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Issue 7, 2020
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Multi-interfacial plasmon coupling in multigap (Au/AgAu)@CdS core–shell hybrids for efficient photocatalytic hydrogen generation

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Abstract

Plasmon coupling induced intense light absorption and near-field enhancement have vast potential for high-efficiency photocatalytic applications. Herein, (Au/AgAu)@CdS core–shell hybrids with strong multi-interfacial plasmon coupling were prepared through a convenient strategy for efficient photocatalytic hydrogen generation. Bimetallic Au/AgAu cores with an adjustable number of nanogaps (from one to four) were primarily synthesized by well-controlled multi-cycle galvanic replacement and overgrowth processes. Extinction tests and numerical simulations synergistically revealed that the multigap Au/AgAu hybrids possess a gap-dependent light absorption region and a local electric field owing to the multigap-induced multi-interfacial plasmon coupling. With these characteristics, hetero-photocatalysts prepared by further coating of CdS shells on multigap Au/AgAu cores exhibited a prominent gap-dependent photocatalytic hydrogen production activity from water splitting under light irradiation (λ > 420 nm). It is found that the hydrogen generation rates of multigap (Au/AgAu)@CdS have an exponential improvement compared with that of pure CdS as the number of nanogaps increases. In particular, four-gap (Au/AgAu)@CdS core–shell catalysts displayed the highest hydrogen generation rate, that is 96.1 and 47.2 times those of pure CdS and gapless Au@CdS core–shell hybrids. These improvements can be ascribed to the strong plasmon absorption and near-field enhancement induced by the multi-interfacial plasmon coupling, which can greatly improve the light-harvesting efficiency, offer more plasmonic energy, and boost the generation and separation of electron–hole pairs in the multigap catalysts.

Graphical abstract: Multi-interfacial plasmon coupling in multigap (Au/AgAu)@CdS core–shell hybrids for efficient photocatalytic hydrogen generation

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Supplementary files

Article information


Submitted
13 Nov 2019
Accepted
09 Jan 2020
First published
11 Jan 2020

Nanoscale, 2020,12, 4383-4392
Article type
Paper

Multi-interfacial plasmon coupling in multigap (Au/AgAu)@CdS core–shell hybrids for efficient photocatalytic hydrogen generation

L. Ma, Y. Chen, D. Yang, H. Li, S. Ding, L. Xiong, P. Qin and X. Chen, Nanoscale, 2020, 12, 4383
DOI: 10.1039/C9NR09696E

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