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 mar 2024
Accepted
15 may 2024
First published
27 iyn 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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