1.
Angew Chem Int Ed Engl
; 53(28): 7169-72, 2014 Jul 07.
Artigo
em Inglês
| MEDLINE
| ID: mdl-24889896
RESUMO
An iridium oxide nanoparticle electrocatalyst under oxygen evolution reaction conditions was probed inâ situ by ambient-pressure X-ray photoelectron spectroscopy. Under OER conditions, iridium undergoes a change in oxidation state from Ir(IV) to Ir(V) that takes place predominantly at the surface of the catalyst. The chemical change in iridium is coupled to a decrease in surface hydroxide, providing experimental evidence which strongly suggests that the oxygen evolution reaction on iridium oxide occurs through an OOH-mediated deprotonation mechanism.