dc.contributor.author
Drevon, Dorian
dc.contributor.author
Görlin, Mikaela
dc.contributor.author
Chernev, Petko
dc.contributor.author
Xi, Lifei
dc.contributor.author
Dau, Holger
dc.contributor.author
Lange, Kathrin M.
dc.date.accessioned
2019-06-11T10:22:29Z
dc.date.available
2019-06-11T10:22:29Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/24727
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-2487
dc.description.abstract
In-situ X-ray absorption spectroscopy (XAS) at the oxygen K-edge was used to investigate the role of oxygen during the oxygen evolution reaction (OER) in an electrodeposited Ni-Fe(OxHy) electrocatalyst in alkaline pH. We show the rise of a pre-peak feature at 529 eV in the O K-edge spectra, correlated to the appearance of a shoulder at the Ni L3-edge and formation of oxidized Ni3+/4+-O. Then, for the first time, we track the spectral changes in a dynamic fashion in both the soft and hard X-ray regimes during cyclic voltammetry (in situ CV-XAS) to obtain a fine-tuned resolution of the potential-related changes. The pre-peak feature at the O K-edge likely signifies formation of an electron deficient oxygen site. The electrophilic oxygen species appears and disappears reversibly in correlation with the Ni2+ ↔ Ni3+/4+ process, and persists during OER catalysis as long the metal is oxidized. Our study provides new insight into OER electrocatalysis: Before onset of the O-O bond formation step, the catalytic oxyhydroxide has accumulated electron deficiencies by both, oxidation of transition metal ions and formation of partially oxidized oxygen sites.
en
dc.rights.uri
https://creativecommons.org/licenses/by/4.0/
dc.subject
Oxygen Evolution Reaction
en
dc.subject.ddc
500 Naturwissenschaften und Mathematik::530 Physik::530 Physik
dc.title
Uncovering The Role of Oxygen in Ni-Fe(OxHy) Electrocatalysts using In situ Soft X-ray Absorption Spectroscopy during the Oxygen Evolution Reaction
dc.type
Wissenschaftlicher Artikel
dcterms.bibliographicCitation.articlenumber
1532
dcterms.bibliographicCitation.editor
10.1038/s41598-018-37307-x
dcterms.bibliographicCitation.journaltitle
Scientific Reports
dcterms.bibliographicCitation.volume
9
dcterms.bibliographicCitation.url
https://doi.org/10.1038/s41598-018-37307-x
refubium.affiliation
Physik
refubium.isSupplementedBy.url
https://www.nature.com/articles/s41598-018-37307-x
refubium.resourceType.isindependentpub
no
dcterms.accessRights.openaire
open access
dcterms.isPartOf.eissn
2045-2322