Catalytic and Surface‐Electrocatalytic Water Oxidation by Redox Mediator–Catalyst Assemblies

Concepcion, Javier J.; Jurss, Jonah W.; Hoertz, Paul G.; Meyer, Thomas J.

doi:10.1002/anie.200901279

Cited by 158 publications

(109 citation statements)

References 10 publications

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“…Measurement of oxygen produced has not yet been reported for the TiO 2 -bound molecular assembly, but catalytic current was seen for the [Ru(Mebim 2 py)(4,4’-(CH 2 PO(OH 2 ) 2 ) 2 (bpy))(OH 2 )] 2+ catalyst without the chromophore on a nano ITO surface [183]. …”

Section: Catalysis For Light-driven Water Oxidationmentioning

confidence: 99%

Light-driven water oxidation for solar fuels

Young

Martini

Milot

et al. 2012

Coordination Chemistry Reviews

353

314

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Light-driven water oxidation is an essential step for conversion of sunlight into storable chemical fuels. Fujishima and Honda reported the first example of photoelectrochemical water oxidation in 1972. In their system, TiO2 was irradiated with ultraviolet light, producing oxygen at the anode and hydrogen at a platinum cathode. Inspired by this system, more recent work has focused on functionalizing nanoporous TiO2 or other semiconductor surfaces with molecular adsorbates, including chromophores and catalysts that absorb visible light and generate electricity (i.e., dye-sensitized solar cells) or trigger water oxidation at low overpotentials (i.e., photocatalytic cells). The physics involved in harnessing multiple photochemical events for multielectron reactions, as required in the four-electron water oxidation process, has been the subject of much experimental and computational study. In spite of significant advances with regard to individual components, the development of highly efficient photocatalytic cells for solar water splitting remains an outstanding challenge. This article reviews recent progress in the field with emphasis on water-oxidation photoanodes inspired by the design of functionalized thin film semiconductors of typical dye-sensitized solar cells.

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Section: Catalysis For Light-driven Water Oxidationmentioning

confidence: 99%

Light-driven water oxidation for solar fuels

Young

Martini

Milot

et al. 2012

Coordination Chemistry Reviews

353

314

View full text Add to dashboard Cite

show abstract

“…For example,M eyer and co-workersl ater demonstrated the electrocatalytic water oxidation of an adsorbed m-oxo-bridgedr uthenium complex, [49] as well as single-site ruthenium complexes using phosphonates as the anchoring groups ( Figure 6). [58][59][60][61] Although the turnover at smalloverpotential is not satisfactory, the authors demonstrated the importance of using ar edox mediator, [58,60] PCET, [58] and as ingle ET activation of multiple ETs/watero xidation. [49] Further details on the photoelectro-chemicalo xidation of water on the surfaces of metal oxide electrode materials are discussed in alater section.…”

Section: Electrocatalytic Water Oxidationmentioning

confidence: 99%

Artificial Molecular Photosynthetic Systems: Towards Efficient Photoelectrochemical Water Oxidation

Yamamoto

Tanaka

2016

ChemPlusChem

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Artificial photosynthesis is of great importance in the production of clean fuels such as hydrogen from sunlight and water. In such systems, water oxidation is kinetically demanding; therefore, efficient catalysts and systems for water oxidation are required. Among the artificial systems, photosynthesis has been recently developed owing to the emergence of efficient molecular catalysts for water oxidation. This Review highlights several important concepts including electron transfer and catalysis, and the representative systems of molecular systems for visible‐light‐driven water oxidation. In addition, the remaining challenges in this field, including the interfacial recombination and the restricted utilization of visible light of over 500 nm, are discussed.

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“…The example shown is also impressive as a catalyst both in terms of rate and stability with no sign of deterioration after 28 000 turnovers. An electrochemical study of the surface-bound catalyst reveals a mechanism analogous to the single-site mechanism in Scheme 6 with the surface RuIII/II couple appearing at 1.33 V in 0.1 M HNO 3 [63].…”

Section: Chromophore Catalyst Assemblies On Oxide Surfacesmentioning

confidence: 93%

Making solar fuels by artificial photosynthesis

Song

Chen

Brennaman

et al. 2011

Pure and Applied Chemistry

126

110

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Abstract:In order for solar energy to serve as a primary energy source, it must be paired with energy storage on a massive scale. At this scale, solar fuels and energy storage in chemical bonds is the only practical approach. Solar fuels are produced in massive amounts by photosynthesis with the reduction of CO 2 by water to give carbohydrates but efficiencies are low. In photosystem II (PSII), the oxygen-producing site for photosynthesis, light absorption and sensitization trigger a cascade of coupled electron-proton transfer events with time scales ranging from picoseconds to microseconds. Oxidative equivalents are built up at the oxygen evolving complex (OEC) for water oxidation by the Kok cycle. A systematic approach to artificial photo synthesis is available based on a "modular approach" in which the separate functions of a final device are studied separately, maximized for rates and stability, and used as modules in constructing integrated devices based on molecular assemblies, nanoscale arrays, self-assembled monolayers, etc. Considerable simplification is available by adopting a "dyesensitized photoelectrosynthesis cell" (DSPEC) approach inspired by dye-sensitized solar cells (DSSCs). Water oxidation catalysis is a key feature, and significant progress has been made in developing a single-site solution and surface catalysts based on polypyridyl complexes of Ru. In this series, ligand variations can be used to tune redox potentials and reactivity over a wide range. Water oxidation electrocatalysis has been extended to chromophorecatalyst assemblies for both water oxidation and DSPEC applications.

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Catalytic and Surface‐Electrocatalytic Water Oxidation by Redox Mediator–Catalyst Assemblies

Abstract: We recently described single-site catalysts for water oxidation that operate by a well-defined mechanism involving stepwise three-electron oxidation to high-oxidation-

Cited by 158 publications

References 10 publications

Light-driven water oxidation for solar fuels

Light-driven water oxidation for solar fuels

Artificial Molecular Photosynthetic Systems: Towards Efficient Photoelectrochemical Water Oxidation

Making solar fuels by artificial photosynthesis

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