Table · dataset · 2021
Data for Hydrothermal synthesis of iridium-substituted NaTaO3 perovskites
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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%.
Description
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.
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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.<br><br>Data underpinning article "Hydrothermal Synthesis of Iridium-Substituted NaTaO3 Perovskites" by David L. Burnett, Christopher D. Vincent, Jasmine A. Clayton, Reza J. Kashtiban and Richard I. Walton 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).
Links
Where it is published
- DOI doi.org/10.82444/warw.33824224.v1 ↗
DOI / persistent id · from figshare com
Catalogue records · 1
- OAI-PMH record api.figshare.com/v2/oai?verb=GetRecord&metadataPrefix=oai_dc&identifier=oai%3Af… ↗
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Topics
- From keywords
- Astronomy & Astrophysics · Chemistry · Computer Science & AI · Earth & Environmental Science · Economics & Finance · Engineering · Humanities · Life Sciences · Materials Science · Medicine & Health · Ocean & Atmospheric Science · Social Science
- Inferred from text
- Inorganic chemistry 74% · Microscopy 75%
Provenance · 1 source records, 19 field assertions
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| figshare | oai:figshare.com:article/33824224 | 11 d ago | JSON v1 |
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