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A Quaternary mixed oxide protective scaffold for ruthenium during oxygen evolution reaction in acidic media
Umeå University, Faculty of Science and Technology, Department of Physics. (Eduardo Gracia Lab)ORCID iD: 0000-0002-0601-3676
Umeå University, Faculty of Science and Technology, Department of Physics. (Eduardo Gracia Lab)
Umeå University, Faculty of Science and Technology, Department of Physics. (Eduardo Gracia Lab)
Umeå University, Faculty of Science and Technology, Department of Physics. Faculty of physics and astronomy, Julius-Maximilians-Universität Würzburg, Würzburg, Germany. (Eduardo Gracia Lab)
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2023 (English)In: Communications Engineering, E-ISSN 2731-3395, Vol. 2, no 1, article id 28Article in journal, Editorial material (Refereed) Published
Abstract [en]

Proton exchange membrane water electrolysis is widely used in hydrogen production, but its application is limited by significant electrocatalyst dissolution at the anode during the oxygen evolution reaction (OER). The best performing electrocatalysts to date are based on ruthenium and iridium oxides, but these experience degradation even at moderate cell potentials. Here we investigate a quaternary Sn-Sb-Mo-W mixed oxide as a protective scaffold for ruthenium oxide. The acid-stable mixed oxide consists of an interconnected network of nanostructured oxides capable of stabilizing ruthenium into the matrix (Ru-MO). In combination with titanium fibre felt, we observed a lower degradation in the oxygen evolution reaction activity compared to unprotected ruthenium oxide after the electrochemical stress test. The superior stability of Ru-MO@Ti is attributed to the presence of MO which hinders the formation of reactive higher valence ruthenium (Ru+8). Our work demonstrates the potential of multi-metal oxides to extend the lifetime of the OER active metal and the titanium support.

Place, publisher, year, edition, pages
Springer Nature, 2023. Vol. 2, no 1, article id 28
National Category
Materials Chemistry
Research subject
Materials Science
Identifiers
URN: urn:nbn:se:umu:diva-215473DOI: 10.1038/s44172-023-00080-5OAI: oai:DiVA.org:umu-215473DiVA, id: diva2:1806031
Funder
Swedish Research Council, 2018-03937The Kempe Foundations, JCK-2132Carl Tryggers foundation , CTS 21-1581Swedish Research Council, 2018-03937The Kempe Foundations, JCK-2132Carl Tryggers foundation , CTS 21-1581Swedish Research Council, 2018-03937The Kempe Foundations, JCK-2132Carl Tryggers foundation , CTS 21-1581Available from: 2023-10-19 Created: 2023-10-19 Last updated: 2024-02-26Bibliographically approved
In thesis
1. Plasma spray coatings as catalysts for water splitting: exploring novel materials and strategies
Open this publication in new window or tab >>Plasma spray coatings as catalysts for water splitting: exploring novel materials and strategies
2024 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Plasmagenererade katalysbeläggningar för vattenelektrolys : nya material och strategier
Abstract [en]

Today, fossil fuels still play a dominant role in the global energy systems. However, they are depleting quickly and the combustion of them causes many environmental concerns, including global warming, air pollution, ozone layer depletion, and acid rain. In response to these environmental challenges, a transition from fossil fuel energy sources towards sustainable alternatives is urgent and necessary. Unlike traditional fossil fuels, hydrogen serves as an environmentally friendly fuel with exceptional energy density, and its combustion generates no greenhouse gases. Moreover, hydrogen holds the versatility to be produced, stored, and utilized by various sectors, including transportation, industry, and electricity generation. Electrolyzer technology offers a sustainable pathway for clean hydrogen production when using electricity generated from renewable sources such as solar and wind power. The integration of hydrogen into energy systems holds significant potential for a decarbonized and sustainable future.

In this thesis, we focused on creating affordable coatings using earth-abundant transition metals and explored their application as electrocatalysts for hydrogen and oxygen production in alkaline and acidic environments. We developed novel synthetic routes and new materials, we studied their intricate structure and composition, and we were able to fine-tune their catalytic activity and durability. Our findings demonstrated that plasma spray technology offers a scalable approach for producing highly active catalysts, while also developing coatings that can tolerate acidic environments and extend the lifetime of the state-of-the-art oxygen evolution catalysts. Furthermore, we tested and discussed alternative materials aiming to offer cost-effective substitutes for expensive Pt-based electrocatalysts for hydrogen production.

Place, publisher, year, edition, pages
Umeå: Umeå University, 2024. p. 66
Keywords
Plasma spray, water splitting, coatings, electrocatalyst, hydrogen evolution reaction, oxygen evolution reaction
National Category
Physical Chemistry Energy Systems
Research subject
Physical Chemistry
Identifiers
urn:nbn:se:umu:diva-221502 (URN)9789180703086 (ISBN)9789180703093 (ISBN)
Public defence
2024-03-27, NAT.D.440, Naturvetarhuset, 13:00 (English)
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Supervisors
Available from: 2024-03-06 Created: 2024-02-26 Last updated: 2024-03-06Bibliographically approved

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fulltext(3215 kB)51 downloads
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Piñeiro-García, AlexisWu, XiuyuRafei, MounaGracia-Espino, Eduardo

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