Wataru Yoshimune¹, Juliana B. Falqueto¹, Adam H. Clark¹, Nur Sena Yüzbasi², Thomas Graule², Dominika Baster¹, Mario El Kazzi¹, Thomas J. Schmidt¹, Emiliana Fabbri^1*

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.

Description

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, La_0.2Sr_0.8CoO_3–δ, La_0.2Sr_0.8Co_0.8Fe_0.2O_3–δ, La_0.5Sr_1.5CoO_4–δ and CoO_x 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).

Materials Cloud sections using this data

Files

File name	Size	Description
raw data.csv MD5md5:ac1dba06e9004d5e42dae8f51e547cb8	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

Keywords

alkaline water electrolysis phosphate ion functionalization neutral ph Experimental