期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 252, 期 -, 页码 164-173出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2019.04.035
关键词
Plasmonic coupling; Photo/thermal catalytsis; H-2 evolution; W18O49 nanowires; Ag nanorices
资金
- National Natural Science Foundation of China [51772041, 11474046, 61775024, 11704058, 21503034]
- Natural Science Foundation of Liaoning Province [20170540190]
- Program for Liaoning Excellent Talents in University (LNET) [LR2015016, LR2017004]
- Program for Dalian Excellent Talents [2016RQ069]
- Science and Technique Foundation of Dalian [2014J11JH134, 2015J12JH201]
- Dalian Science Foundation for Distinguished Young Scholars (2018)
- LiaoNing Revitalization Talents Program [XLYC1807176]
- [DUT16RC(3)111]
Plasmonic coupling between two or more metal nanostructures has attracted significant interest, since this fascinating near-field interaction is more effective for the aggregation/magnification of the incident light intensity compared to normal surface-plasmon-resonance (SPR) of single nanostructures. Herein, we report, for the first time, an IR-driven strong plasmonic coupling in an unusual metal/non-metal heterostructure system. This system is fabricated through random assemblage of Ag nanorices (NRs) onto W18O49 nanowires (NWs) film with F-doped SnO2 glass as substrate. Through the 3D-finite element simulation, we demonstrate that the plasmonic coupling between Ag NRs and W18O49 NWs significantly enhances the localized electric fields at the hot spots. This achieved magnitudes of 10(1)-10(4) times of that of incident light, thus leading to the promoted generation of plasmonic hot-electrons. Moreover, the resonance excitation of plasmonic coupling on the heterostructures not only induces ultrafast electron transfer from W18O49 to Ag hetero-components, but also the photothermal effect to increase the localized temperature. Upon SPR-coupling excitation, the Ag/W18O49 heterostructures film exhibits a remarkable enhancement of the photo/thermal catalytic activity for H-2 evolution from ammonia borane compared to that of either the Ag NRs ((similar to)8.2 x) or W18O49 NWs ((similar to)9.0 x) films. Notably, we observed an obvious H-2 evolution over the Ag/W18O49 heterostructures film under natural sunlight irradiation.
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