Origin of the Low Overpotential for Isopropanol Oxidation on Pt-Ru Electrocatalysts

Simanenko A, Samal PK, Hübsch R, Škvára J, Yang J, Kastenmeier M, Winkler F, Skála T, Tsud N, Mehl S, Mysliveček J, Brummel O, Lykhach Y, Libuda J (2024)

Publication Type: Journal article

Publication year: 2024

Journal

ACS Energy Letters American Chemical Society

Pages Range: 4875-4882

DOI: 10.1021/acsenergylett.4c01987

Abstract

Electrochemically active liquid organic hydrogen carrier (EC-LOHC) technology is an emerging solution for safe and environmentally friendly hydrogen storage and energy conversion based on the use of organic redox-active compounds, such as the isopropanol/acetone couple. In this work, we identify the nature of the active state of the Pt-Ru electrocatalyst that provides the lowest overpotential and, thus, the highest catalytic activity. Toward this aim we employed ex situ electrochemical synchrotron radiation photoelectron spectroscopy (SRPES) and scanning tunneling microscopy (STM) in combination with in situ electrochemical infrared reflection absorption spectroscopy (EC-IRRAS). We show that the lowest overpotentials are not observed for Pt-Ru surface alloys but only in the presence of ultrasmall metallic Pt aggregates formed by dealloying of Pt-Ru catalysts upon oxidation and reduction cycles between 0.0 and 1.5 VRHE. By tuning the initial composition of the Pt-Ru surface alloy, we maximize the density of active Pt aggregates.

Authors with CRIS profile

Alexander Simanenko Lehrstuhl für Katalytische Grenzflächenforschung Robert Hübsch Lehrstuhl für Katalytische Grenzflächenforschung Juntao Yang Lehrstuhl für Katalytische Grenzflächenforschung Maximilian Kastenmeier Lehrstuhl für Katalytische Grenzflächenforschung Florian Winkler Lehrstuhl für Katalytische Grenzflächenforschung Olaf Brummel Lehrstuhl für Katalytische Grenzflächenforschung Yaroslava Lykhach Lehrstuhl für Katalytische Grenzflächenforschung Jörg Libuda Lehrstuhl für Katalytische Grenzflächenforschung

Involved external institutions

Univerzita Karlova v Praze / Charles University in Prague CZ Czech Republic (CZ) Elettra Sincrotrone Trieste S.C.p.A. IT Italy (IT)

How to cite

APA:

Simanenko, A., Samal, P.K., Hübsch, R., Škvára, J., Yang, J., Kastenmeier, M.,... Libuda, J. (2024). Origin of the Low Overpotential for Isopropanol Oxidation on Pt-Ru Electrocatalysts. ACS Energy Letters, 4875-4882. https://doi.org/10.1021/acsenergylett.4c01987

MLA:

Simanenko, Alexander, et al. "Origin of the Low Overpotential for Isopropanol Oxidation on Pt-Ru Electrocatalysts." ACS Energy Letters (2024): 4875-4882.

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