Journal Article

PUBDB-2017-09670

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Electrochemical Dissolution of Iridium and Iridium Oxide Par-ticles in Acidic Media: Transmission Electron Microscopy, Electrochemical Flow Cell Coupled to Inductively Coupled Plasma Mass Spectrometry and X-ray Absorption Spectros-copy Study

Jovanovič, P.Extern* ; Hodnik, N. ; Ruiz-Zepeda, F. ; Arcon, I.Extern* ; Jozinović, B. ; Zorko, M. ; Bele, M. ; Šala, M.Extern* ; Šelih, V. S. ; Hocevar, S. B. ; Gaberscek, M. (Corresponding author)

2017
American Chemical Society Washington, DC

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Please use a persistent id in citations: doi:10.1021/jacs.7b08071  doi:10.3204/PUBDB-2017-09670

Abstract: Iridium based particles as the most promising proton exchange membrane electrolyser electrocatalysts were investigatedby transmission electron microscopy (TEM), and by coupling of electrochemical flow cell (EFC) with online inductivelycoupled plasma mass spectrometer (ICP-MS). Additionally, a thin-film rotating disc electrode (RDE), an identical location transmissionand scanning electron microscopy (IL-TEM and IL-SEM) as well as an X-ray absorption spectroscopy (XAS) studies havebeen performed. Extremely sensitive online time-and potential-resolved electrochemical dissolution profiles revealed that iridiumparticles dissolved already well below oxygen evolution reaction (OER) potentials, presumably induced by iridium surface oxidationand 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 alteredcorrosion 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 temperatureelectrochemical hydrogen production device, namely a proton exchange membrane electrolyser.

Note: © American Chemical Society

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Contributing Institute(s):

1. DOOR-User (DOOR)

Research Program(s):

1. 6G3 - PETRA III (POF3-622) (POF3-622)
2. FS-Proposal: I-20160764 EC (I-20160764-EC) (I-20160764-EC)
3. CALIPSOplus - Convenient Access to Light Sources Open to Innovation, Science and to the World (730872) (730872)

Experiment(s):

1. PETRA Beamline P64 (PETRA III)

Appears in the scientific report 2017

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Database coverage:
; ; BIOSIS Previews ; Current Contents - Life Sciences ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF >= 10 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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