Plasmonic Au nanoparticles incorporated in zeolitic imidazolate framework (ZIF-67) for efficient sunlight-driven photoreduction of CO2
2020
Nowadays, charge
separation and efficient solar-light absorption are the main challenges
in the photoreduction of CO2. Although significant efforts
have been made to overcome these issues, including the use of cocatalysts
and doping, photocatalysts still suffer from low photocatalytic activity
and stability. Herein, the localized surface plasmonic resonance (LSPR)
effect of Au nanoparticles deposited into the zeolitic imidazolate
framework (ZIF-67) was investigated for the photoreduction of CO2. Different Au loadings in ZIF were prepared and their effects
were studied on photocatalytic performance. Plasmonic Au nanoparticles
(PNPs) in the size range of 30–40 nm improved visible-light
absorption, enhanced charge separation, and played an important role
in selectivity. A volcano relationship of plasmonic Au NPs with methanol
and ethanol generation was found, along with the deposition of plasmonic
Au nanoparticles. A total yield of 2.5 mmol g–1 h–1 of methanol and 0.5 mmol g–1 h–1 of ethanol were obtained, which are the highest values
compared to those reported in other studies. Finally, our results
revealed that Au PNPs have a significant impact on the selectivity
and photocatalytic activity of ZIF-67 for the photoreduction of CO2 and could be a promising alternative toward designing plasmonic
reticular materials.
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