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Title: Improving photoelectrochemical activity of ZnO/TiO₂ core–shell nanostructure through Ag nanoparticle integration
Authors: Wang, Zeli
Chen, Zhen
Dan, Jiadong
Chen, Weiqiang
Zhou, Chenghang
Shen, Zexiang
Sum, Tze Chien
Wang, Xue-Sen
Keywords: Science::Physics
Issue Date: 2021
Source: Wang, Z., Chen, Z., Dan, J., Chen, W., Zhou, C., Shen, Z., Sum, T. C. & Wang, X. (2021). Improving photoelectrochemical activity of ZnO/TiO₂ core–shell nanostructure through Ag nanoparticle integration. Catalysts, 11(8), 911-.
Project: R-144-000-365-112
Journal: Catalysts
Abstract: In solar energy harvesting using solar cells and photocatalysts, the photoexcitation of electrons and holes in semiconductors is the first major step in the solar energy conversion. The lifetime of carriers, a key factor determining the energy conversion and photocatalysis efficiency, is shortened mainly by the recombination of photoexcited carriers. We prepared and tested a series of ZnO/TiO₂-based heterostructures in search of designs which can extend the carrier lifetime. Time-resolved pho-toluminescence tests revealed that, in ZnO/TiO₂ core–shell structure the carrier lifetime is extended by over 20 times comparing with the pure ZnO nanorods. The performance improved further when Ag nanoparticles were integrated at the ZnO/TiO₂ interface to construct a Z-scheme structure. We utilized these samples as photoanodes in a photoelectrochemical (PEC) cell and analyzed their solar water splitting performances. Our data showed that these modifications significantly enhanced the PEC per-formance. Especially, under visible light, the Z-scheme structure generated a photocurrent density 100 times higher than from the original ZnO samples. These results reveal the potential of ZnO-Ag-TiO₂ nanorod arrays as a long-carrier-lifetime structure for future solar energy harvesting applications.
ISSN: 2073-4344
DOI: 10.3390/catal11080911
Rights: © 2021 The Author(s). Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// 4.0/).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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