Al-Murish, M., Autade, V., Kumi Barimah, E. orcid.org/0000-0003-4841-9866 et al. (3 more authors) (2023) Engineering of Solar-Energy Harvesting Tb3+-ion doped CdS Quantum Dot Glasses for Photodissociation of Hydrogen Sulphide. ACS Applied Energy Materials, 6 (17). pp. 8875-8888. ISSN 2574-0962
Abstract
The photocatalytic properties of CdS quantum dots (Q-dots) and Tb3+-doped CdS Q-dots dispersed in a borosilicate glass matrix were investigated for the photodissociation of hydrogen sulfide (H2S) into hydrogen (H2) gas and elemental sulfur (S). The Q-dot-containing glass samples were fabricated using the conventional melt-quench method and isothermal annealing between 550 and 600 °C for 6 h for controlling the growth of CdS and Tb3+-ion-doped CdS Q-dots. The structure, electronic band gap, and spectroscopic properties of the Q-dots formed in the glass matrix after annealing were analyzed using Raman and UV–visible spectroscopies, X-ray powder diffraction, and transmission electron microscopy. With increasing annealing temperature, the average size range of the Q-dots increased, corresponding to the decrease of electronic band gap from 3.32 to 2.24 eV. For developing the model for photocatalytic energy exchange, the excited state lifetime and photoluminescence emission were investigated by exciting the CdS and Tb3+-doped CdS quantum states with a 450 nm source. The results from the photoluminescence and lifetime demonstrated that the Tb3+-CdS photodissociation energy exchange is more efficient from the excited Q-dot states compared to the CdS Q-dot glasses. Under natural sunlight, the hydrogen production experiment was conducted, and an increase of 26.2% in hydrogen evolution rate was observed from 0.02 wt % Tb3+-doped CdS (3867 μmol/h/0.5 g) heat-treated at 550 °C when compared to CdS Q-dot glass with a similar heat treatment temperature (3064 μmol/h/0.5 g). Furthermore, the photodegradation stability of 0.02 wt % Tb3+-CdS was analyzed by reusing the catalyst glass powders four times with little evidence of degradation.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | Copyright © 2022 The Authors. Published by American Chemical Society. This publication is licensed under CC-BY 4.0. |
Keywords: | photocatalysis, hydrogen production, Q-dot glass, photodissociation, hydrogen sulfide, rare-earth doping |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 09 Oct 2023 12:23 |
Last Modified: | 09 Oct 2023 15:02 |
Published Version: | https://pubs.acs.org/doi/10.1021/acsaem.3c01488 |
Status: | Published |
Publisher: | American Chemical Society |
Identification Number: | 10.1021/acsaem.3c01488 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:202520 |