Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 113, Issue 30, Pages 12958-12961Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp9060076
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Funding
- NSF
- Sony Corporation
- Pine Instruments
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0950320] Funding Source: National Science Foundation
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We describe the formation of stable, adherent, mesoporous films of 2 nm diameter (IrOx)-O-IV nanoparticles on glassy carbon electrodes, by a previously unreported method of controlled potential electro-flocculation from pH 13 nanoparticle solutions. These films initiate O-2 evolution from water oxidation and then achieve 100% current efficiency, at overpotentials only similar to 0.15 and similar to 0.25 V higher, respectively, than the reversible H2O/O-2 potential. The overpotentials, measured at similar to 0.5 mA/cm(2), are independent of pH and are the smallest yet reported for electrochemical water oxidation, a property important in possible uses in electrochemical solar cells. The films appear to be mesoporous and microscopically accessible, since O-2 evolution currents increase proportionately to multilayer nanoparticle film coverage but without a concurrent increase in overpotential.
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