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Data for 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) Data for Hydrothermal synthesis of iridium-substituted NaTaO3 perovskites. [Dataset]
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Official URL: http://wrap.warwick.ac.uk/153846/
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: | Dataset | ||||||
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Subjects: | Q Science > QD Chemistry | ||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||||
Type of Data: | Experimental data underpinning research article | ||||||
Library of Congress Subject Headings (LCSH): | Perovskite, Nanostructured materials, Nanocrystals, Photocatalysis, Crystallization | ||||||
Publisher: | University of Warwick, Department of Chemistry | ||||||
Official Date: | 10 June 2021 | ||||||
Dates: |
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Status: | Not Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Media of Output (format): | ASCII | ||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||
Copyright Holders: | University of Warwick | ||||||
Description: | Data underpinning article "Hydrothermal Synthesis of Iridium-Substituted NaTaO3 Perovskites" All data are ascii format and are labelled according to the figures in the paper. Figure 1: Powder XRD data. Two-columns: diffraction angle (two-theta) and intensity. Figure 5: X-ray absorption spectroscopy. Two columns: energy and normalised absorption. Figure 7: UV-Vis spectra. Two columns: Incident energy and normalised absorption. Figure 8: Powder XRD data. Single x column and multiple y columns: diffraction angle (two-theta) and intensity with increasing temperature in 50 oC intervals (30,50,100...900). |
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Date of first compliant deposit: | 9 June 2021 | ||||||
Date of first compliant Open Access: | 10 June 2021 | ||||||
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