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Potential-Induced Pitting Corrosion of an IrO2(110)-RuO2(110)/Ru(0001) Model Electrode under Oxygen Evolution Reaction Conditions

Weber, Tim ; Pfrommer, Johannes ; Abb, Marcel J.S. ; Herd, Benjamin ; Khalid, Omeir ; Rohnke, Marcus ; Lakner, Pirmin H. ; Evertsson, Jonas LU ; Volkov, Sergey and Bertram, Florian LU , et al. (2019) In ACS Catalysis 9(7). p.6530-6539
Abstract

Sophisticated IrO2(110)-based model electrodes are prepared by deposition of a 10 nm thick single-crystalline IrO2(110) layer supported on a structure-directing RuO2(110)/Ru(0001) template, exposing a regular array of mesoscopic rooflike structures. With this model electrode together with the dedicated in situ synchrotron based techniques (SXRD, XRR) and ex situ characterization techniques (SEM, ToF-SIMS, XPS), the corrosion process of IrO2(110) in an acidic environment (pH 0.4) is studied on different length scales. Potential-induced pitting corrosion starts at 1.48 V vs SHE and is initiated at so-called surface grain boundaries, where three rotational domains of IrO2(110) meet.... (More)

Sophisticated IrO2(110)-based model electrodes are prepared by deposition of a 10 nm thick single-crystalline IrO2(110) layer supported on a structure-directing RuO2(110)/Ru(0001) template, exposing a regular array of mesoscopic rooflike structures. With this model electrode together with the dedicated in situ synchrotron based techniques (SXRD, XRR) and ex situ characterization techniques (SEM, ToF-SIMS, XPS), the corrosion process of IrO2(110) in an acidic environment (pH 0.4) is studied on different length scales. Potential-induced pitting corrosion starts at 1.48 V vs SHE and is initiated at so-called surface grain boundaries, where three rotational domains of IrO2(110) meet. The most surprising result is, however, that even when the electrode potential is increased to 1.94 V vs SHE 60-70% of the IrO2 film still stays intact down to the mesoscale and atomic scale and no uniform thinning of the IrO2(110) layer is encountered. Neither flat IrO2(110) terraces nor single steps are attacked. Ultrathin single-crystalline IrO2(110) layers seem to be much more stable to anodic corrosion than hitherto expected.

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publishing date
type
Contribution to journal
publication status
published
subject
keywords
anodic corrosion, catalytic stability, electrocatalysis, in situ studies, oxygen evolution reaction (OER), single-crystalline IrO(110) model electrodes, SXRD, XRR
in
ACS Catalysis
volume
9
issue
7
pages
10 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85068445620
ISSN
2155-5435
DOI
10.1021/acscatal.9b01402
language
English
LU publication?
yes
id
bbdc90fa-d626-4d24-97ff-4a2be4cd29d9
date added to LUP
2019-07-19 11:45:15
date last changed
2023-12-03 21:13:35
@article{bbdc90fa-d626-4d24-97ff-4a2be4cd29d9,
  abstract     = {{<p>Sophisticated IrO<sub>2</sub>(110)-based model electrodes are prepared by deposition of a 10 nm thick single-crystalline IrO<sub>2</sub>(110) layer supported on a structure-directing RuO<sub>2</sub>(110)/Ru(0001) template, exposing a regular array of mesoscopic rooflike structures. With this model electrode together with the dedicated in situ synchrotron based techniques (SXRD, XRR) and ex situ characterization techniques (SEM, ToF-SIMS, XPS), the corrosion process of IrO<sub>2</sub>(110) in an acidic environment (pH 0.4) is studied on different length scales. Potential-induced pitting corrosion starts at 1.48 V vs SHE and is initiated at so-called surface grain boundaries, where three rotational domains of IrO<sub>2</sub>(110) meet. The most surprising result is, however, that even when the electrode potential is increased to 1.94 V vs SHE 60-70% of the IrO<sub>2</sub> film still stays intact down to the mesoscale and atomic scale and no uniform thinning of the IrO<sub>2</sub>(110) layer is encountered. Neither flat IrO<sub>2</sub>(110) terraces nor single steps are attacked. Ultrathin single-crystalline IrO<sub>2</sub>(110) layers seem to be much more stable to anodic corrosion than hitherto expected.</p>}},
  author       = {{Weber, Tim and Pfrommer, Johannes and Abb, Marcel J.S. and Herd, Benjamin and Khalid, Omeir and Rohnke, Marcus and Lakner, Pirmin H. and Evertsson, Jonas and Volkov, Sergey and Bertram, Florian and Znaiguia, Raja and Carla, Francesco and Vonk, Vedran and Lundgren, Edvin and Stierle, Andreas and Over, Herbert}},
  issn         = {{2155-5435}},
  keywords     = {{anodic corrosion; catalytic stability; electrocatalysis; in situ studies; oxygen evolution reaction (OER); single-crystalline IrO(110) model electrodes; SXRD; XRR}},
  language     = {{eng}},
  month        = {{06}},
  number       = {{7}},
  pages        = {{6530--6539}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{ACS Catalysis}},
  title        = {{Potential-Induced Pitting Corrosion of an IrO<sub>2</sub>(110)-RuO<sub>2</sub>(110)/Ru(0001) Model Electrode under Oxygen Evolution Reaction Conditions}},
  url          = {{http://dx.doi.org/10.1021/acscatal.9b01402}},
  doi          = {{10.1021/acscatal.9b01402}},
  volume       = {{9}},
  year         = {{2019}},
}