Thermoelectric Properties of Two-Dimensional Molybdenum-based MXenes

Hyunho Kim, Babak Anasori, Yury Gogotsi, Husam N. Alshareef

Research output: Contribution to journalArticlepeer-review

89 Scopus citations

Abstract

MXenes are an interesting class of 2D materials consisting of transition metal carbides and nitrides, which are currently a subject of extensive studies. Although there have been theoretical calculations estimating the thermoelectric properties of MXenes, no experimental measurements have been reported so far. In this report, three compositions of Mo-based MXenes (Mo2CTx, Mo2TiC2Tx, and Mo2Ti2C3Tx) have been synthesized and processed into free-standing binder-free papers by vacuum-assisted filtration, and their electrical and thermoelectric properties are measured. Upon heating to 800 K, these MXene papers exhibit high conductivity and n-type Seebeck coefficient. The thermoelectric power reaches 3.09×10-4 W m-1 K-2 at 803 K for the Mo2TiC2Tx MXene. While the thermoelectric properties of MXenes do not reach that of the best materials, they exceed their parent ternary and quaternary layered carbides. Mo2TiC2Tx shows the highest electrical conductivity in combination with the largest Seebeck coefficient of the three 2D materials studied.
Original languageEnglish (US)
Pages (from-to)6472-6479
Number of pages8
JournalChemistry of Materials
Volume29
Issue number15
DOIs
StatePublished - Jul 17 2017

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: Support for research reported in this publication was provided by King Abdullah University of Science and Technology (KAUST).

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