Halide-Doping Effect of Strontium Cobalt Oxide Electrocatalyst and the Induced Activity for Oxygen Evolution in an Alkaline Solution

Perovskites of strontium cobalt oxyhalides having the chemical formulae Sr2CoO4-xHx (H = F, Cl, and Br; x = 0 and 1) were prepared using a solid-phase synthesis approach and comparatively evaluated as electrocatalysts for oxygen ev...

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Autores principales:	Mohamed A. Ghanem, Mabrook S. Amer, Abdullah M. Al-Mayouf, Prabhakarn Arunachalam, Mark T. Weller
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	strontium cobalt oxyhalides electrocatalyst oxygen evolution reaction alkaline solution Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/182b774feb91414ea822adc99afb64b7
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spelling	oai:doaj.org-article:182b774feb91414ea822adc99afb64b72021-11-25T17:06:53ZHalide-Doping Effect of Strontium Cobalt Oxide Electrocatalyst and the Induced Activity for Oxygen Evolution in an Alkaline Solution10.3390/catal111114082073-4344https://doaj.org/article/182b774feb91414ea822adc99afb64b72021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4344/11/11/1408https://doaj.org/toc/2073-4344Perovskites of strontium cobalt oxyhalides having the chemical formulae Sr<sub>2</sub>CoO<sub>4-x</sub>H<sub>x</sub> (H = F, Cl, and Br; x = 0 and 1) were prepared using a solid-phase synthesis approach and comparatively evaluated as electrocatalysts for oxygen evolution in an alkaline solution. The perovskite electrocatalyst crystal phase, surface morphology, and composition were examined by X-ray diffraction, a scanning electron microscope, and energy-dispersive X-ray (EDX) mapping. The electrochemical investigations of the oxyhalides catalysts showed that the doping of F, Cl, or Br into the Sr<sub>2</sub>CoO<sub>4</sub> parent oxide enhances the electrocatalytic activity for the oxygen evolution reaction (OER) with the onset potential as well as the potential required to achieve a current density of 10 mA/cm<sup>2</sup> shifting to lower potential values in the order of Sr<sub>2</sub>CoO<sub>4</sub> (1.64, 1.73) > Sr<sub>2</sub>CoO<sub>3</sub>Br (1.61, 1.65) > Sr<sub>2</sub>CoO<sub>3</sub>Cl (1.53, 1.60) > Sr<sub>2</sub>CoO<sub>3</sub>F (1.50, 1.56) V vs. HRE which indicates that Sr<sub>2</sub>CoO<sub>3</sub>F is the most active electrode among the studied catalysts under static and steady-state conditions. Moreover, Sr<sub>2</sub>CoO<sub>3</sub>F demonstrates long-term stability and remarkably less charge transfer resistance (R<sub>ct</sub> = 36.8 ohm) than the other oxyhalide counterparts during the OER. The doping of the perovskites with halide ions particularly the fluoride-ion enhances the surface oxygen vacancy density due to electron withdrawal away from the Co-atom which improves the ionic and electronic conductivity as well as the electrochemical activity of the oxygen evolution in alkaline solution.Mohamed A. GhanemMabrook S. AmerAbdullah M. Al-MayoufPrabhakarn ArunachalamMark T. WellerMDPI AGarticlestrontium cobalt oxyhalideselectrocatalystoxygen evolution reactionalkaline solutionChemical technologyTP1-1185ChemistryQD1-999ENCatalysts, Vol 11, Iss 1408, p 1408 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	strontium cobalt oxyhalides electrocatalyst oxygen evolution reaction alkaline solution Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	strontium cobalt oxyhalides electrocatalyst oxygen evolution reaction alkaline solution Chemical technology TP1-1185 Chemistry QD1-999 Mohamed A. Ghanem Mabrook S. Amer Abdullah M. Al-Mayouf Prabhakarn Arunachalam Mark T. Weller Halide-Doping Effect of Strontium Cobalt Oxide Electrocatalyst and the Induced Activity for Oxygen Evolution in an Alkaline Solution
description	Perovskites of strontium cobalt oxyhalides having the chemical formulae Sr<sub>2</sub>CoO<sub>4-x</sub>H<sub>x</sub> (H = F, Cl, and Br; x = 0 and 1) were prepared using a solid-phase synthesis approach and comparatively evaluated as electrocatalysts for oxygen evolution in an alkaline solution. The perovskite electrocatalyst crystal phase, surface morphology, and composition were examined by X-ray diffraction, a scanning electron microscope, and energy-dispersive X-ray (EDX) mapping. The electrochemical investigations of the oxyhalides catalysts showed that the doping of F, Cl, or Br into the Sr<sub>2</sub>CoO<sub>4</sub> parent oxide enhances the electrocatalytic activity for the oxygen evolution reaction (OER) with the onset potential as well as the potential required to achieve a current density of 10 mA/cm<sup>2</sup> shifting to lower potential values in the order of Sr<sub>2</sub>CoO<sub>4</sub> (1.64, 1.73) > Sr<sub>2</sub>CoO<sub>3</sub>Br (1.61, 1.65) > Sr<sub>2</sub>CoO<sub>3</sub>Cl (1.53, 1.60) > Sr<sub>2</sub>CoO<sub>3</sub>F (1.50, 1.56) V vs. HRE which indicates that Sr<sub>2</sub>CoO<sub>3</sub>F is the most active electrode among the studied catalysts under static and steady-state conditions. Moreover, Sr<sub>2</sub>CoO<sub>3</sub>F demonstrates long-term stability and remarkably less charge transfer resistance (R<sub>ct</sub> = 36.8 ohm) than the other oxyhalide counterparts during the OER. The doping of the perovskites with halide ions particularly the fluoride-ion enhances the surface oxygen vacancy density due to electron withdrawal away from the Co-atom which improves the ionic and electronic conductivity as well as the electrochemical activity of the oxygen evolution in alkaline solution.
format	article
author	Mohamed A. Ghanem Mabrook S. Amer Abdullah M. Al-Mayouf Prabhakarn Arunachalam Mark T. Weller
author_facet	Mohamed A. Ghanem Mabrook S. Amer Abdullah M. Al-Mayouf Prabhakarn Arunachalam Mark T. Weller
author_sort	Mohamed A. Ghanem
title	Halide-Doping Effect of Strontium Cobalt Oxide Electrocatalyst and the Induced Activity for Oxygen Evolution in an Alkaline Solution
title_short	Halide-Doping Effect of Strontium Cobalt Oxide Electrocatalyst and the Induced Activity for Oxygen Evolution in an Alkaline Solution
title_full	Halide-Doping Effect of Strontium Cobalt Oxide Electrocatalyst and the Induced Activity for Oxygen Evolution in an Alkaline Solution
title_fullStr	Halide-Doping Effect of Strontium Cobalt Oxide Electrocatalyst and the Induced Activity for Oxygen Evolution in an Alkaline Solution
title_full_unstemmed	Halide-Doping Effect of Strontium Cobalt Oxide Electrocatalyst and the Induced Activity for Oxygen Evolution in an Alkaline Solution
title_sort	halide-doping effect of strontium cobalt oxide electrocatalyst and the induced activity for oxygen evolution in an alkaline solution
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/182b774feb91414ea822adc99afb64b7
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Halide-Doping Effect of Strontium Cobalt Oxide Electrocatalyst and the Induced Activity for Oxygen Evolution in an Alkaline Solution

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