Bandgap Engineering in Novel Fluorite-Type Rare Earth High-Entropy Oxides (RE-HEOs) with Computational and Experimental Validation for Photocatalytic Water Splitting Applications - Research portal of Justus Liebig University Giessen:

Journal article

Bandgap Engineering in Novel Fluorite-Type Rare Earth High-Entropy Oxides (RE-HEOs) with Computational and Experimental Validation for Photocatalytic Water Splitting Applications

Authors list: Nundy, S; Tatar, D; Kojcinovic, J; Ullah, H; Ghosh, A; Mallick, TK; Meinusch, R; Smarsly, BM; Tahir, AA; Djerdj, I

Publication year: 2022

Journal: Advanced Sustainable Systems

Volume number: 6

Issue number: 7

ISSN: 2366-7486

DOI Link: https://doi.org/10.1002/adsu.202200067

Publisher: Wiley

Abstract:
Five different rare-earth-based nanocrystalline high entropy oxides (HEOs) with fluorite structure and average crystallite sizes between 6 and 8 nm are prepared and their photocatalytic behavior toward azo dye degradation and photoelectrochemical water splitting for hydrogen generation is examined. The cationic site in the fluorite lattice consists of five equimolar elements selected from the group of rare-earth elements including La, Ce, Pr, Eu, and Gd and second-row transition metals, Y and Zr. The studied HEOs exhibit bandgaps in the range from 1.91 to 3.0 eV and appropriate valence and conduction bands for water splitting. They reveal high photocatalytic activity that is mostly attributed to the accessibility of more photocatalytic active sites, which provide radicals responsible for the azo dye degradation. The materials successfully produce hydrogen by photocatalytic water splitting, suggesting the potential of HEOs as new photocatalysts. The photocatalytic performances of all studied HEOs outperform the single fluorite oxides or equivalent mixed oxides. The Ce0.2Zr0.2La0.2Pr0.2Y0.2O2 (CZLPY) engender hydrogen in 9.2 mu mol mg(-1) per hour that is much higher content than for pristine CeO2 material which amounts to 0.8 mu mol mg(-1) per hour.

Authors/Editors

- Uni.-Prof. Dr. Bernd Michael Smarsly

Citation Styles

Harvard Citation style: Nundy, S., Tatar, D., Kojcinovic, J., Ullah, H., Ghosh, A., Mallick, T., et al. (2022) Bandgap Engineering in Novel Fluorite-Type Rare Earth High-Entropy Oxides (RE-HEOs) with Computational and Experimental Validation for Photocatalytic Water Splitting Applications, Advanced Sustainable Systems, 6(7), Article 2200067. https://doi.org/10.1002/adsu.202200067

APA Citation style: Nundy, S., Tatar, D., Kojcinovic, J., Ullah, H., Ghosh, A., Mallick, T., Meinusch, R., Smarsly, B., Tahir, A., & Djerdj, I. (2022). Bandgap Engineering in Novel Fluorite-Type Rare Earth High-Entropy Oxides (RE-HEOs) with Computational and Experimental Validation for Photocatalytic Water Splitting Applications. Advanced Sustainable Systems. 6(7), Article 2200067. https://doi.org/10.1002/adsu.202200067