期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 5, 期 2, 页码 5694-5700出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ee02929d
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资金
- National Science Foundation (NSF) Powering the Planet Center for Chemical Innovation (CCI-Solar) [CHE-0802907, CHE-0947829]
- Molecular Materials Research Center of the Beckman Institute at the California Institute of Technology
- NSF
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0802907] Funding Source: National Science Foundation
The faradaic efficiency for O-2(g) evolution at thin-film WO3 photoanodes has been evaluated in a series of acidic aqueous electrolytes. In 1.0 M H2SO4, persulfate was the predominant photoelectrochemical oxidation product, and no O-2 was detected unless catalytic quantities of Ag+(aq) were added to the electrolyte. In contact with 1.0 M HClO4, dissolved O-2 was observed with nearly unity faradaic efficiency, but addition of a hole scavenger, 4-cyanopyridine N-oxide, completely suppressed O-2 formation. In 1.0MHCl, Cl-2(g) was the primary oxidation product. These results indicate that at WO3 photoanodes, water oxidation is dominated by oxidation of the acid anions in 1.0 M HCl, H2SO4, and HClO4, respectively.
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