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Open AccessArticle

Tuning the Co Oxidation State in Ba0.5Sr0.5Co0.8Fe0.2O3-δ by Flame Spray Synthesis Towards High Oxygen Evolution Reaction Activity

1
Energy and Environment Research Division, Paul Scherrer Institute PSI, Forschungsstrasse 111, CH-5232 Villigen PSI, Switzerland
2
Laboratory for High Performance Ceramics, Empa-Swiss Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, Switzerland
3
Laboratory of Physical Chemistry, ETH Zurich-Swiss Federal Institute of Technology in Zurich, CH-8093 Zürich, Switzerland
*
Authors to whom correspondence should be addressed.
Catalysts 2020, 10(9), 984; https://doi.org/10.3390/catal10090984
Received: 31 July 2020 / Revised: 17 August 2020 / Accepted: 19 August 2020 / Published: 1 September 2020
(This article belongs to the Special Issue Synthesis and Applications of Nano-Catalytic Materials)
The perovskite-type oxide Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) is known as a highly active and stable oxygen evolution reaction (OER) electrocatalyst composited out of non-noble metals. The possibility of using the scalable flame spray synthesis (FSS) technique for the production of BSCF nanoparticles intensified the interest in this material for a future application in an alkaline water electrolyzer. A possible scale-up would require the optimization of the synthesis parameters to maximize the production rate. To further understand the influence of the synthesis parameters of the tunable FSS on the OER activity of BSCF, a systematic study was carried out by producing BSCF with different total metal concentrations (CTM), flow rates of the precursor solution (FRPS) and of the dispersion gas (FRDG). This study reveals that all three parameters have a direct impact on the OER activity of BSCF—measured in a rotating disc electrode (RDE) setup—due to the controllability of the initial Co and Fe oxidation state—indicated by X-ray absorption spectroscopy (XAS) measurements—and with that also of the oxygen vacancy concentration in the as-synthesized BSCF. This controllability enables the optimization of the OER activity of BSCF and emphasizes the importance of having Co in a lower initial oxidation state for reaching a high electrocatalytic performance. View Full-Text
Keywords: alkaline water electrolyzer; water splitting; oxygen evolution reaction; perovskite-type oxide; flame spray synthesis; rotating disc electrode; X-ray absorption spectroscopy; Co K-edge; oxygen vacancy; oxy(hydroxide) alkaline water electrolyzer; water splitting; oxygen evolution reaction; perovskite-type oxide; flame spray synthesis; rotating disc electrode; X-ray absorption spectroscopy; Co K-edge; oxygen vacancy; oxy(hydroxide)
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MDPI and ACS Style

Aegerter, D.; Borlaf, M.; Fabbri, E.; Clark, A.H.; Nachtegaal, M.; Graule, T.; Schmidt, T.J. Tuning the Co Oxidation State in Ba0.5Sr0.5Co0.8Fe0.2O3-δ by Flame Spray Synthesis Towards High Oxygen Evolution Reaction Activity. Catalysts 2020, 10, 984. https://doi.org/10.3390/catal10090984

AMA Style

Aegerter D, Borlaf M, Fabbri E, Clark AH, Nachtegaal M, Graule T, Schmidt TJ. Tuning the Co Oxidation State in Ba0.5Sr0.5Co0.8Fe0.2O3-δ by Flame Spray Synthesis Towards High Oxygen Evolution Reaction Activity. Catalysts. 2020; 10(9):984. https://doi.org/10.3390/catal10090984

Chicago/Turabian Style

Aegerter, Dino; Borlaf, Mario; Fabbri, Emiliana; Clark, Adam H.; Nachtegaal, Maarten; Graule, Thomas; Schmidt, Thomas J. 2020. "Tuning the Co Oxidation State in Ba0.5Sr0.5Co0.8Fe0.2O3-δ by Flame Spray Synthesis Towards High Oxygen Evolution Reaction Activity" Catalysts 10, no. 9: 984. https://doi.org/10.3390/catal10090984

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