The Importance of Surface IrOx in Stabilizing RuO2 for Oxygen Evolution

Maria Escudero Escribano, Anders Filsøe Pedersen, Elisa Antares Paoli, Rasmus Frydendal, Daniel Friebel, Paolo Malacrida, Jan Rossmeisl, Ifan E L Stephens, Ib Chorkendorff*

*Corresponding author for this work

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Abstract

The high precious metal loading and high overpotential of the oxygen evolution reaction (OER) prevents the widespread utilization of polymer electrolyte membrane (PEM) water electrolyzers. Herein we explore the OER activity and stability in acidic electrolyte of a combined IrOx/RuO2 system consisting of RuO2 thin films with sub-monolayer (1, 2 and 4 Å) amounts of IrOx deposited on top. Operando extended X-ray absorption fine structure (EXAFS) on the Ir L-3 edge revealed a rutile type IrO2 structure with some Ir sites occupied by Ru, IrOx being at the surface of the RuO2 thin film. We monitor corrosion on IrOx/RuO2 thin films by combining electrochemical quartz crystal microbalance (EQCM) with inductively coupled mass spectrometry (ICP-MS). We elucidate the importance of sub-monolayer surface IrOx in minimizing Ru dissolution. Our work shows that we can tune the surface properties of active OER catalysts such as RuO2, aiming to achieve higher electrocatalytic stability in PEM electrolyzers.
Original languageEnglish
JournalJournal of Physical Chemistry Part B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical
Volume122
Issue number2
Pages (from-to) 947–955
ISSN1520-6106
DOIs
Publication statusPublished - 2018

Cite this

Escribano, Maria Escudero ; Pedersen, Anders Filsøe ; Paoli, Elisa Antares ; Frydendal, Rasmus ; Friebel, Daniel ; Malacrida, Paolo ; Rossmeisl, Jan ; Stephens, Ifan E L ; Chorkendorff, Ib. / The Importance of Surface IrOx in Stabilizing RuO2 for Oxygen Evolution. In: Journal of Physical Chemistry Part B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical. 2018 ; Vol. 122, No. 2. pp. 947–955.
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title = "The Importance of Surface IrOx in Stabilizing RuO2 for Oxygen Evolution",
abstract = "The high precious metal loading and high overpotential of the oxygen evolution reaction (OER) prevents the widespread utilization of polymer electrolyte membrane (PEM) water electrolyzers. Herein we explore the OER activity and stability in acidic electrolyte of a combined IrOx/RuO2 system consisting of RuO2 thin films with sub-monolayer (1, 2 and 4 {\AA}) amounts of IrOx deposited on top. Operando extended X-ray absorption fine structure (EXAFS) on the Ir L-3 edge revealed a rutile type IrO2 structure with some Ir sites occupied by Ru, IrOx being at the surface of the RuO2 thin film. We monitor corrosion on IrOx/RuO2 thin films by combining electrochemical quartz crystal microbalance (EQCM) with inductively coupled mass spectrometry (ICP-MS). We elucidate the importance of sub-monolayer surface IrOx in minimizing Ru dissolution. Our work shows that we can tune the surface properties of active OER catalysts such as RuO2, aiming to achieve higher electrocatalytic stability in PEM electrolyzers.",
author = "Escribano, {Maria Escudero} and Pedersen, {Anders Fils{\o}e} and Paoli, {Elisa Antares} and Rasmus Frydendal and Daniel Friebel and Paolo Malacrida and Jan Rossmeisl and Stephens, {Ifan E L} and Ib Chorkendorff",
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doi = "10.1021/acs.jpcb.7b07047",
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journal = "Journal of Physical Chemistry Part B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical",
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The Importance of Surface IrOx in Stabilizing RuO2 for Oxygen Evolution. / Escribano, Maria Escudero; Pedersen, Anders Filsøe; Paoli, Elisa Antares; Frydendal, Rasmus; Friebel, Daniel; Malacrida, Paolo; Rossmeisl, Jan; Stephens, Ifan E L; Chorkendorff, Ib.

In: Journal of Physical Chemistry Part B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical, Vol. 122, No. 2, 2018, p. 947–955.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - The Importance of Surface IrOx in Stabilizing RuO2 for Oxygen Evolution

AU - Escribano, Maria Escudero

AU - Pedersen, Anders Filsøe

AU - Paoli, Elisa Antares

AU - Frydendal, Rasmus

AU - Friebel, Daniel

AU - Malacrida, Paolo

AU - Rossmeisl, Jan

AU - Stephens, Ifan E L

AU - Chorkendorff, Ib

PY - 2018

Y1 - 2018

N2 - The high precious metal loading and high overpotential of the oxygen evolution reaction (OER) prevents the widespread utilization of polymer electrolyte membrane (PEM) water electrolyzers. Herein we explore the OER activity and stability in acidic electrolyte of a combined IrOx/RuO2 system consisting of RuO2 thin films with sub-monolayer (1, 2 and 4 Å) amounts of IrOx deposited on top. Operando extended X-ray absorption fine structure (EXAFS) on the Ir L-3 edge revealed a rutile type IrO2 structure with some Ir sites occupied by Ru, IrOx being at the surface of the RuO2 thin film. We monitor corrosion on IrOx/RuO2 thin films by combining electrochemical quartz crystal microbalance (EQCM) with inductively coupled mass spectrometry (ICP-MS). We elucidate the importance of sub-monolayer surface IrOx in minimizing Ru dissolution. Our work shows that we can tune the surface properties of active OER catalysts such as RuO2, aiming to achieve higher electrocatalytic stability in PEM electrolyzers.

AB - The high precious metal loading and high overpotential of the oxygen evolution reaction (OER) prevents the widespread utilization of polymer electrolyte membrane (PEM) water electrolyzers. Herein we explore the OER activity and stability in acidic electrolyte of a combined IrOx/RuO2 system consisting of RuO2 thin films with sub-monolayer (1, 2 and 4 Å) amounts of IrOx deposited on top. Operando extended X-ray absorption fine structure (EXAFS) on the Ir L-3 edge revealed a rutile type IrO2 structure with some Ir sites occupied by Ru, IrOx being at the surface of the RuO2 thin film. We monitor corrosion on IrOx/RuO2 thin films by combining electrochemical quartz crystal microbalance (EQCM) with inductively coupled mass spectrometry (ICP-MS). We elucidate the importance of sub-monolayer surface IrOx in minimizing Ru dissolution. Our work shows that we can tune the surface properties of active OER catalysts such as RuO2, aiming to achieve higher electrocatalytic stability in PEM electrolyzers.

U2 - 10.1021/acs.jpcb.7b07047

DO - 10.1021/acs.jpcb.7b07047

M3 - Journal article

VL - 122

SP - 947

EP - 955

JO - Journal of Physical Chemistry Part B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical

JF - Journal of Physical Chemistry Part B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical

SN - 1520-6106

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