NOx and CO2 conversion efficiency of nitrogen-modified strontium titanate

Ágoston, Áron and Balassa, Lilla and Yadav, M. and Hajdu, Cintia and Ballai, Gergő and Gyulavári, Tamás and Solymos, Karolina and Kukovecz, Ákos and Kónya, Zoltán and Lehoczky, P.S. and Janovák, László and Pap, Zsolt (2026) NOx and CO2 conversion efficiency of nitrogen-modified strontium titanate. CERAMICS INTERNATIONAL, 52 (13). pp. 22770-22780. ISSN 0272-8842

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Abstract

Nitrogen doping and surface modification are widely used strategies to enhance the photocatalytic performance of perovskite oxides such as SrTiO3. These approaches can increase the lifetime of charge carriers and locally modify the electron density through the incorporation of elements with different electronegativity or surface modification, thus promoting NOx and CO2 conversion. In this work, SrTiO3 was modified via a simple synthesis method, resulting in a nominal nitrogen content of 0.42–11.14 at.%. The sample containing 7.71 at.% nitrogen exhibited the highest photocatalytic activity, achieving a 67% improvement in NOx conversion and a 2.2-fold enhancement in CO2 conversion compared to unmodified SrTiO3. Characterization results showed that low nitrogen precursor concentrations led to only limited nitrogen incorporation, which did not significantly affect the photocatalytic activity. However, surface amine groups were already detectable at low precursor amounts, while higher precursor amounts promoted increased nitrogen incorporation into the SrTiO3 photocatalysts. © 2026 Published by Elsevier Ltd.

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