Efficient interfacial charge separation in graphene quantum dots/tin disulfide hybrids for improved photoelectrochemical performance

Due to their distinctive layered structure, two-dimensional materials facilitate the arrival of photogenerated charges on their surfaces, making them potential candidates for photoelectric catalysis research. In this study, OH-GQDs/SnS 2 composites were effectively fabricated through a simple hydrot...

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Bibliographic Details
Published in:Ionics 2024-09, Vol.30 (9), p.5611-5621
Main Authors: Liu, Qianying, Hua, Haiji, Wei, Wei, Huang, Xiaoyu, Yang, Jian, Lu, Qingchen, Lu, Huidan, Liu, Yongping
Format: Article
Language:English
Subjects:
Catalysis
Charge materials
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Dyes
Electrochemistry
Electrons
Energy Storage
Graphene
Heterojunctions
Optical and Electronic Materials
Performance evaluation
Photocatalysis
Photodegradation
Photoelectric effect
Photoelectricity
Quantum dots
Renewable and Green Energy
Separation
Tin disulfide
Two dimensional materials
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Summary:Due to their distinctive layered structure, two-dimensional materials facilitate the arrival of photogenerated charges on their surfaces, making them potential candidates for photoelectric catalysis research. In this study, OH-GQDs/SnS 2 composites were effectively fabricated through a simple hydrothermal method. The samples were meticulously analyzed, revealing their morphology, intricate structure, and composition. Additionally, the photoelectrocatalytic performance of the heterojunction was meticulously evaluated. The results demonstrate that OH-GQDs intimately attach to the surface of SnS 2 ultrathin nanosheets, signaling robust interfacial interactions. With the integration of OH-GQDs, the composite exhibits enhanced absorption of visible light, leading to a remarkable improvement in photocatalytic degradation efficiency towards methyl orange, as well as superior photoelectrochemical activity. The heterojunction generates a photocurrent at 0.6V (vs. Ag/AgCl) that is tenfold higher compared to pure SnS 2 . By means of Kelvin probe force microscopy (KPFM), an extensive analysis was carried out to scrutinize the surface potential of the OH-GQDs/SnS 2 composite. At the junction, it was noticed that photogenerated electrons migrated from SnS 2 to OH-GQDs, thereby considerably improving the efficiency of electron–hole pair separation. Consequently, this facilitated the improved performance of photocatalysis and photoelectric catalysis. These findings provide important references and effective ways to design efficient graphene quantum-dot photocatalysts. Graphical Abstract
ISSN:0947-7047
1862-0760
DOI:10.1007/s11581-024-05647-6