [2016WLJH16]
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. (C) 2019 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
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