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
transmisijska elektronska mikroskopija
info:eu-repo/classification/ddc/540
XAS
Ir L3-edge XANES
02 engineering and technology
540
7. Clean energy
01 natural sciences
0104 chemical sciences
EXAFS
evolucija kisika
13. Climate action
Iridium Oxide Par-ticles
iridij
Electrochemical Dissolution of Iridium
ICP-MS
elektrokataliza
elektrolizer
0210 nano-technology
DOI:
10.1021/jacs.7b08071
Publication Date:
2017-08-15T22:09:05Z
AUTHORS (11)
ABSTRACT
Journal of the American Chemical Society 139(36), 12837 – 12846 (2017). doi:10.1021/jacs.7b08071<br/>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.<br/>Published by American Chemical Society, Washington, DC<br/>
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