Issue 17, 2023

Interlayer modification and single-layer exfoliation of the Ruddlesden–Popper perovskite oxynitride K2LaTa2O6N to improve photocatalytic H2 evolution activity

Abstract

Modification of the interlayer nanospaces of lamellar solids is an effective means of enhancing the physical properties and chemical functions of such materials. The present work demonstrates the interlayer modification of the layered perovskite oxynitride K2LaTa2O6N, a photocatalyst having a ∼600 nm absorption edge and exhibiting visible-light-driven H2 evolution activity. This material was subjected to various interlayer modifications, including H+/K+ exchange, ethylamine (EA) intercalation and exfoliation with tetra(n-butyl)ammonium hydroxide (with subsequent restacking) while maintaining its capacity for visible light absorption. H2 evolution activity from aqueous methanol with the aid of an optimal amount of a Pt cocatalyst was improved by a factor of approximately 60 following EA intercalation to increase the interlayer spacing of the host material. However, subsequent exfoliation-restacking to yield flocculated nanosheets led to a decrease in activity as compared with the EA-intercalated specimen. The present results indicate that the intercalation of EA provided interlayer nanospaces suitable for Pt cocatalyst loading and so promoted the photocatalytic H2 evolution reaction, while the restacked nanosheets did not provide space for Pt loading.

Graphical abstract: Interlayer modification and single-layer exfoliation of the Ruddlesden–Popper perovskite oxynitride K2LaTa2O6N to improve photocatalytic H2 evolution activity

Supplementary files

Article information

Article type
Paper
Submitted
06 Mar 2023
Accepted
11 Apr 2023
First published
11 Apr 2023

J. Mater. Chem. A, 2023,11, 9485-9492

Author version available

Interlayer modification and single-layer exfoliation of the Ruddlesden–Popper perovskite oxynitride K2LaTa2O6N to improve photocatalytic H2 evolution activity

Y. Shiroma, H. Mogi, T. Mashiko, S. Yasuda, S. Nishioka, T. Yokoi, S. Ida, K. Kimoto and K. Maeda, J. Mater. Chem. A, 2023, 11, 9485 DOI: 10.1039/D3TA01387A

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