Functional macroporous iron-phosphorous films by electrodeposition on colloidal crystal templates
Golvano Escobal, Irati (Universitat Autònoma de Barcelona. Departament de Física)
De Paz Castany, Roger (Universitat Autònoma de Barcelona. Departament de Física)
Alcantara, Carlos (Eidgenössische Technische Hochschule Zürich. Institut für Robotik und Intelligente Systeme)
Pané i Vidal, Salvador (Eidgenössische Technische Hochschule Zürich. Institut für Robotik und Intelligente Systeme)
García-Lecina, Eva (CIDETEC)
Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física)
Pellicer Vilà, Eva Maria (Universitat Autònoma de Barcelona. Departament de Física)

Date:	2019
Abstract:	Pseudo-ordered macroporous iron-phosphorous (Fe-P) films have been electrodeposited potentiostatically from a citrate-sulfate bath onto Au surfaces pre-patterned with a colloidal crystal mask of polystyrene spheres of 350 nm in diameter. The electrolyte contained sodium hypophosphite as the P source, enabling the incorporation of 6-14 at. % P. For comparative purposes, continuous films have been obtained galvanostatically on unpatterned Au surfaces. In both cases, the P content could be varied to a certain extent by adjusting the deposition potential or current density. Tunable microstructure and magnetic response was observed due to the dissimilar chemical composition, with coercivity values being larger in the macroporous films. Additionally, wettability analyses showed that these were more hydrophobic, reaching contact angle values of about 130∘. In spite of their hydrophobic character, the samples were catalytic toward oxygen evolution reaction (OER) in alkaline media. The macroporous Fe-P films showed faster kinetics for OER than their nonporous counterparts. Our results show that electrodeposited porous Fe-P based materials show an interesting combination of properties which make them appealing for applications including water cleaning, soft-magnetic components, or electrocatalytic production of oxygen, to name a few.
Grants:	European Commission 648454 Ministerio de Economía y Competitividad MAT2017-86357-C3-2-R Ministerio de Economía y Competitividad MAT2017-86357-C3-1-R Ministerio de Economía y Competitividad RYC-2012-10839 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-292
Note:	Altres ajuts: Oréal-Unesco For Women in Science programme. The authors would like to acknowledge networking support by the COST Action e-MINDS MP1407
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Subject:	Electrodeposition ; Iron-phosphorous ; Macroporous films ; Magnetic properties ; Wettability
Published in:	Electrochimica acta, Vol. 313 (Aug. 2019) , p. 211-222, ISSN 1873-3859

DOI: 10.1016/j.electacta.2019.05.009

Preprint 41 p, 932.7 KB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Group of Smart Nanoengineered Materials, Nanomechanics and Nanomagnetism (Gnm3) > SPIN-PORICS
Articles > Research articles
Articles > Published articles