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Hydrothermal synthesis of iridium-substituted NaTaO3 perovskites

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Burnett, David L., Vincent, Christopher D., Clayton, Jasmine A., Kashtiban, Reza J. and Walton, Richard I. (2021) Hydrothermal synthesis of iridium-substituted NaTaO3 perovskites. Nanomaterials, 11 (6). 1537. doi:10.3390/nano11061537 ISSN 1847-9804.

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Official URL: https://doi.org/10.3390/nano11061537

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Abstract

Iridium-containing NaTaO3 is produced using a one-step hydrothermal crystallisation from Ta2O5 and IrCl3 in an aqueous solution of 10 M NaOH in 40 vol H2O2 heated at 240 °C. Although a nominal replacement of 50 of Ta by Ir was attempted, the amount of Ir included in the perovskite oxide was only up to 15 mol. The materials are formed as crystalline powders comprising cube-shaped crystallites around 100 nm in edge length, as seen by scanning transmission electron microscopy. Energy dispersive X-ray mapping shows an even dispersion of Ir through the crystallites. Profile fitting of powder X-ray diffraction (XRD) shows expanded unit cell volumes (orthorhombic space group Pbnm) compared to the parent NaTaO3, while XANES spectroscopy at the Ir LIII-edge reveals that the highest Ir-content materials contain Ir4+. The inclusion of Ir4+ into the perovskite by replacement of Ta5+ implies the presence of charge-balancing defects and upon heat treatment the iridium is extruded from the perovskite at around 600 C in air, with the presence of metallic iridium seen by in situ powder XRD. The highest Ir-content material was loaded with Pt and examined for photocatalytic evolution of H2 from aqueous methanol. Compared to the parent NaTaO3, the Ir-substituted material shows a more than ten-fold enhancement of hydrogen yield with a significant proportion ascribed to visible light absorption.

Item Type: Journal Article
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Science, Engineering and Medicine > Science > Chemistry
Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Perovskite, Nanostructured materials, Nanocrystals, Photocatalysis, Crystallization
Journal or Publication Title: Nanomaterials
Publisher: MDPI Publishing
ISSN: 1847-9804
Official Date: 10 June 2021
Dates:
DateEvent
10 June 2021Published
7 June 2021Accepted
Volume: 11
Number: 6
Article Number: 1537
DOI: 10.3390/nano11061537
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 10 June 2021
Date of first compliant Open Access: 11 June 2021
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
EP/K503204/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
Is Part Of: 1
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