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Title: Light-Driven Water Splitting Mediated by Photogenerated Bromine

Journal Article · · Angewandte Chemie (International Edition)

Abstract Light‐driven water splitting was achieved using a dye‐sensitized mesoporous oxide film and the oxidation of bromide (Br ) to bromine (Br 2 ) or tribromide (Br 3 ). The chemical oxidant (Br 2 or Br 3 ) is formed during illumination at the photoanode and used as a sacrificial oxidant to drive a water oxidation catalyst (WOC), here demonstrated using [Ru(bda)(pic) 2 ], ( 1 ; pic=picoline, bda=2,2′‐bipyridine‐6,6′‐dicarboxylate). The photochemical oxidation of bromide produces a chemical oxidant with a potential of 1.09 V vs. NHE for the Br 2 /Br couple or 1.05 V vs. NHE for the Br 3 /Br couple, which is sufficient to drive water oxidation at 1 (Ru V/IV ≈1.0 V vs. NHE at pH 5.6). At pH 5.6, using a 0.2  m acetate buffer containing 40 m m LiBr and the [Ru(4,4′‐PO 3 H 2 ‐bpy)(bpy) 2 ] 2+ ( RuP 2+ , bpy=2,2′‐bipyridine) chromophore dye on a SnO 2 /TiO 2 core–shell electrode resulted in a photocurrent density of around 1.2 mA cm −2 under approximately 1 Sun illumination and a Faradaic efficiency upon addition of 1 of 77 % for oxygen evolution.

Research Organization:
Univ. of North Carolina, Chapel Hill, NC (United States). Energy Frontier Research Center (EFRC) Center for Solar Fuels (UNC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001011
OSTI ID:
1470106
Alternate ID(s):
OSTI ID: 1423382
Journal Information:
Angewandte Chemie (International Edition), Vol. 57, Issue 13; Related Information: UNC partners with University of North Carolina (lead); Duke University; University of Florida; Georgia Institute of Technology; University; North Carolina Central University; Research Triangle Institute; ISSN 1433-7851
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 25 works
Citation information provided by
Web of Science

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Doping‐Induced Amorphization, Vacancy, and Gradient Energy Band in SnS 2 Nanosheet Arrays for Improved Photoelectrochemical Water Splitting journal May 2019
Robust, Scalable Synthesis of the Bulky Hagfeldt Donor for Dye‐Sensitized Solar Cells journal October 2019
A synergistic LUMO lowering strategy using Lewis acid catalysis in water to enable photoredox catalytic, functionalizing C–C cross-coupling of styrenes journal January 2018
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