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Enhancing light and dark photocatalytic hydrogen production via graphene conductive networks in carbon nitride composites
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DOI：10.1039/d6ya00031b.png)
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Abstract
En 中文
The development of photocatalysts capable of operating under both light and dark conditions is critical for sustainable solar energy utilization. This study presents a graphene-enhanced cyano-functionalized carbon nitride composite, fabricated via a simple electrostatic assembly method, to achieve efficient photocatalytic hydrogen evolution during day-night cycles. The introduction of graphene does not alter the structure of NCNCN. Graphene functions as an electron-conductive network, significantly improving charge separation and storage capabilities. Under visible light (lambda >= 400 nm), the optimal composite with 0.5 wt% graphene exhibited a hydrogen production rate of 3156 & micro;mol h-1 g-1, 35% higher than that of pure NCNCN. Remarkably, under dark conditions, it achieved a hydrogen yield of 3.8 & micro;mol, representing a 65% enhancement. Photoelectrochemical analyses validated the reduced recombination of electron-hole pairs and enhanced conductivity. The proposed mechanism highlights the role of graphene in facilitating electron transfer to Pt co-catalysts and storing electrons via cyanide-K+ pairs for delayed hydrogen production in the dark. This work demonstrates the potential of graphene-based composites as efficient all-weather photocatalysts for sustainable energy applications.
Keywords:
QUANTUM DOTS
WATER
PERFORMANCE
EFFICIENCY
G-C3N4
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4.3
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566
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