In Situ Electrochemical Oxidation of Cu2S into CuO Nanowires as a Durable and Efficient Electrocatalyst for Oxygen Evolution Reaction
Zuo, Yong (Institut de Recerca en Energia de Catalunya)
Liu, Yongpeng (École Polytechnique Fédérale de Lausanne)
Li, Junshan (Institut de Recerca en Energia de Catalunya)
Du, Ruifeng (Institut de Recerca en Energia de Catalunya)
Han, Xu (Institut Català de Nanociència i Nanotecnologia)
Zhang, Ting (Institut Català de Nanociència i Nanotecnologia)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Jiménez Divins, Nuria (Universitat Politècnica de Catalunya. Departament d'Enginyeria Química)
Llorca, Jordi (Universitat Politècnica de Catalunya. Departament d'Enginyeria Química)
Guijarro, Néstor (École Polytechnique Fédérale de Lausanne)
Sivula, Kevin (École Polytechnique Fédérale de Lausanne)
Cabot, Andreu (Institut de Recerca en Energia de Catalunya)

Data:	2019
Resum:	Development of cost-effective oxygen evolution catalysts is of capital importance for the deployment of large-scale energy-storage systems based on metal-air batteries and reversible fuel cells. In this direction, a wide range of materials have been explored, especially under more favorable alkaline conditions, and several metal chalcogenides have particularly demonstrated excellent performances. However, chalcogenides are thermodynamically less stable than the corresponding oxides and hydroxides under oxidizing potentials in alkaline media. Although this instability in some cases has prevented the application of chalcogenides as oxygen evolution catalysts and it has been disregarded in some others, we propose to use it in our favor to produce high-performance oxygen evolution catalysts. We characterize here the in situ chemical, structural, and morphological transformation during the oxygen evolution reaction (OER) in alkaline media of CuS into CuO nanowires, mediating the intermediate formation of Cu(OH). We also test their OER activity and stability under OER operation in alkaline media and compare them with the OER performance of Cu(OH) and CuO nanostructures directly grown on the surface of a copper mesh. We demonstrate here that CuO produced from in situ electrochemical oxidation of CuS displays an extraordinary electrocatalytic performance toward OER, well above that of CuO and Cu(OH) synthesized without this transformation.
Ajuts:	Ministerio de Economía y Competitividad ENE2016-77798-C4-3-R Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-128 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-327 Ministerio de Economía y Competitividad ENE2017-85087-C3 Ministerio de Economía y Competitividad SEV-2017-0706
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Matèria:	Alkaline conditions ; Electrocatalytic performance ; Energy storage systems ; Intermediate formation ; Morphological transformations ; Oxidizing potentials ; Oxygen evolution reaction ; Reversible fuel cells
Publicat a:	Chemistry of materials, Vol. 31, Issue 18 (September 2019) , p. 7732-7743, ISSN 1520-5002

DOI: 10.1021/acs.chemmater.9b02790

Preprint 30 p, 4.3 MB

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