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|Title:||Improving photoelectrochemical activity of ZnO/TiO₂ core–shell nanostructure through Ag nanoparticle integration||Authors:||Wang, Zeli
Sum, Tze Chien
|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-. https://dx.doi.org/10.3390/catal11080911||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.||URI:||https://hdl.handle.net/10356/153834||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:// creativecommons.org/licenses/by/ 4.0/).||Fulltext Permission:||open||Fulltext Availability:||With Fulltext|
|Appears in Collections:||SPMS Journal Articles|
Updated on May 19, 2022
Updated on May 19, 2022
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