J
Juan J. Velasco Vélez
Researcher at Max Planck Society
Publications - 9
Citations - 680
Juan J. Velasco Vélez is an academic researcher from Max Planck Society. The author has contributed to research in topics: Oxygen evolution & Catalysis. The author has an hindex of 5, co-authored 7 publications receiving 466 citations. Previous affiliations of Juan J. Velasco Vélez include Fritz Haber Institute of the Max Planck Society.
Papers
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Journal ArticleDOI
The electronic structure of iridium and its oxides
Verena Pfeifer,Verena Pfeifer,Travis E. Jones,Juan J. Velasco Vélez,Juan J. Velasco Vélez,Cyriac Massué,Cyriac Massué,Rosa Arrigo,Detre Teschner,Frank Girgsdies,Michael Scherzer,Michael Scherzer,Mark T. Greiner,Jasmin Allan,Maike Hashagen,Gisela Weinberg,Simone Piccinin,Michael Hävecker,Michael Hävecker,Axel Knop-Gericke,Robert Schlögl,Robert Schlögl +21 more
TL;DR: In this paper, the electronic structure of iridium oxide was investigated using synchrotron-based X-ray photoemission and absorption spectroscopies with theoretical calculations.
Journal ArticleDOI
In situ observation of reactive oxygen species forming on oxygen-evolving iridium surfaces
Verena Pfeifer,Verena Pfeifer,Travis E. Jones,Juan J. Velasco Vélez,Juan J. Velasco Vélez,Rosa Arrigo,Simone Piccinin,Michael Hävecker,Michael Hävecker,Axel Knop-Gericke,Robert Schlögl,Robert Schlögl +11 more
TL;DR: In situ XAS measurements reveal that electron-deficient oxygen species form during OER on IrOx and correlate with catalytic activity.
Journal ArticleDOI
Reactive oxygen species in iridium-based OER catalysts
Verena Pfeifer,Verena Pfeifer,Travis Jones,Sabine Wrabetz,Cyriac Massué,Juan J. Velasco Vélez,Rosa Arrigo,Michael Scherzer,Simone Piccinin,Michael Hävecker,Axel Knop-Gericke,Robert Schlögl +11 more
TL;DR: Exceptional reactivity of electrophilic oxygen species in highly OER-active IrIII/IV oxyhydroxides is evidenced by room temperature CO oxidation.
Journal ArticleDOI
In Situ Electrochemical Cells to Study the Oxygen Evolution Reaction by Near Ambient Pressure X-ray Photoelectron Spectroscopy
Verena Streibel,Michael Hävecker,Michael Hävecker,Youngmi Yi,Youngmi Yi,Juan J. Velasco Vélez,Juan J. Velasco Vélez,Katarzyna Skorupska,Katarzyna Skorupska,Eugen Stotz,Axel Knop-Gericke,Robert Schlögl,Robert Schlögl,Rosa Arrigo +13 more
TL;DR: In this paper, a batch-type two-electrode cell prototype and the improvements attained with a continuous flow three-electron cell were presented for studying interfacial structural dynamics of energy materials under near ambient pressure X-ray photoelectron spectroscopy.
Book ChapterDOI
Catalyst Electronic Surface Structure Under Gas and Liquid Environments
Alexander Yu. Klyushin,Alexander Yu. Klyushin,Rosa Arrigo,Verena Pfeifer,Verena Pfeifer,Travis Jones,Juan J. Velasco Vélez,Axel Knop-Gericke +7 more
TL;DR: In this article, the potential of ambient pressure X-ray photoelectron spectroscopy for the estimation of the electronic structure of gas-solid and liquid-solid interfaces active in catalytic processes is demonstrated.