期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 233, 期 -, 页码 19-25出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2018.03.073
关键词
H-2 production; Photocatalysis; Electrospinning; Plasmonic semiconductor; Carbon fiber
资金
- National Natural Science Foundation of China [51772041, 11474046, 61775024, 21503034]
- Natural Science Foundation of Liaoning Province [20170540190]
- Program for Liaoning Excellent Talents in University (LNET) [LR2015016]
- Program for Dalian Excellent Talents [2016RQ069]
- Science and Technique Foundation of Dalian [2014J11JH134, 2015J12JH201]
Plasmonic nanostructures have received significant attention in the field of solar-to-fuels conversion, because they can collect and utilize abundant low-energy photons to generate high-energy hot electrons for producing green chemical fuels. However, the ultrafast relaxation process of hot electron often leads to poor quantum yields of plasmonic nanostructures. Herein, we construct the one-dimensional W18O49/Carbon heterostructure for employing low-cost electrospun carbon fibers as the electron mediator to hinder the relaxation of hot electron in plasmonic W18O49 nanowires. We confirm that the IR-excited plasmonic hot electrons in W18O49 nanowires can quickly transfer to carbon fibers within only similar to 50 fs in the W18O49/C heterostructure, This kinetics time is much shorter than the relaxation time of these hot electrons from high-energy surface plasmon (SP) to the ground state in W15O49 nanowires (similar to 5.5 ps). As a result, upon low-energy IR-light excitation, the W15O49/C heterostructures exhibit nearly 2-fold enhancement on the catalytic H-2 production from ammonia borane as compared to single W18O49 nanowires. Wavelength-dependent catalytic tests further indicate that this plasmonenhanced catalytic activity is induced by the ultrafast transport process of plasmonic hot electron due to the localized surface plasmon resonance.
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