Journal
LANGMUIR
Volume 37, Issue 14, Pages 4236-4247Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.1c00210
Keywords
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Funding
- National Natural Science Foundation of China [51772130, 51972145]
- Independent Innovation Team from Ji Nan Science & Technology Bureau [2019GXRC016]
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A novel metal-free all-solid-state z-scheme g-C3N4/NCDs/WOx photocatalyst with enhanced visible and NIR light photocatalytic activity was fabricated using nitrogen-doped carbon dots (NCDs) as the electron mediator. The hydrogen evolution rate significantly increased under visible light irradiation, and the apparent quantum efficiency reached 7.58% at 420 nm. The utilization efficiency of NIR light was improved by the localized surface plasmon resonance effect of WOx and the up-converted photoluminescence property of NCDs.
A novel metal-free all-solid-state z-scheme g-C3N4/NCDs/WOx photocatalyst was fabricated using nitrogen-doped carbon dots (NCDs) as the electron mediator. As-prepared sandwich-structured composites displayed enhanced visible and NIR light photocatalytic activity. Under visible light irradiation, the hydrogen evolution rate reached 3.27 mmol g(-1) h(-1), which increased to roughly seven times higher than that of pure g-C3N4 and roughly twice that of g-C3N4/NCDs or g-C3N4/WOx binary heterojunctions. The apparent quantum efficiency is 7.58% at 420 nm. The localized surface plasmon resonance effect of WOx and the up-converted photoluminescence property of NCDs enhanced the utilization efficiency of NIR light together. In addition, the matched energy band structures of WOx and g-C3N4 as well as the effective electron conductor (NCDs) between them accelerate electron transfer at the interface. The all-solid-state z-scheme g-C3N4/NCDs/WOx photocatlyst was confirmed by a series of characterizations and experiment results. This report offered new insights into constructing an efficient all-solid-state z-scheme photocatalyst to be applied during the photocatalytic water-splitting reaction in the visible and NIR light regions.
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