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Scalable production of foam-like nickel-molybdenum coatings via plasma spraying as bifunctional electrocatalysts for water splitting
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-3881-6764
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2023 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 25, no 31, p. 20794-20807Article in journal (Refereed) Published
Abstract [en]

Foam-like NiMo coatings were produced from an inexpensive mixture of Ni, Al, and Mo powders via atmospheric plasma spraying. The coatings were deposited onto stainless-steel meshes forming a highly porous network mainly composed of nanostructured Ni and highly active Ni4Mo. High material loading (200 mg cm−2) with large surface area (1769 cm2 per cm2) was achieved without compromising the foam-like characteristics. The coatings exhibited excellent activity towards both hydrogen evolution (HER) and oxygen evolution (OER) reactions in alkaline media. The HER active coating required an overpotential of 42 mV to reach a current density of −50 mA cm−2 with minimum degradation after a 24 h chronoamperometry test at −10 mA cm−2. Theoretical simulations showed that several crystal surfaces of Ni4Mo exhibit near optimum hydrogen adsorption energies and improved water dissociation that benefit the HER activity. The OER active coating also consisting of nanostructured Ni and Ni4Mo required only 310 mV to achieve a current density of 50 mA cm−2. The OER activity was maintained even after 48 h of continuous operation. We envisage that the development of scalable production techniques for Ni4Mo alloys will greatly benefit its usage in commercial alkaline water electrolysers.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2023. Vol. 25, no 31, p. 20794-20807
National Category
Other Chemical Engineering Physical Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-212732DOI: 10.1039/d3cp01444dISI: 001031244900001PubMedID: 37465860Scopus ID: 2-s2.0-85166241263OAI: oai:DiVA.org:umu-212732DiVA, id: diva2:1788411
Funder
Swedish Research Council, 2018-03937The Kempe Foundations, JCK-2132Carl Tryggers foundation , CTS 21-1581Swedish Research Council, 2022-06725Swedish Research Council, 2018-05973Available from: 2023-08-16 Created: 2023-08-16 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)
Opponent
Supervisors
Available from: 2024-03-06 Created: 2024-02-26 Last updated: 2024-03-06Bibliographically approved

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Wu, XiuyuPiñeiro-García, AlexisRafei, MounaBoulanger, NicolasGracia-Espino, Eduardo

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