Issue 27, 2024

Unlocking the chemical environment of nitrogen in perovskite-type oxides

Abstract

Nitrogen (N) doping of perovskite-type oxides is an effective method for enhancing their photocatalytic performance. Quantitative and qualitative analyses of the doped N species are essential for a deeper understanding of the catalytic activity enhancement mechanism. However, examining the N environment in perovskite-type oxides, particularly in the bulk, using conventional analytical techniques, such as X-ray photoelectron spectroscopy (XPS), is challenging. In this study, we propose a new analytical technique, advanced temperature-programmed desorption (TPD) up to 1600 °C, to complement the conventional methods. TPD can quantify all N species in bulk oxides. Moreover, it facilitates chemical speciation of N environments, such as substitutional and interstitial N species. This is verified by XPS, CHN elemental analysis, X-ray absorption spectroscopy, and in situ diffuse reflectance infrared Fourier-transform spectroscopy. This study demonstrates the feasibility of advanced TPD as a new analytical method that offers comprehensive information on the N species within N-doped oxide materials at the bulk level.

Graphical abstract: Unlocking the chemical environment of nitrogen in perovskite-type oxides

Supplementary files

Article information

Article type
Edge Article
Submitted
20 3 2024
Accepted
15 5 2024
First published
27 6 2024
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2024,15, 10350-10358

Unlocking the chemical environment of nitrogen in perovskite-type oxides

S. Shimizu, T. Yoshii, G. Nishikawa, J. Wang, S. Yin, E. Kobayashi and H. Nishihara, Chem. Sci., 2024, 15, 10350 DOI: 10.1039/D4SC01850H

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