Engineering S-scheme Bi2WO6/CoAl-LDH heterostructure for enhancing photocatalytic redox ability
Source abstract
Abstract
Constructing heterostructures to restrain the rapid recombination of photogenerated e −- h + pairs is believed to be an effective strategy to improve photocatalytic redox efficiency, but the inferior contact interface and low charge transfer efficiency still restrict the heterostructures applications. Herein, for improving the photocatalytic efficiency in the Cr(VI) reduction and MB degradation under visible-light, tiny Bi 2WO 6 (BWO) nanosheets were confined on the CoAl-LDH (LDH) surface to construct the BWO/LDH S-scheme heterostructure with strong internal electric field due to spatial confinement effect. The incorporation of BWO broadened the photo-absorption range and effectively promoted the separation of photo-generated charges, leading to the dramatical enhancement in photocatalytic redox activity of the LDH. Experimental results and theoretical calculations showed that the internal electric field endowed a powerful driving force for vectoral migration of charge carriers between BWO and LDH, and thus promoted the transfer and spatial separation of charge carriers through S-scheme pathway. Benefitted from the S-scheme heterostructures, the perfect BWO/LDH 2.0 delivered a high removal efficiencies of 85.1 % in Cr(VI) reaction and 92.1 % in MB degradation, which reaction rates were 2.0 and 1.5 times higher than those of the LDH under visible-light, respectively. This work suggested a feasible approach to construct LDH-based photocatalysts with S-scheme heterostructures.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced Photocatalysis Techniques · Gas Sensing Nanomaterials and Sensors · Covalent Organic Framework Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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