Highly Active and Stable Iridium Pyrochlores for Oxygen Evolution Reaction
Open accessAbstract
Proton exchange membrane water electrolysis (PEMWE) is a promising technology for electricity-to-fuel conversion which allows for direct production of hydrogen from water. One of the key problems limiting widespread implementation of PEMWE into energy systems is the sluggish kinetics of the anodic process: the oxygen evolution reaction (OER). Additionally, state-of-the-art OER materials contain large amounts of low abundant noble metals (Ru, Ir), and therefore, development of low-cost, highly active and stable OER catalysts remains an important challenge. We developed a synthetic approach to the iridium pyrochlores–complex oxides of iridium with reduced content of the noble metal as compared to IrO 2 . The materials were synthesized from molten sodium nitrate (Adams fusion method) at moderate temperatures (500–575 °C) and consist of highly crystalline iridium pyrochlore nanoparticles with surface areas of up to 40 m 2 g –1, which is a significant improvement compared to the traditional high temperature solid-state synthesis. Electrochemical measurements in acidic media showed that yttrium and bismuth pyrochlore catalysts possess high OER activity approaching the activity of state-of-the-art IrO 2 nanoparticles. High intrinsic activities and stability behavior of yttrium iridium catalysts were correlated with the formation of the highly active IrO x surface layer due to leaching of the Y 3+ cations into the electrolyte solution, revealed both experimentally and computationally using density functional theory calculations.
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Choosing a high-symmetry path for band structure comparison could result in an unsatisfactory arbitrary choice, as different standardization recipes exist and interesting features may occur far from high-symmetry lines.
“Choosing a high-symmetry path could result in an unsatisfactory arbitrary choice, as different recipes for the standardization of paths have been introduced in the recent literature [37, 38] and interesting features of the band structure may occur far from the high-symmetry lines (such as Weyl points) [39, 40].”
From Precision and efficiency in solid-state pseudopotential calculations (2018) · cites this paper as [39]
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Precision and efficiency in solid-state pseudopotential calculations
Prandini, G., Marrazzo, A., Castelli, I. E., Mounet, N., & Marzari, N. (2018) · npj Computational Materials · doi:10.1038/s41524-018-0127-2 · Cited by 917 · see citing works
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- Authors
- Lebedev, D., Povia, M., Waltar, K., Abdala, P. M., Castelli, I. E., Fabbri, E., Blanco, M. V., Fedorov, A., Copéret, C., Marzari, N., & Schmidt, T. J.
- Affiliations
- ETH Zurich (CH)
- Paul Scherrer Institute (CH)
- École Polytechnique Fédérale de Lausanne (CH)
- European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex, France
- Corresponding author
- Copéret, Christophe
- Marzari, Nicola
- Schmidt, Thomas J.
- ORCID
- Venue
- Chemistry of Materials
- Publisher
- American Chemical Society (ACS)
- Published
- 2017-06-09
- Volume
- 29
- Issue
- 12
- Pages
- 5182-5191
- ISSN
- 0897-4756 (ISSN-L)
- 1520-5002
- OpenAlex
- W2618874164
- Cited by
- 228
- References
- 57
- Citations by year
- 2026: 10 · 2025: 29 · 2024: 29 · 2023: 21 · 2022: 25 · 2021: 27 · 2020: 29 · 2019: 33 · 2018: 21 · 2017: 4
- FWCI
- 6.38
- Type
- journal article
- Language
- en
- Open access
- green
- infoscience.epfl.ch
- Locations
- Chemistry of Materials (publishedVersion)
- DORA PSI (Paul Scherrer Institute) (submittedVersion)
- Infoscience (Ecole Polytechnique Fédérale de Lausanne) (submittedVersion)
- Infoscience (Ecole Polytechnique Fédérale de Lausanne) (submittedVersion, cc-by-nc-nd)
- Funders
- Bundesamt f?r Energie
- Kompetenzzentrum f?r Energie und Mobilit?t
- Kommission f?r Technologie und Innovation
- Schweizer Kompetenzzentrum f?r Energieforschung ? Strombereitstellung
- Swiss Electric Research
- Topics
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Electrocatalysts for Energy Conversion
- Physical Sciences › Materials Science › Materials Chemistry › Catalytic Processes in Materials Science
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Fuel Cells and Related Materials
- Keywords
- oxygen evolution reaction, proton exchange membrane water electrolysis, noble-metal-free electrocatalysts, catalyst stability, hydrogen production
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