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First demonstration of rainbow photocatalysts using ternary Cd1-xZnxSe nanorods of varying compositions

Paper ID Volume ID Publish Year Pages File Format Full-Text
39774 45835 2014 8 PDF Available
Title
First demonstration of rainbow photocatalysts using ternary Cd1-xZnxSe nanorods of varying compositions
Abstract

•The concept of rainbow photocatalysts was realized by assembling Cd1-xZnxSe NRs.•A remarkable photoconversion efficiency was observed under white light illumination.•The broadband light absorption of NRs assembly enables full visible light harvesting.•The NRs assembly can be used for efficient solar fuel production.

We demonstrated for the first time that the assembly of Cd1-xZnxSe nanorods (NRs) with five compositions (x = 0, 0.35, 0.54, 0.61, 1) may absorb the whole visible spectrum in a gradient fashion for photoconversion applications. The samples were prepared by conducting cation exchange reactions on Ag2Se NRs with excess Cd2+ and Zn2+ ions. By modulating the molar ratio of Cd2+ to Zn2+ employed, the composition of the resulting Cd1-xZnxSe NRs can be delicately controlled. Because of the tunability of band edge with stoichiometry, Cd1-xZnxSe NRs of varying compositions absorbed light at different wavelength regions, which spanned almost the entire visible spectrum. As compared to the individual constituent NRs, the NRs assembly exhibited greatly improved photoactivity in photoelectrochemical water splitting as well as superior photocatalytic performance toward methylene blue degradation under white light illumination. This superiority emanates from the composition-gradient configuration that significantly improves the light harvesting efficiency by absorbing almost the whole visible spectrum of the incident white light. The full visible photon harvesting of the NRs assembly was validated by the photocurrent action spectrum which showed spectral accordance with the absorption spectrum. The recycling test manifests that the NRs assembly displayed substantially high stability during its use as photocatalyst. Furthermore, the result of performance evaluation under natural sunlight reveals that the present NRs assembly can be used as practical rainbow photocatalysts which may effectively harvest energy from sunlight. The demonstration from this work may facilitate the use of sophisticated assembly of semiconductor nanocrystals in relevant photoconversion processes where the effectiveness of photon harvesting is determinant.

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Keywords
Rainbow photocatalysts; Solar fuel production; Cd1-xZnxSe; Cation exchange
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First demonstration of rainbow photocatalysts using ternary Cd1-xZnxSe nanorods of varying compositions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 476, 22 April 2014, Pages 140–147
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us