文献类型：期刊文献

英文题名：Enhancing light and dark photocatalytic hydrogen production via graphene conductive networks in carbon nitride composites

作者：Zhang, Zejun[1];Bu, Fankai[1];Wang, Songmei[1];Wei, Zhidong[3];Zhu, Yong[2];Liu, Junying[1]

机构：[1]Jiangsu Univ, Sch Environm & Safety Engn, 301 Xuefu Rd, Zhenjiang 212013, Peoples R China;[2]East China Univ Sci & Technol, Coll Mech & Power Engn, Shanghai 200237, Peoples R China;[3]Shanghai Jiao Tong Univ, Coll Smart Energy, Shanghai 200030, Peoples R China

年份：2026

外文期刊名：ENERGY ADVANCES

收录：WOS:【ESCI(收录号:WOS:001733807000001)】；

基金：This work was supported by the Jiangsu Distinguished Professor Project (RC20240909) and the Jiangsu University Foundation (no. 22JDG033).

语种：英文

摘要：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.