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Metal doping in cerium metal-organic frameworks for visible-response water splitting photocatalysts

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.5043538· OSTI ID:1507012
 [1];  [2];  [2]
  1. Univ. of Minnesota, Minneapolis, MN (United States). Minnesota Supercomputing Inst., Chemical Theory Center, Dept. of Chemistry; Nanoporous Materials Genome Center
  2. Univ. of Minnesota, Minneapolis, MN (United States). Minnesota Supercomputing Inst., Chemical Theory Center, Dept. of Chemistry
Cerium metal-organic frameworks (MOFs) show great promise for photocatalytic water splitting as they have low-lying unoccupied 4f orbitals with energies lower than the unoccupied linker orbitals to drive the ligand-to-metal charge transfer (LMCT) of the photo- generated electron at the linker to separate the photo-excited charges. Nevertheless, the large and negative LMCT energies of Ce-MOFs are often accompanied by high photon-absorption energies, which then limits the application of Ce-MOFs as visible-light-driven water splitting photocatalysts. In this work, we propose that metal (Zr or Ti) doping can raise the very negative LMCT energies of Ce-MOFs, consequently leading to the decrease of the absorption energy and promoting the response of Ce-MOFs to visible light. By functionalizing the linker of the mixed-metal MOFs, we found two possible visible-response photocatalysts for water splitting using a single photocatalyst.
Research Organization:
Univ. of Minnesota, Minneapolis, MN (United States). Nanoporous Materials Genome Center
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
SC0008688
OSTI ID:
1507012
Journal Information:
Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 4 Vol. 150; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Computational Studies of Photocatalysis with Metal–Organic Frameworks journal September 2019
Mixed-metal metal–organic frameworks journal January 2019
Cerium-based UiO-66 metal–organic frameworks explored as efficient redox catalysts: titanium incorporation and generation of abundant oxygen vacancies journal January 2019
Special Topic on Interfacial Electrochemistry and Photo(electro)catalysis journal January 2019

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