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Title:Electrochemical dissolution of iridium and iridium oxide particles in acidic media : transmission electron microscopy, electrochemical flow cell coupled to inductively coupled plasma mass spectrometry and X-ray absorption spectroscopy study
Authors:Jovanovič, Primož (Author)
Hodnik, Nejc (Author)
Ruiz-Zepeda, Francisco (Author)
Arčon, Iztok (Author)
Jozinović, Barbara (Author)
Zorko, Milena (Author)
Bele, Marjan (Author)
Šala, Martin (Author)
Šelih, Vid Simon (Author)
Hočevar, Samo B. (Author)
Gaberšček, Miran (Author)
Files:This document has no files. This document may have a phisical copy in the library of the organization, check the status via COBISS. Link is opened in a new window
Language:English
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Iridium based particles as the most promising proton exchange membrane electrolyser electrocatalysts were investigated by transmission electron microscopy (TEM), and by coupling of electrochemical flow cell (EFC) with online inductively coupled plasma mass spectrometer (ICP-MS). Additionally, a thin-film rotating disc electrode (RDE), an identical location transmission and scanning electron microscopy (IL-TEM and IL-SEM) as well as an X-ray absorption spectroscopy (XAS) studies have been performed. Extremely sensitive online time-and potential-resolved electrochemical dissolution profiles revealed that iridium particles dissolved already well below oxygen evolution reaction (OER) potentials, presumably induced by iridium surface oxidation and reduction processes, also referred to as transient dissolution. Overall, thermally prepared rutile type IrO2 particles (T-IrO2) are substantially more stable and less active in comparison to as prepared metallic (A-Ir) and electrochemically pretreated (E-Ir) analogues. Interestingly, under OER relevant conditions E-Ir particles exhibit superior stability and activity owing to the altered corrosion mechanism where the formation of unstable Ir(>IV) species is hindered. Due to the enhanced and lasting OER performance, electrochemically pre-oxidized E-Ir particles may be considered as the electrocatalyst of choice for an improved low temperature electrochemical hydrogen production device, namely a proton exchange membrane electrolyser.
Keywords:Iridium Oxide Par-ticles, Electrochemical Dissolution of Iridium, Ir L3-edge XANES
Year of publishing:2017
Number of pages:Str. 1-12
Numbering:1
COBISS_ID:6203674 Link is opened in a new window
ISSN on article:0002-7863
URN:URN:SI:UNG:REP:MF97OCXH
DOI:10.1021/jacs.7b08071 Link is opened in a new window
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Downloads:0
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Record is a part of a journal

Title:Journal of the American Chemical Society
Shortened title:J. Am. Chem. Soc.
Publisher:American Chemical Society
ISSN:0002-7863
COBISS.SI-ID:5281029 New window
Year of publishing:2017

Secondary language

Language:Undetermined
Keywords:elektrokataliza, elektrolizer, iridij, evolucija kisika, transmisijska elektronska mikroskopija, ICP-MS, XAS, EXAFS


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