Next Article in Journal / Special Issue
Synergistic Effect of Dielectric Barrier Discharge Plasma and TiO2-Pillared Montmorillonite on the Degradation of Rhodamine B in an Aqueous Solution
Previous Article in Journal
Remembering Professor Jose Luis García Fierro (1948–2020)
Previous Article in Special Issue
Development and Validation of a LC-MS/MS Method for Determination of Multi-Class Antibiotic Residues in Aquaculture and River Waters, and Photocatalytic Degradation of Antibiotics by TiO2 Nanomaterials
Article

Core-Shell Nanostructures of Graphene-Wrapped CdS Nanoparticles and TiO2 ([email protected]@TiO2): The Role of Graphene in Enhanced Photocatalytic H2 Generation

1
Department of Chemical Engineering, Norwegian University of Science and Technology (NTNU), Sem Sælands vei 4, NO-7491 Trondheim, Norway
2
SINTEF Industry, P. O. Box 4760, Torgarden, NO-7465 Trondheim, Norway
*
Author to whom correspondence should be addressed.
Catalysts 2020, 10(4), 358; https://doi.org/10.3390/catal10040358
Received: 6 March 2020 / Revised: 19 March 2020 / Accepted: 22 March 2020 / Published: 25 March 2020
(This article belongs to the Special Issue Recent Advances in TiO2 Photocatalysts)
Aiming to achieve enhanced photocatalytic activity and stability toward the generation of H2 from water, we have synthesized noble metal-free core-shell nanoparticles of graphene (G)-wrapped CdS and TiO2 ([email protected]@TiO2) by a facile hydrothermal method. The interlayer thickness of G between the CdS core and TiO2 shell is optimized by varying the amount of graphene quantum dots (GQD) during the synthesis procedure. The most optimized sample, i.e., [email protected]@TiO2 generated 1510 µmole g−1 h−1 of H2 (apparent quantum efficiency (AQE) = 5.78%) from water under simulated solar light with air mass 1.5 global (AM 1.5G) condition which is ~2.7 times and ~2.2 time superior to pure TiO2 and pure CdS respectively, along with a stable generation of H2 during 40 h of continuous operation. The increased photocatalytic activity and stability of the [email protected]@TiO2 sample are attributed to the enhanced visible light absorption and efficient charge separation and transfer between the CdS and TiO2 due to incorporation of graphene between the CdS core and TiO2 shell, which was also confirmed by UV-vis, photoelectrochemical and valence band XPS measurements. View Full-Text
Keywords: core-shell nanoparticles; [email protected]@TiO2; photocatalytic H2 generation; solar spectrum active; heterojunction; hydrothermal core-shell nanoparticles; [email protected]@TiO2; photocatalytic H2 generation; solar spectrum active; heterojunction; hydrothermal
Show Figures

Graphical abstract

MDPI and ACS Style

Zubair, M.; Svenum, I.-H.; Rønning, M.; Yang, J. Core-Shell Nanostructures of Graphene-Wrapped CdS Nanoparticles and TiO2 ([email protected]@TiO2): The Role of Graphene in Enhanced Photocatalytic H2 Generation. Catalysts 2020, 10, 358. https://doi.org/10.3390/catal10040358

AMA Style

Zubair M, Svenum I-H, Rønning M, Yang J. Core-Shell Nanostructures of Graphene-Wrapped CdS Nanoparticles and TiO2 ([email protected]@TiO2): The Role of Graphene in Enhanced Photocatalytic H2 Generation. Catalysts. 2020; 10(4):358. https://doi.org/10.3390/catal10040358

Chicago/Turabian Style

Zubair, Muhammad, Ingeborg-Helene Svenum, Magnus Rønning, and Jia Yang. 2020. "Core-Shell Nanostructures of Graphene-Wrapped CdS Nanoparticles and TiO2 ([email protected]@TiO2): The Role of Graphene in Enhanced Photocatalytic H2 Generation" Catalysts 10, no. 4: 358. https://doi.org/10.3390/catal10040358

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop