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Title: Thermionic Energy Conversion Based on Graphene van der Waals Heterostructures
Authors: Liang, Shi-Jun
Liu, Bo
Hu, Wei
Zhou, Kun
Ang, L. K.
Keywords: Condensed-matter physics
Devices for energy harvesting
Issue Date: 2017
Source: Liang, S.-J., Liu, B., Hu, W., Zhou, K., & Ang, L. K. (2017). Thermionic Energy Conversion Based on Graphene van der Waals Heterostructures. Scientific Reports, 7, 46211-.
Series/Report no.: Scientific Reports
Abstract: Seeking for thermoelectric (TE) materials with high figure of merit (or ZT), which can directly converts low-grade wasted heat (400 to 500 K) into electricity, has been a big challenge. Inspired by the concept of multilayer thermionic devices, we propose and design a solid-state thermionic devices (as a power generator or a refrigerator) in using van der Waals (vdW) heterostructure sandwiched between two graphene electrodes, to achieve high energy conversion efficiency in the temperature range of 400 to 500 K. The vdW heterostructure is composed of suitable multiple layers of transition metal dichalcogenides (TMDs), such as MoS2, MoSe2, WS2 and WSe2. From our calculations, WSe2 and MoSe2 are identified as two ideal TMDs (using the reported experimental material’s properties), which can harvest waste heat at 400 K with efficiencies about 7% to 8%. To our best knowledge, this design is the first in combining the advantages of graphene electrodes and TMDs to function as a thermionic-based device.
ISSN: 2045-2322
DOI: 10.1038/srep46211
Schools: School of Mechanical and Aerospace Engineering 
Rights: © 2017 The Author(s) (Nature Publishing Group). This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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