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Oxygen Reduction Reactions on Single- or Few-Atom Discrete Active Sites for Heterogeneous Catalysis
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0001-9239-0541
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0003-0324-2788
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2019 (English)In: Advanced Energy Materials, ISSN 1614-6832, article id 1902084Article in journal (Refereed) Epub ahead of print
Abstract [en]

The oxygen reduction reaction (ORR) is of great importance in energy-converting processes such as fuel cells and in metal-air batteries and is vital to facilitate the transition toward a nonfossil dependent society. The ORR has been associated with expensive noble metal catalysts that facilitate the O-2 adsorption, dissociation, and subsequent electron transfer. Single- or few-atom motifs based on earth-abundant transition metals, such as Fe, Co, and Mo, combined with nonmetallic elements, such as P, S, and N, embedded in a carbon-based matrix represent one of the most promising alternatives. Often these are referred to as single atom catalysts; however, the coordination number of the metal atom as well as the type and nearest neighbor configuration has a strong influence on the function of the active sites, and a more adequate term to describe them is metal-coordinated motifs. Despite intense research, their function and catalytic mechanism still puzzle researchers. They are not molecular systems with discrete energy states; neither can they fully be described by theories that are adapted for heterogeneous bulk catalysts. Here, recent results on single- and few-atom electrocatalyst motifs are reviewed with an emphasis on reports discussing the function and the mechanism of the active sites.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2019. article id 1902084
Keywords [en]
active sites, catalyst motifs, electrocatalysis, oxygen reduction reaction, single active atom catalysts, transition metals, X-ray adsorption spectroscopy
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Identifiers
URN: urn:nbn:se:umu:diva-164137DOI: 10.1002/aenm.201902084ISI: 000486795700001OAI: oai:DiVA.org:umu-164137DiVA, id: diva2:1361903
Available from: 2019-10-17 Created: 2019-10-17 Last updated: 2019-10-17

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Sharifi, TivaGracia-Espino, EduardoHu, GuangzhiWågberg, Thomas

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