Origin of extended visible light absorption in nitrogen-doped CuTa<sub>2</sub>O<sub>6</sub> perovskites: the role of copper defects-Reference-Cited by-同舟云学术

Origin of extended visible light absorption in nitrogen-doped CuTa₂O₆ perovskites: the role of copper defects

Published:2024-04-01 Issue:4 Volume:79 Page:229-242
ISSN:0932-0776
Container-title:Zeitschrift für Naturforschung B
language:en
Short-container-title:

Author:

Weiss Morten¹,Hofmann Anja¹,Marschall Roland¹

Affiliation:

1. Department of Chemistry , University of Bayreuth , Universitätsstraße 30, 95440 Bayreuth , Germany

Abstract

Abstract The optical band gap of the semiconductor CuTa2O6, synthesised via solid-state reaction, can be greatly reduced by annealing in ammonia, which leads to a significant red-shift of the visible light absorption. Using X-ray photoelectron spectroscopy (XPS), we have shown that this absorption extension does not result from the incorporation of nitrogen, but can be attributed to copper defects formed under the reducing conditions of ammonia treatment. Photocatalytic hydrogen evolution experiments were used to investigate the influence of these defects on the photocatalytic performance. We have further shown that CuTa2O6 with similar increased visible light absorption can be prepared by annealing with an organic reducing agent – sodium citrate – in inert gas atmosphere.

Publisher

Walter de Gruyter GmbH

Link

https://www.degruyter.com/document/doi/10.1515/znb-2023-0094/pdf

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