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The role of phosphate functionalization on the oxygen evolution reaction activity of cobalt-based oxides at different pH values

Wataru Yoshimune1, Juliana B. Falqueto1, Adam H. Clark1, Nur Sena Yüzbasi2, Thomas Graule2, Dominika Baster1, Mario El Kazzi1, Thomas J. Schmidt1, Emiliana Fabbri1*

1 Energy and Environment Research Division, Paul Scherrer Institut (PSI), CH-5232 Villigen PSI, Switzerland

2 Laboratory for High Performance Ceramics, Empa, Swiss Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, Switzerland

* Corresponding authors emails: emiliana.fabbri@psi.ch
DOI10.24435/materialscloud:gh-w0 [version v1]

Publication date: Feb 13, 2023

How to cite this record

Wataru Yoshimune, Juliana B. Falqueto, Adam H. Clark, Nur Sena Yüzbasi, Thomas Graule, Dominika Baster, Mario El Kazzi, Thomas J. Schmidt, Emiliana Fabbri, The role of phosphate functionalization on the oxygen evolution reaction activity of cobalt-based oxides at different pH values, Materials Cloud Archive 2023.26 (2023), doi: 10.24435/materialscloud:gh-w0.


Cobalt-based oxides are active electrocatalysts for the oxygen evolution reaction (OER) in alkaline electrolytes. However, their OER activity at near-neutral pHs is generally low and more active OER catalysts at neutral pHs are desired for practical applications. Herein, La0.2Sr0.8CoO3–δ, La0.2Sr0.8Co0.8Fe0.2O3–δ, La0.5Sr1.5CoO4–δ and CoOx catalysts were prepared by the flame spray synthesis method and their surface was functionalized by a dry phosphate incorporation process. Small amount of P was incorporated on the surface of the catalyst (in the range of ppm). All the samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and soft and hard X-ray absorption spectroscopy (XAS) before and after the functionalization process. The electrocatalytic activity towards OER of the different nanoparticle catalysts was investigated in electrolytes with different pH values (pH = 7, 12.5, 13, and 13.5).

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File name Size Description
raw data.csv
4.8 MiB The folder contains the raw data related to XRD, hard XAS, soft XAS (sXAS), and XPS characterizations of the samples. In addition, electrochemical cyclic voltammetry (CVs) and Tafel plots are included.


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External references

Journal reference
W. Yoshimune, J. B. Falqueto, A. H. Clark, N. S. Yüzbasi, T. Graule, D. Baster, M. El Kazzi, T. J. Schmidt, E. Fabbri "(submitted)"


alkaline water electrolysis phosphate ion functionalization neutral ph Experimental

Version history:

2023.26 (version v1) [This version] Feb 13, 2023 DOI10.24435/materialscloud:gh-w0