Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 27th March 2019 from 11:00 AM to 1:00 PM (GMT).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.


Volume 188, 2016
Previous Article Next Article

The bifurcation point of the oxygen reduction reaction on Au–Pd nanoalloys

Author affiliations

Abstract

The oxygen reduction reaction is of major importance in energy conversion and storage. Controlling electrocatalytic activity and its selectivity remains a challenge of modern electrochemistry. Here, first principles calculations and analysis of experimental data unravel the mechanism of this reaction on Au–Pd nanoalloys in acid media. A mechanistic model is proposed from comparison of the electrocatalysis of oxygen and hydrogen peroxide reduction on different Au–Pd ensembles. A H2O production channel on contiguous Pd sites proceeding through intermediates different from H2O2 and OOHσ adsorbate is identified as the bifurcation point for the two reaction pathway alternatives to yield either H2O or H2O2. H2O2 is a leaving group, albeit reduction of H2O2 to H2O can occur by electrocatalytic HO–OH dissociation that is affected by the presence of adsorbed OOHσ. Similarities and differences between electrochemical and direct synthesis from H2 + O2 reaction on Au–Pd nanoalloys are discussed.

Back to tab navigation

Supplementary files

Publication details

The article was received on 21 Dec 2015, accepted on 07 Jan 2016 and first published on 07 Jan 2016


Article type: Paper
DOI: 10.1039/C5FD00233H
Citation: Faraday Discuss., 2016,188, 257-278

  •   Request permissions

    The bifurcation point of the oxygen reduction reaction on Au–Pd nanoalloys

    J. Staszak-Jirkovský, E. Ahlberg, I. Panas and D. J. Schiffrin, Faraday Discuss., 2016, 188, 257
    DOI: 10.1039/C5FD00233H

Search articles by author

Spotlight

Advertisements