Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 244, Issue -, Pages 641-649Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2018.11.089
Keywords
BiVO4 quantum dots; r-TiO2 nanorod arrays; Energetic charge carrier transfer; Surface plasmonic response; CO2 conversion
Funding
- National Natural Science Foundation of China [21607066, U1401245, 91622119]
- Fundamental Research Funds for the Central Universities [lzujbky-2018-142, lzujbky-2018-it84]
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It is highly desired to develop efficient visible-light-driven BiVO4-based nano-photocatalysts with recyclable feature by modulating photogenerated electrons and extending visible-light responses. Herein, a novel nano composite array has been successfully fabricated by uniformly decorating BiVO4 quantum dot (BiVO4-QD) with an average size of similar to 5 nm onto rutile-TiO2 nanorod array (RTA) through the successive ionic layer adsorption and reaction processes, and exhibited high photocatalytic activity for converting CO2 to CO and CH4 under visible-light irradiation. The exceptional photoactivity is mainly attributed to the greatly-enhanced charge separation and prolonged charge lifetime by effectively transferring photogenerated electrons at the elevated conduction band bottom of BiVO4 to rutile-TiO2 nanorods as favorable electron acceptors and transport mediums by means of surface photovoltage technique, Mott-Schottky analyses and EIS measurements. Moreover, the photoactivity of optimized BiVO4-QD/RTA nanocomposite is further improved after loading SPR Au nanoparticles by promoting charge separation and extending visible-light responses, about 6.5-time higher than that of BiVO4-QD decorated anatase nanoparticle film. This work provides a feasible strategy to prepare easily reused and efficient BiVO4-based photocatalyst, which is also applicable to other semiconductors with low CB.
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