Novel design of photocatalyst coaxial ferromagnetic core and semiconducting shell microwire architecture

Author(s)

Sombrio, G. ^[1] ; Pomar, C. A. D. ^[1] ; de Oliveira, L. S. ^[1] ; Freitas, A. L. M. ^[1] ; Souza, F. L. ^[1] ; Souza, J. A. ^[1]

Affiliation

^[1] Univ Fed ABC, BR-09210580 Santo Andre, SP - Brazil

• Document type: Journal article
• Source: JOURNAL OF CATALYSIS; v. 370, p. 61-69, FEB 2019.
• Web of Science Citations: 1

Abstract

We report a novel design of coaxial core-shell magnetic-semiconductor microwire, as a catalyst under sunlight irradiation. The nano/micro hierarchical architecture-like device is comprised of a coaxial core-shell microwire where the core is the ferromagnetic Fe metal and the shell is formed by a semi-conducting hematite layer. The fabrication process of our substrate-free device is simply based on controlled thermal oxidation process revealing a simple and low-cost method. The hematite outer microlayer has a mesoporous structure decorated with nanowires. The ferromagnetic and metallic core assume fundamental importance as to mechanical stability, collect the generated photoelectrons, and to be removed back from the dye solution by a magnetic field gradient or simply a magnet. This nano/micro device has exhibited photocatalytic activity to degrade the methylene blue dye under simulated sunlight irradiation. Additionally, the coaxial magnetic/semiconducting can also be designed as a photoanode to drive water oxidation reaction. The coaxial magnetic/semiconducting photoanode response has shown good chemical stability and long activity under simulated sunlight radiation. In fact, this designed architecture gives novel perspective in the development of substrate free photocatalyst. (C) 2018 Elsevier Inc. All rights reserved. (AU)

• FAPESP's process: 17/02317-2 - Interfaces in materials: electronic, magnetic, structural and transport properties
• Grantee: Adalberto Fazzio
• Support Opportunities: Research Projects - Thematic Grants