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Rationally designed plasmonic hybrid coupling structure of Ag/rGO-ZnO for enhanced photocatalytic CO2 reduction.
- Source :
-
Journal of Alloys & Compounds . Dec2021, Vol. 887, pN.PAG-N.PAG. 1p. - Publication Year :
- 2021
-
Abstract
- • A hybrid Ag/rGO-ZnO photocatalyst settles limitations of poor photoresponse range and high charge recombination of ZnO. • The rationality of Ag/rGO-ZnO nanostructure is confirmed by PEC characterization and FDTD simulation. • Ag/rGO-ZnO shows enhanced CO 2 reduction activity and stability. [Display omitted] In this work, a plasmonic hybrid coupling-enhanced photocatalyst of Ag/rGO (reduced graphene oxide)-ZnO, integrating superior activity, lasting stability, and low cost all-in-one, is proposed to settle limitations related to narrow photoresponse range and high charge recombination on ZnO. Graphene oxide nanoflakes were successfully composited with ZnO nanorods using the self-assembly method, then modified with Ag nanoparticles. UV–vis absorption spectra, photoelectrochemical characterizations and the finite difference time domain simulations show that this nanocomposite has enhanced catalytic activity for reducing CO 2 to CO and CH 4 compared to pure ZnO (P-ZnO). By tuning the content of graphene and Ag, the maximum photocatalytic efficiency of Ag/rGO-ZnO (62.7 μmol g−1 h−1) far exceeds that of P-ZnO by at least 28 times, with high stability for more than 24 h in the absence of hole scavengers and photosensitizers. Meanwhile, with the addition of Ag and graphene, Ag/rGO-ZnO exhibits a selective tendency toward the cleaner fuel-CH 4 , which is 7 times higher than P-ZnO. Our study highlights the potential of broadening the light response range, suppressing e−/h+ recombination, and improving the stability of catalysts based on a nanocomposite structure. It also provides a more valuable reference for promoting low-cost commercial applications of ZnO photocatalysts. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 887
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 152846920
- Full Text :
- https://doi.org/10.1016/j.jallcom.2021.161457