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Selective Hydrogenation Promotes Anisotropic Thermoelectric Properties of TPDH-Graphene
Published 14 Feb 2024 in cond-mat.mtrl-sci, physics.app-ph, physics.chem-ph, and physics.comp-ph | (2402.09572v1)
Abstract: We have combined DFT calculations with the Boltzmann semiclassical transport theory to investigate the effect of selective hydrogenation on the thermoelectric properties of tetra-penta-deca-hexagonal graphene (TPDH-gr), a recently proposed new 2D carbon allotrope. Our results show that the Seebeck coefficient is enhanced after hydrogenation. The conductivity along the x direction is increased almost eight times while being almost suppressed along the y direction. This behavior can be understood in terms of the electronic structure changes due to the appearance of a Dirac-like cone after the selective hydrogenation. Consistent with the literature, the electronic contribution to thermal conductivity displays the same qualitative behavior as the conductivity, as expected from the Wiedemann-Franz law. The increase in thermal conductivity with temperature limits the material's power factor. The significant increase in the Seebeck coefficient and conductivity increases also contribute to the thermal conductivity increase. These results show that hydrogenation is an effective method to improve the TPDH-gr thermoelectric properties, and this carbon allotrope can be an effective material for thermoelectric applications.
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