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Photochemical In Situ Exfoliation of Metal–Organic Frameworks for Enhanced Visible‐Light‐Driven CO 2 Reduction
Author(s) -
Zheng HuiLi,
Huang ShanLin,
Luo MingBu,
Wei Qin,
Chen ErXia,
He Liang,
Lin Qipu
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202012019
Subject(s) - exfoliation joint , catalysis , photocatalysis , materials science , visible spectrum , photochemistry , metal organic framework , selectivity , metal , in situ , ethylene , photoelectric effect , chemical engineering , nanotechnology , chemistry , optoelectronics , organic chemistry , graphene , adsorption , engineering , metallurgy
Two novel two‐dimensional metal–organic frameworks (2D MOFs), 2D‐M 2 TCPE (M=Co or Ni, TCPE=1,1,2,2‐tetra(4‐carboxylphenyl)ethylene), which are composed of staggered (4,4)‐grid layers based on paddlewheel‐shaped dimers, serve as heterogeneous photocatalysts for efficient reduction of CO 2 to CO. During the visible‐light‐driven catalysis, these structures undergo in situ exfoliation to form nanosheets, which exhibit excellent stability and improved catalytic activity. The exfoliated 2D‐M 2 TCPE nanosheets display a high CO evolution rate of 4174 μmol g −1 h −1 and high selectivity of 97.3 % for M=Co and Ni, and thus are superior to most reported MOFs. The performance differences and photocatalytic mechanisms have been studied with theoretical calculations and photoelectric experiments. This study provides new insight for the controllable synthesis of effective crystalline photocatalysts based on structural and morphological coregulation.