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The Bifurcation Point of the Oxygen Reduction Reaction on Au-Pd Nanoalloys

Jakub Staszak-Jirkovský ; Elisabet Ahlberg ; Itai Panas (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; David J Schiffrin
Faraday discussions (1364-5498). Vol. 188 (2016), p. 257-278.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Hydrogen peroxide synthesis, oxygen reduction, nanoalloys, Au-Pd catalysts, electrocatalysis



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Denna post skapades 2016-01-09. Senast ändrad 2016-08-26.
CPL Pubid: 230288

 

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Institutioner (Chalmers)

Institutionen för kemi och molekylärbiologi (GU)
Institutionen för kemi och kemiteknik, Oorganisk miljökemi

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Materialvetenskap
Nanovetenskap och nanoteknik
Hållbar utveckling
Elektrokemi
Kinetik
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