Ir-Ni Bimetallic OER Catalysts Prepared by Controlled Ni Electrodeposition on Irpoly and Ir(111)

dc.contributor.authorÖzer, Ebru
dc.contributor.authorSinev, Ilya
dc.contributor.authorMingers, Andrea
dc.contributor.authorAraujo, Jorge
dc.contributor.authorKropp, Thomas
dc.contributor.authorMavrikakis, Manos
dc.contributor.authorMayrhofer, Karl
dc.contributor.authorCuenya, Beatriz
dc.contributor.authorStrasser, Peter
dc.date.accessioned2022-09-12T08:58:56Z
dc.date.available2022-09-12T08:58:56Z
dc.date.issued2018-12-14
dc.date.updated2022-09-05T20:43:48Z
dc.description.abstractThe alteration of electrocatalytic surfaces with adatoms lead to structural and electronic modifications promoting adsorption, desorption, and reactive processes. This study explores the potentiostatic electrodeposition process of Ni onto polycrystalline Ir (Irpoly) and assesses the electrocatalytic properties of the resulting bimetallic surfaces. The electrodeposition resulted in bimetallic Ni overlayer (OL) structures and in combination with controlled thermal post-deposition annealing in bimetallic near-surface alloys (NSA). The catalytic oxygen evolution reaction (OER) activity of these two different Ni-modified catalysts is assessed and compared to a pristine, unmodified Irpoly. An overlayer of Ni on Irpoly showed superior performance in both acidic and alkaline milieu. The reductive annealing of the OL produced a NSA of Ni, which demonstrated enhanced stability in an acidic environment. The remarkable activity and stability improvement of Ir by Ni modification makes both systems efficient electrocatalysts for water oxidation. The roughness factor of Irpoly is also reported. With the amount of deposited Ni determined by inductively coupled plasma mass spectrometry (ICP-MS) and a degree of coverage (monolayer) in the dependence of deposition potential is established. The density functional theory (DFT) assisted evaluation of H adsorption on Irpoly enables determination of the preferred Ni deposition sites on the three low-index surfaces (111), (110), and (100).en
dc.description.sponsorshipDFG, 198634447, SPP 1613: Regenerativ erzeugte Brennstoffe durch lichtgetriebene Wasserspaltung: Aufklärung der Elementarprozesse und Umsetzungsperspektiven auf technologische Konzepteen
dc.identifier.eissn2571-9637
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/17414
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-16195
dc.language.isoenen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subject.ddc540 Chemie und zugeordnete Wissenschaftende
dc.subject.otheroxygen evolution reactionen
dc.subject.otheriridiumen
dc.subject.othernickelen
dc.subject.otherelectrodepositionen
dc.subject.othermodel catalysten
dc.subject.otherwater oxidationen
dc.subject.otherCO oxidationen
dc.subject.otherDFTen
dc.subject.otherhydrogen adsorptionen
dc.titleIr-Ni Bimetallic OER Catalysts Prepared by Controlled Ni Electrodeposition on Irpoly and Ir(111)en
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.doi10.3390/surfaces1010013en
dcterms.bibliographicCitation.issue1en
dcterms.bibliographicCitation.journaltitleSurfacesen
dcterms.bibliographicCitation.originalpublishernameMDPIen
dcterms.bibliographicCitation.originalpublisherplaceBaselen
dcterms.bibliographicCitation.pageend186en
dcterms.bibliographicCitation.pagestart165en
dcterms.bibliographicCitation.volume1en
tub.accessrights.dnbfreeen
tub.affiliationFak. 2 Mathematik und Naturwissenschaften>Inst. Chemie>FG Technische Chemie / Elektrokatalyse - Materialiende
tub.affiliation.facultyFak. 2 Mathematik und Naturwissenschaftende
tub.affiliation.groupFG Technische Chemie / Elektrokatalyse - Materialiende
tub.affiliation.instituteInst. Chemiede
tub.publisher.universityorinstitutionTechnische Universität Berlinen
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