The Bifurcation Point of the Oxygen Reduction Reaction on Au-Pd Nanoalloys
Artikel i vetenskaplig tidskrift, 2016

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 principle 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 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.

Au-Pd catalysts

electrocatalysis

Hydrogen peroxide synthesis

oxygen reduction

nanoalloys

Författare

Jakub Staszak-Jirkovský

Göteborgs universitet

Elisabet Ahlberg

Göteborgs universitet

Itai Panas

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

David Schiffrin

University of Liverpool

Faraday Discussions

1359-6640 (ISSN) 1364-5498 (eISSN)

Vol. 188 257-278

Ämneskategorier

Oorganisk kemi

Fysikalisk kemi

Teoretisk kemi

Drivkrafter

Hållbar utveckling

Styrkeområden

Nanovetenskap och nanoteknik

Materialvetenskap

DOI

10.1039/c5fd00233h

PubMed

27089504

Mer information

Senast uppdaterat

2018-02-28