Electrocatalysis of Water Oxidation by H2O‐Capped Iridium‐Oxide Nanoparticles Electrodeposited on Spectroscopic Graphite. Issue 13 (8th July 2014)

• Record Type: Journal Article
• Authors: Mirbagheri, Naghmehalsadat; Chevallier, Jacques; Kibsgaard, Jakob; Besenbacher, Flemming; Ferapontova, Elena E.
• Is Part Of: Chemphyschem. Volume 15:Issue 13(2014)
• Page Start: 2844
• Page End: 2850
• Publication Date: 2014-07-08
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.05
• DOI: 10.1002/cphc.201402079
• Languages: English
• ISSNs: 1439-4235

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Electrocatalysis of water oxidation by 1.54 nm IrO_{<italic>x</italic>} nanoparticles (NPs) immobilized on spectroscopic graphite electrodes was demonstrated to proceed with a higher efficiency than on all other, hitherto reported, electrode supports. IrO_{<italic>x</italic>} NPs were electrodeposited on the graphite surface, and their electrocatalytic activity for water oxidation was correlated with the surface concentrations of different redox states of IrO_{<italic>x</italic>} as a function of the deposition time and potential. Under optimal conditions, the overpotential of the reaction was reduced to 0.21 V and the electrocatalytic current density was 43 mA cm⁻² at 1 V versus Ag/AgCl (3 <sc>M</sc> KCl) and pH 7. These results beneficially compete with previously reported electrocatalytic oxidations of water by IrO_{<italic>x</italic>} NPs electrodeposited onto glassy carbon and indium tin oxide electrodes and provide the basis for the further development of efficient IrO_{<italic>x</italic>} NP‐based electrocatalysts immobilized on high‐surface‐area carbon electrode materials.</p> </abstract>