Crystallinity and phase controlling of g-C3N4 /CdS hetrostructures towards high efficient photocatalytic H2 generation. (15th November 2019)

• Record Type: Journal Article
• Authors: Wang, Yaya; Zhang, Xiao; Liu, Yingjie; Zhao, Yubin; Xie, Cong; Song, Yuxiang; Yang, Ping
• Is Part Of: International journal of hydrogen energy. Volume 44:Number 57(2019)
• Page Start: 30151
• Page End: 30159
• Publication Date: 2019-11-15
• Subjects: g-C3N4 -- CdS -- Heterostructure -- Photocatalytic H2; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2019.09.181
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The heterostructures of graphitic carbon nitride (g-C3 N4 ) and CdS were synthesized by controlling the crystalline degree of g-C3 N4 and the phase composition of CdS. A thermal polycondensation process of N precursors was adjusted to get amorphous and crystalline g-C3 N4 . A multistep adsorption method was used to deposit CdS nanoparticles on g-C3 N4 . An annealed process was used to adjust the phase composition of CdS from cubic to hexagonal. The morphology of CdS was changed to rod. Amorphous g-C3 N4 /CdS heterostructures revealed enhanced photocatalytic activity because the amorphous g-C3 N4 has a lower crystallinity, it is easier to form a heterojunction with the CdS. Further, an annealing process resulted in the phase transfer and morphology change of CdS. The high stability and rod morphology of CdS make the heterostructures with high H2 generation rate to 5440 μmol h-1 g-1 which is ~5 times high compared with g-C3 N4 . Graphical abstract: g-C3 N4 /CdS hetrojunctions with crystallinity and phase controlling for high efficiency photocatalytic hydrogen generation. Image 1 Highlights: g-C3 N4 with different degrees of crystallinity was used to form a heterojunction with CdS. The phase transition of CdS significantly improved its photocatalytic activity. The heterojunction after the phase transition is greatly different due to difference in matrix.