Journal
ANALYTICAL CHEMISTRY
Volume 81, Issue 19, Pages 8094-8100Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac901291v
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Funding
- The National Science Foundation [CHE-0451494, CHE-0808927]
- Robert A. Welch Foundation [F-0021]
- Center for Electrochemistry
- Ministerio Espanol de Educacion y Ciencia
- Fundacion Espanola para la Ciencia y la Tecnologia
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0808927] Funding Source: National Science Foundation
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We present data for H2O2 production at eight different materials tested as electrocatalysts for the oxygen reduction reaction (ORR) in 0.5 M H2SO4 (Hg, Au, Ag, Cu, Pt, Pd, Pd80Co20, and Au60Cu40) using scanning electrochemical microscopy (SECM) as an alternative to the widely used rotating ring-disk electrode (RRDE) method. The amount of H2O2 is related to the total number of electrons, n, found in the O-2 reduction reaction, with n = 2 showing only H2O2 production and n = 4 showing no H2O2 formation. From the SECM study Hg shows n close to 2, whereas Pt and Pd80Co20 show n-values near 4. The other materials show intermediate n-values as a function of potential.
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