Issue 8, 2023

Activation of hydrogen-evolution reactivity in an Rh-doped SrTiO3 photocatalyst under visible-light irradiation by loading with controlled platinum nanoclusters

Abstract

Rhodium-doped strontium titanate (SrTiO3:Rh)-based photocatalysts have long been studied because they can produce hydrogen (H2) from visible light and water in Z-scheme water-splitting systems. However, the H2-evolution reaction (HER) of SrTiO3:Rh is the rate-limiting step in such a system, so further improvement of the HER activity of SrTiO3:Rh is desired to enhance Z-scheme water splitting. In this study, we synthesize hydrophilic ∼1 nm platinum nanoclusters (Pt NCs) using a ligand-exchange method while maintaining the geometric structure of the corresponding hydrophobic ∼1 nm Pt NC, and we load the monodispersed Pt NCs onto SrTiO3:Rh. The Pt NC-loaded SrTiO3:Rh exhibits HER activity that is 30% higher than that of the Pt cocatalyst-loaded SrTiO3:Rh prepared using the conventional photodeposition method. This work also demonstrates that Z-scheme water splitting proceeds stoichiometrically using the Pt NC-loaded SrTiO3:Rh as the H2-evolution photocatalyst, bismuth vanadate as an oxygen-evolution photocatalyst, and Fe2+ as a mediator.

Graphical abstract: Activation of hydrogen-evolution reactivity in an Rh-doped SrTiO3 photocatalyst under visible-light irradiation by loading with controlled platinum nanoclusters

Supplementary files

Article information

Article type
Paper
Submitted
12 apr 2023
Accepted
07 iyn 2023
First published
07 iyn 2023
This article is Open Access
Creative Commons BY-NC license

Energy Adv., 2023,2, 1148-1154

Activation of hydrogen-evolution reactivity in an Rh-doped SrTiO3 photocatalyst under visible-light irradiation by loading with controlled platinum nanoclusters

D. Yazaki, T. Kawawaki, T. Tanaka, D. Hirayama, Y. Shingyouchi and Y. Negishi, Energy Adv., 2023, 2, 1148 DOI: 10.1039/D3YA00159H

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