Electrocatalytic Trends on IB Group Metals: The Oxygen Reduction Reaction

B. B. Blizanac, V. Stamenkovic and N. M. Markovic

The rotating ring disk method (RRDE) is applied to investigate the oxygen reduction reaction (ORR) on Cu(111), Ag(111) and Au(111) single crystal surfaces in alkaline and acidic media. Independently of the pH of solution, we found that at low overpotentials the order of activity increases from Cu(111) to Ag(111) to Au(111). At high overpotentials, however, Cu(111) and Ag(111) are much more active than Au(111). An interpretation of the variation in activity is presented based on the premise that the rate of the ORR is controlled by two factors: a chemical-dependent part, Δ Gθ* = Δ G0* + γ Δ GΘ0Θad, and the pre-exponential part which is determined by the adsorption of spectator species (Θad) and the availablitiy of bare metal sites, i.e., the (1-Θad) term.

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Founded in 1887, the Zeitschrift für Physikalische Chemie covers the main developments in physical chemistry, placing with an emphasis on experimental research. It represents a combination ofdiscusses reaction kinetics and spectroscopy, surface research and electrochemistry, thermodynamics and the structure analysis of matter in its various conditions, among other topics.