Journal
SCIENCE
Volume 336, Issue 6086, Pages 1298-1301Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1220234
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Funding
- University of Washington
- American Chemical Society [51178-ND3]
- U.S. NSF [CHE-1151726]
- Department of Energy Office of Science [DE-AC05-06OR23100]
- NSF Center for Enabling New Technologies through Catalysis
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1151726] Funding Source: National Science Foundation
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Oxidation/reduction reactions at metal oxide surfaces are important to emerging solar energy conversion processes, photocatalysis, and geochemical transformations. Here we show that the usual description of these reactions as electron transfers is incomplete. Reduced TiO2 and ZnO nanoparticles in solution can transfer an electron and a proton to phenoxyl and nitroxyl radicals, indicating that e(-) and H+ are coupled in this interfacial reaction. These proton-coupled electron transfer (PCET) reactions are rapid and quantitative. The identification of metal oxide surfaces as PCET reagents has implications for the understanding and development of chemical energy technologies, which will rely on e(-)/H+ coupling.
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