Journal
ADVANCED MATERIALS
Volume 34, Issue 14, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202109330
Keywords
CH; (4) production; CO; (2) photoreduction; dual-hetero-active-sites; metal; nonmetal plasmon coupling; plasmonic hot spots
Categories
Funding
- National Natural Science Foundation of China [12074055, 51772041]
- Liaoning BaiQianWan Talents Program
- Dalian Science Foundation for Distinguished Young Scholars [2018RJ05]
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This research proposes a plasmonic active hot spot-confined photocatalysis technology to achieve efficient and selective CO2 reduction by forming active hot spots in the Au/TiO2/W18O49 heterostructure, resulting in the production of abundant CH4 and CO.
Plasmonic nanostructures have tremendous potential to be applied in photocatalytic CO2 reduction, since their localized surface plasmon resonance can collect low-energy-photons to derive energetic hot electrons for reducing the CO2 activation-barrier. However, the hot electron-driven CO2 reduction is usually limited by poor efficiency and low selectivity for producing kinetically unfavorable hydrocarbons. Here, a new idea of plasmonic active hot spot-confined photocatalysis is proposed to overcome this drawback. W18O49 nanowires on the outer surface of Au nanoparticles-embedded TiO2 electrospun nanofibers are assembled to obtain lots of Au/TiO2/W18O49 sandwich-like substructures in the formed plasmonic heterostructure. The short distance (< 10 nm) between Au and adjacent W18O49 can induce an intense plasmon-coupling to form the active hot spots in the substructures. These active hot spots are capable of not only gathering the incident light to enhance hot electrons generation and migration, but also capturing protons and CO through the dual-hetero-active-sites (Au-O-Ti and W-O-Ti) at the Au/TiO2/W18O49 interface, as evidenced by systematic experiments and simulation analyses. Thus, during photocatalytic CO2 reduction at 43 +/- 2 degrees C, these active hot spots enriched in the well-designed Au/TiO2/W18O49 plasmonic heterostructure can synergistically confine the hot-electron, proton, and CO intermediates for resulting in the CH4 and CO production-rates at approximate to 35.55 and approximate to 2.57 mu mol g(-1) h(-1), respectively, and the CH4-product selectivity at approximate to 93.3%.
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