Affiliation:
1. Dipartimento di Ingegneria Civile dell'Energia dell'Ambiente e dei Materiali (DICEAM) Università “Mediterranea” Via Zehender, Loc. Feo di Vito Reggio Calabria 89122 Italy
2. National Reference Center for Electrochemical Energy Storage (GISEL) Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM) Firenze 50121 Italy
3. Dipartimento di Ingegneria Università di Messina Contrada di Dio, Vill. Sant'Agata Messina 98166 Italy
4. Laboratorio di Nanotecnologie Istituto di Scienze e Tecnologie Chimiche “Giulio Natta” (SCITEC) Consiglio Nazionale delle Ricerche Via Fantoli 16/15 Milano 20138 Italy
5. Section of Chemistry for the Technology (ChemTech) Department of Industrial Engineering University of Padova Via Marzolo 9 Padova (PD) 35131 Italy
6. Department of Chemistry IRIS Adlershof & The Center for the Science of Materials Berlin Humboldt‐Universität zu Berlin Brook‐Taylor‐Str. 2 12489 Berlin Germany
Abstract
AbstractDefect‐engineering is a viable strategy to improve the activity of nanocatalysts for the oxygen evolution reaction (OER), whose slow kinetics still strongly limits the broad market penetration of electrochemical water splitting as a sustainable technology for large‐scale hydrogen production. High‐entropy spinel oxides (HESOs) are in focus due to their great potential as low‐cost OER electrocatalysts. In this work, electrospun HESO nanofibers (NFs), based on (Cr,Mn,Fe,Co,Ni), (Cr,Mn,Fe,Co,Zn) and (Cr,Mn,Fe,Ni,Zn) combinations, with granular architecture and oxygen‐deficient surface are produced by calcination at low temperature (600 or 500 °C), characterized by a combination of benchtop analytical techniques and evaluated as electrocatalysts for OER in alkaline medium. The variation of HESO composition and calcination temperature produces complex and interdependent changes in the morphology of the fibers, crystallinity and inversion degree of the spinel oxide, concentration of the oxygen‐vacancies, cation distribution in the lattice, which mirror on different electrochemical properties of the fibers. The best electrocatalytic performance (overpotential and Tafel slope at 10 mA cm−2: 360 mV and 41 mV dec−1, respectively) pertains to (Cr1/5Mn1/5Fe1/5Co1/5Ni1/5)3O4 NFs calcined at 500 °C and results from the lower outer 3d‐electron number, eg filling closer to its optimal value and higher occupation of 16d sites by the most redox‐active species.
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials
Cited by
2 articles.
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