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http://hdl.handle.net/10397/88122
Title: | A ternary dumbbell structure with spatially separated catalytic sites for photocatalytic overall water splitting | Authors: | Qiu, BC Cai, LJ Zhang, N Tao, XM Chai, Y |
Issue Date: | 9-Sep-2020 | Source: | Advanced science, 9 Sept. 2020, v. 7, no. 17, p. 1-18 | Abstract: | Solar-driven overall water splitting based on metal sulfide semiconductor photocatalysts remains as a challenge owing to the strong charge recombination and deficient catalytic active sites. Additionally, significant inhibition of back reactions, especially the oxidation of sulfide ions during the photocatalytic water oxidation catalysis, is an arduous task that requires an efficient photogenerated hole transfer dynamics. Here, a ternary dumbbell-shaped catalyst based on RuO2/CdS/MoS(2)with spatially separated catalytic sites is developed to achieve simultaneous production of hydrogen and oxygen under simulated solar-light without any sacrificial agents. Particularly, MoS(2)nanosheets anchored on the two ends of CdS nanowires are identified as a reduction cocatalyst to accelerate hydrogen evolution, while RuO(2)nanoparticles as an oxidation cocatalyst are deposited onto the sidewalls of CdS nanowires to facilitate oxygen evolution kinetics. The density functional theory simulations and ultrafast spectroscopic results reveal that photogenerated electrons and holes directionally migrate to MoS(2)and RuO(2)catalytic sites, respectively, thus achieving efficient charge carrier separation. The design of ternary dumbbell structure guarantees metal sulfides against photocorrosion and thus extends their range in solar water splitting. | Keywords: | Charge transfer Dual cocatalysts Nanodumbbells Overall water splitting Spatially separated sites |
Publisher: | Wiley-VCH | Journal: | Advanced science | ISSN: | 2198-3844 | DOI: | 10.1002/advs.201903568 | Rights: | © 2020 The Hong Kong Polytechnic University. Published by WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim This is an open access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited. The following publication Qiu, B. C., Cai, L. J., Zhang, N, Tao, X. M., & Chai, Y. (2020). A ternary dumbbell structure with spatially separated catalytic sites for photocatalytic overall water splitting. Advanced Science, 7(17), 1-18 is available at https://dx.doi.org/10.1002/advs.201903568 |
Appears in Collections: | Journal/Magazine Article |
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Qiu_Ternary_Dumbbell_Structure.pdf | 3.3 MB | Adobe PDF | View/Open |
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