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Title: Molecular Photoelectrode for Water Oxidation Inspired by Photosystem II

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.9b02548· OSTI ID:1566599

In artificial photosynthesis, the sun drives water splitting into H2 and O2 or converts CO2 into a useful form of carbon. In most schemes, water oxidation is typically the limiting half-reaction. Here, we introduce a molecular approach to the design of a photoanode that incorporates an electron acceptor, a sensitizer, an electron donor, and a water oxidation catalyst in a single molecular assembly. The strategy mimics the key elements in Photosystem II by initiating light-driven water oxidation with integration of a light absorber, an electron acceptor, an electron donor, and a catalyst in a controlled molecular environment on the surface of a conducting oxide electrode. Visible excitation of the assembly results in the appearance of reductive equivalents at the electrode and oxidative equivalents at a catalyst that persist for seconds in aqueous solutions. Steady-state illumination of the assembly with 440 nm light with an applied bias results in photoelectrochemical water oxidation with a per-photon absorbed efficiency of 2.3%. Here, the results are notable in demonstrating that light-driven water oxidation can be carried out at a conductive electrode in a structure with the functional elements of Photosystem II including charge separation and water oxidation.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Alliance for Molecular PhotoElectrode Design for Solar Fuels (AMPED); University of North Carolina, Chapel Hill, NC (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001011
OSTI ID:
1566599
Journal Information:
Journal of the American Chemical Society, Vol. 141, Issue 19; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 34 works
Citation information provided by
Web of Science

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Cited By (1)

A stable dye-sensitized photoelectrosynthesis cell mediated by a NiO overlayer for water oxidation journal September 2019