Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 138, Issue 8, Pages 2516-2519Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.5b13376
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Funding
- National Science Foundation [CHE-1151264]
- National Institutes of Health [RR023614]
- NSF [CHE-0840501]
- NCBC [2009-IDG-1015]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1151264] Funding Source: National Science Foundation
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Cyclic voltammetry is a widely used and powerful tool for sensitively and selectively measuring hydrogen peroxide (H2O2). Herein, voltammetry was combined with electron paramagnetic resonance spectroscopy to identify and define the role of an oxygen-centered radical liberated during the oxidation of H2O2. The spin-trap reagents, 5,5-dimethyl-1-pyrroline N-oxide (DMPO) and 2-ethoxycarbonyl-2-methyl-3,4-dihydro-2H-pyrrole-1-oxide (EMPO), were employed. Spectra exhibit distinct hyperfine patterns that clearly identify the (DMPOOH)-O-center dot and (EMPOOH)-O-center dot adducts. Multiple linear regression analysis of voltammograms demonstrated that the hydroxyl radical is a principal contributor to the voltammetry of H2O2, as signal is attenuated when this species is trapped. These data incorporate a missing, fundamental element to our knowledge of the mechanisms that underlie H2O2 electrochemistry.
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