TY  - JOUR
AU  - Jovanovič, Primož
AU  - Hodnik, Nejc
AU  - Ruiz-Zepeda, Francisco
AU  - Arcon, Iztok
AU  - Jozinović, Barbara
AU  - Zorko, Milena
AU  - Bele, Marjan
AU  - Šala, Martin
AU  - Šelih, Vid Simon
AU  - Hocevar, Samo B.
AU  - Gaberscek, Miran
TI  - 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
JO  - Journal of the American Chemical Society
VL  - 139
IS  - 36
SN  - 1520-5126
CY  - Washington, DC
PB  - American Chemical Society
M1  - PUBDB-2017-09670
SP  - 12837 – 12846
PY  - 2017
N1  - © American Chemical Society
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - pmid:28810123
UR  - <Go to ISI:>//WOS:000411043900073
DO  - DOI:10.1021/jacs.7b08071
UR  - https://bib-pubdb1.desy.de/record/390613
ER  -