MoO3/g-C3N4 Z-scheme (S-scheme) system derived from MoS2/melamine dual precursors for enhanced photocatalytic H2 evolution driven by visible light. (11th January 2021)

• Record Type: Journal Article
• Authors: Shi, Jinwen; Zheng, Botong; Mao, Liuhao; Cheng, Cheng; Hu, Yuchao; Wang, Heng; Li, Gaosheng; Jing, Dengwei; Liang, Xianglong
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 3(2021)
• Page Start: 2927
• Page End: 2935
• Publication Date: 2021-01-11
• Subjects: Molybdenum trioxide -- Molybdenum disulfide -- Graphitic carbon nitride -- Hydrogen -- One-pot method; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.04.216
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: A dual-precursors co-pyrolysis strategy was adopted to prepare photocatalysts of MoO3 /g-C3 N4 composite from MoS2 /melamine through a facile one-pot method. By following this strategy, MoS2 was in-situ transformed to MoO3 accompanying with the pyrolysis and polymerization of melamine to g-C3 N4 nanosheets. A set of samples about MoO3 /g-C3 N4 composite containing different MoO3 contents were prepared and the visible-light driven photocatalytic performance of samples were investigated. The photocatalytic activity was notably enhanced and the highest evolution rate for H2 reached 13.9 times and 2.5 times that of the pristine g-C3 N4 and the MoO3 /g-C3 N4 derived from MoO3 /melamine, respectively. On the one hand, layered MoS2 used as the precursor of MoO3 contributed to the intimate contact with g-C3 N4 nanosheets and the high dispersity of derived MoO3, and on the other hand, the morphology and electronic structure of g-C3 N4 were actually changed by the strong interaction between the MoO3 and g-C3 N4, thus inducing an efficient Z-scheme (S-scheme) system in the composite. The above-mentioned co-operation effect in the composite resulted in the significant improvement on the activity of photocatalytic H2 evolution. This work presented a valuable reference, by taking MoO3 /g-C3 N4 as an example, for the construction of composite-photocatalyst system in visible-light-driven H2 evolution. Graphical abstract: Image 1 Highlights: MoO3 /g-C3 N4 photocatalyst was prepared by one-pot pyrolysis of MoS2 /melamine. H2 -evolution rate was higher than those of g-C3 N4 and sample from MoO3 /melamine. Layered MoS2 contributed to well dispersity and contact of derived MoO3 on g-C3 N4 . Dual-precursors in-situ transformation process influenced the structure of g-C3 N4 . Interaction between MoO3 and g-C3 N4 was enhanced to form efficient Z-scheme system.