Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 188, Issue -, Pages 245-252Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2016.01.074
Keywords
Electrospinning; Surface plasmon resonance; Silver nanoparticles; Flexible catalyst; Catalytic reduction
Funding
- National Natural Science Foundation of China [51402038, 11474046, 11274057]
- Program for New Century Excellent Talents in University [NCET-13-0702]
- Technology Foundation for Selected Overseas Chinese Scholar from Ministry of Personnel of China,
- Scientific Research Foundation for Doctor of Liaoning Province [20141118]
- Educational Committee Foundation of Liaoning Province [L2014547]
- Science and Technology Project of Liaoning Province [2012222009]
- Program for Liaoning Excellent Talents in University (LNET) [LR2015016]
- Science and Technique Foundation of Dalian [2014J11JH134, 2015112114201]
- Fundamental Research Funds for the Central Universities [DC201502080203, DC201502080304]
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Direct evidence of plasmon-enhanced 4-nitrophenol (4-NP) reduction is observed in a photo-assisted catalytic process with the NaBH4 as the electron donator by using the Ag nanoparticles (AgNPs) supported onto a flexible and processable polyacrylonitrile (PAN) microfibrous network. The Ag/PAN composite fibrous networks exhibit certain activity for 4-NP reduction in general condition. Significantly, when the beam irradiation is introduced to excite the surface plasmon resonance (SPR) of AgNPs, we observed an enhanced catalytic activity for 4-NP reduction (1 similar to 3 times). Meanwhile, the enhancement factors for the catalytic kinetic constants are directly correlated with the SPR absorption spectra of AgNPs. Further in-depth studies by adjusting the experiment conditions reveal that the SPR-induced ultrafast thermal effect of AgNPs is responsible for the enhanced catalytic activity that can not be nevertheless initiated or magnified by the hot plasmonic electrons from Ag. By combining with the theoretical analyses, we propose that this plasmon enhancement is ascribed to the promoted diffusion rate of reactants in the solution driven by increasing the local temperature around the AgNPs on the basis of SPR-enhanced electric field. Our present work provides a new sight to understand the plasmonic enhancement of metal related catalytic reactions, and would also create more opportunities to guide the design and fabrication of high-performance plasmonic catalysts with excellent recycling property. (C) 2016 Elsevier B.V. All rights reserved.
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