Triphasic 2D Materials by Vertically Stacking Laterally Heterostructured 2H-/1T'-MoS2 on Graphene for Enhanced Photoresponse
Abstract
Recently the applications of two-dimensional (2D) materials have been broadened by engineering their mechanical, electronic, and optical properties through either lateral or vertical hybridization. Along with this line, we report the successful design and fabrication of a novel triphasic 2D material by vertically stacking lateral 2H-/1T'-molybdenum disulfide (MoS2) heterostructures on graphene with the assistance of supercritical carbon dioxide. This triphasic structure is experimentally shown to significantly enhance the photocurrent densities for hydrogen evolution reactions. First-principles theoretical analyses reveal that the improved photoresponse should be ascribed to the beneficial band alignments of the triphasic heterostructure. More specifically, electrons can efficiently hop to the 1T'-MoS2 phase via the highly conductive graphene layer as a result of their strong vertical interfacial electronic coupling. Subsequently, the electrons acquired on the 1T'-MoS2 phase are exploited to fill the photoholes on the photo-excited 2H-MoS2 phase through the lateral heterojunction structure, thereby suppressing the recombination process of the photo-induced charge carriers on the 2H-MoS2 phase. This novel triphasic concept promises to open a new avenue to widen the molecular design of 2D hybrid materials for photonics-based energy conversion applications.
- Authors:
-
[5]
- Zhengzhou Univ. (China). College of Materials Science and Engineering
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS) and Computational Sciences and Engineering Division
- Shaanxi Normal Univ., Xi'an City (China). Key Lab. for Macromolecular Science of Shaanxi Province School of Chemistry and Chemical Engineering
- Griffith Univ., QLD (Australia). Griffith School of Environment, Centre for Clean Environment and Energy; Chinese Academy of Sciences (CAS), Hefei (China). Inst. of Solid State Physics, Centre for Environmental and Energy Nanomaterials
- Griffith Univ., QLD (Australia). Griffith School of Environment, Centre for Clean Environment and Energy
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Sponsoring Org.:
- USDOE Office of Science (SC); Australian Research Council (ARC); National Natural Science Foundation of China (NSFC)
- OSTI Identifier:
- 1356943
- Grant/Contract Number:
- AC05-00OR22725; 51173170; 21101141
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Advanced Electronic Materials
- Additional Journal Information:
- Journal Volume: 3; Journal ID: ISSN 2199-160X
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; triphasic two-dimensional heterostructures; lateral heterojunction; vertical stacking; photoresponses; hydrogen evolution reactions
Citation Formats
Cui, Weili, Xu, Shanshan S., Yan, Bo, Guo, Zhihua H., Xu, Qun, Sumpter, Bobby G., Huang, Jingsong S., Yin, Shiwei W., Zhao, Huijun J., and Wang, Yun. Triphasic 2D Materials by Vertically Stacking Laterally Heterostructured 2H-/1T'-MoS2 on Graphene for Enhanced Photoresponse. United States: N. p., 2017.
Web. doi:10.1002/aelm.201700024.
Cui, Weili, Xu, Shanshan S., Yan, Bo, Guo, Zhihua H., Xu, Qun, Sumpter, Bobby G., Huang, Jingsong S., Yin, Shiwei W., Zhao, Huijun J., & Wang, Yun. Triphasic 2D Materials by Vertically Stacking Laterally Heterostructured 2H-/1T'-MoS2 on Graphene for Enhanced Photoresponse. United States. https://doi.org/10.1002/aelm.201700024
Cui, Weili, Xu, Shanshan S., Yan, Bo, Guo, Zhihua H., Xu, Qun, Sumpter, Bobby G., Huang, Jingsong S., Yin, Shiwei W., Zhao, Huijun J., and Wang, Yun. Thu .
"Triphasic 2D Materials by Vertically Stacking Laterally Heterostructured 2H-/1T'-MoS2 on Graphene for Enhanced Photoresponse". United States. https://doi.org/10.1002/aelm.201700024. https://www.osti.gov/servlets/purl/1356943.
@article{osti_1356943,
title = {Triphasic 2D Materials by Vertically Stacking Laterally Heterostructured 2H-/1T'-MoS2 on Graphene for Enhanced Photoresponse},
author = {Cui, Weili and Xu, Shanshan S. and Yan, Bo and Guo, Zhihua H. and Xu, Qun and Sumpter, Bobby G. and Huang, Jingsong S. and Yin, Shiwei W. and Zhao, Huijun J. and Wang, Yun},
abstractNote = {Recently the applications of two-dimensional (2D) materials have been broadened by engineering their mechanical, electronic, and optical properties through either lateral or vertical hybridization. Along with this line, we report the successful design and fabrication of a novel triphasic 2D material by vertically stacking lateral 2H-/1T'-molybdenum disulfide (MoS2) heterostructures on graphene with the assistance of supercritical carbon dioxide. This triphasic structure is experimentally shown to significantly enhance the photocurrent densities for hydrogen evolution reactions. First-principles theoretical analyses reveal that the improved photoresponse should be ascribed to the beneficial band alignments of the triphasic heterostructure. More specifically, electrons can efficiently hop to the 1T'-MoS2 phase via the highly conductive graphene layer as a result of their strong vertical interfacial electronic coupling. Subsequently, the electrons acquired on the 1T'-MoS2 phase are exploited to fill the photoholes on the photo-excited 2H-MoS2 phase through the lateral heterojunction structure, thereby suppressing the recombination process of the photo-induced charge carriers on the 2H-MoS2 phase. This novel triphasic concept promises to open a new avenue to widen the molecular design of 2D hybrid materials for photonics-based energy conversion applications.},
doi = {10.1002/aelm.201700024},
journal = {Advanced Electronic Materials},
number = ,
volume = 3,
place = {United States},
year = {Thu May 11 00:00:00 EDT 2017},
month = {Thu May 11 00:00:00 EDT 2017}
}
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