skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Photoelectrochemical alcohol oxidation by mixed-linker metal–organic frameworks

Journal Article · · Faraday Discussions
DOI:https://doi.org/10.1039/d0fd00021c· OSTI ID:1833041

Metal–organic frameworks (MOFs) provide a suitable platform for stable and efficient heterogeneous photoelectrochemical oxidation catalysis due to their highly ordered structure, large surface area, and synthetic tunability. Herein, a mixed-linker MOF comprising of a photosensitizer [Ru(dcbpy)(bpy)2]2+ (bpy = 2,2'-bipyridine, dcbpy = 5,5'-dicarboxy-2,2'-bipyridine) and catalyst [Ru(tpy)(dcbpy)Cl]+ (tpy = 2,2':6',2''-terpyridine) that were incorporated into the UiO-67 framework and grown as thin films on a TiO2-coated, fluorine-doped tin oxide (FTO) electrode (RuB-RuTB-UiO-67/TiO2/FTO). When used as an electrode for the photoelectrochemical oxidation of benzyl alcohol, the mixed-linker MOF film showed a faradaic efficiency of 34%, corresponding to a 3-fold increase in efficiency relative to the RuB-UiO-67/TiO2/FTO control. Furthermore, this increase in catalytic efficiency is ascribed to the activation of RuTB moieties via oxidation by photogenerated RuIIIB. Transient absorption spectroscopy revealed the delayed appearance of RuIIITB* or RuIIITB formation, occurring with a lifetime of 21 ns, due to energy and/or electron transfer. The recovery kinetics of the charge separated state was increased (283 μs) in comparison to single-component control experiments (105 μs for RuB-UiO-67/TiO2/FTO and 7 μs for RuTB-UiO-67/TiO2/FTO) indicating a cooperative effect that could be exploited in chromophore/catalyst MOF motifs.

Research Organization:
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012446; SC0012445
OSTI ID:
1833041
Alternate ID(s):
OSTI ID: 1690284; OSTI ID: 1890488
Journal Information:
Faraday Discussions, Vol. 225; ISSN 1359-6640
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

References (35)

Real-Time Visualization of Active Species in a Single-Site Metal–Organic Framework Photocatalyst journal February 2018
Fundamental Insights into Photoelectrocatalytic Hydrogen Production with a Hole-Transport Bismuth Metal–Organic Framework journal December 2019
Doping Metal–Organic Frameworks for Water Oxidation, Carbon Dioxide Reduction, and Organic Photocatalysis journal August 2011
Finding the Way to Solar Fuels with Dye-Sensitized Photoelectrosynthesis Cells journal September 2016
Metal–organic framework materials for light-harvesting and energy transfer journal January 2015
Unexpected Roles of Triethanolamine in the Photochemical Reduction of CO 2 to Formate by Ruthenium Complexes journal December 2019
Conformal coating of ultrathin metal-organic framework on semiconductor electrode for boosted photoelectrochemical water oxidation journal December 2018
Visible Region Photooxidation on TiO 2 with a Chromophore−Catalyst Molecular Assembly journal October 1999
Photoinduced Electron Transfer in a Chromophore–Catalyst Assembly Anchored to TiO 2 journal November 2012
Photosensitizing Metal–Organic Layers for Efficient Sunlight-Driven Carbon Dioxide Reduction journal September 2018
Nonthermalized Electron Transport in Dye-Sensitized Nanocrystalline TiO 2 Films:  Transient Photocurrent and Random-Walk Modeling Studies journal November 2001
The mechanism behind the beneficial effect of light soaking on injection efficiency and photocurrent in dye sensitized solar cells journal January 2011
Photochemical Reduction of Low Concentrations of CO 2 in a Porous Coordination Polymer with a Ruthenium(II)-CO Complex journal January 2016
Incorporation of a [Ru(dcbpy)(bpy) 2 ] 2+ photosensitizer and a Pt(dcbpy)Cl 2 catalyst into metal–organic frameworks for photocatalytic hydrogen evolution from aqueous solution journal January 2015
Reductive Electron Transfer Quenching of MLCT Excited States Bound To Nanostructured Metal Oxide Thin Films journal January 2003
Rethinking Band Bending at the P3HT–TiO 2 Interface journal March 2014
Elucidating Charge Separation Dynamics in a Hybrid Metal–Organic Framework Photocatalyst for Light-Driven H 2 Evolution journal February 2018
Self-Healing of Molecular Catalyst and Photosensitizer on Metal–Organic Framework: Robust Molecular System for Photocatalytic H 2 Evolution from Water journal July 2016
Electrochemical Water Oxidation by a Catalyst-Modified Metal-Organic Framework Thin Film journal December 2016
Photocatalytic CO 2 Reduction to Formate Using a Mn(I) Molecular Catalyst in a Robust Metal–Organic Framework journal July 2015
Concentration Dependent Dimensionality of Resonance Energy Transfer in a Postsynthetically Doped Morphologically Homologous Analogue of UiO-67 MOF with a Ruthenium(II) Polypyridyl Complex journal June 2015
Ruthenium( ii )-polypyridyl zirconium( iv ) metal–organic frameworks as a new class of sensitized solar cells journal January 2016
Solvothermal Growth and Photophysical Characterization of a Ruthenium(II) Tris(2,2′-Bipyridine)-Doped Zirconium UiO-67 Metal Organic Framework Thin Film journal June 2014
Metal–organic frameworks for artificial photosynthesis via photoelectrochemical route journal October 2019
Insight into Metal-Organic Framework Reactivity: Chemical Water Oxidation Catalyzed by a [Ru(tpy)(dcbpy)(OH 2 )] 2+ -Modified UiO-67 journal January 2018
Construction of a Stable Ru–Re Hybrid System Based on Multifunctional MOF-253 for Efficient Photocatalytic CO 2 Reduction journal June 2018
Photophysics, photochemistry and solar energy conversion with tris(bipyridyl)ruthenium(II) and its analogues journal October 1982
TiO 2 Surface Functionalization to Control the Density of States journal October 2008
Light-harvesting and energy transfer in ruthenium(II)-polypyridyl doped zirconium(IV) metal-organic frameworks: A look toward solar cell applications journal July 2017
Photophysical Characterization of a Ruthenium(II) Tris(2,2′-bipyridine)-Doped Zirconium UiO-67 Metal–Organic Framework journal April 2014
The Chemistry and Applications of Metal-Organic Frameworks journal August 2013
The role of redox hopping in metal–organic framework electrocatalysis journal January 2018
A review on metal-organic frameworks for photoelectrocatalytic applications journal July 2020
Watching Photoactivation in a Ru(II) Chromophore–Catalyst Assembly on TiO 2 by Ultrafast Spectroscopy journal November 2013
Excited State Electron Transfer from Ru(II) Polypyridyl Complexes Anchored to Nanocrystalline TiO 2 through Rigid-Rod Linkers journal October 2004