Journal
CHINESE CHEMICAL LETTERS
Volume 32, Issue 2, Pages 900-905Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2020.07.016
Keywords
First-principle calculations; Storage capacity; BC3 monolayer; Adsorption; Diffusion
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Funding
- National Natural Science Foundation of China [21503149]
- Program for Innovative Research Team in University of Tianjin [TD13-5074]
- Project of Hubei University of Arts and Science [2020kypyfy015]
- Hubei Superior and Distinctive Discipline Group of Mechatronics and Automobiles [XKQ2020021]
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The graphene-like BC3 monolayer exhibits excellent structural stability and high potassium storage capacity, with fast potassium atom migration and efficient adsorption properties. Additionally, tensile strains have marginal effects on the adsorption and diffusion performances of lithium, sodium, and potassium atoms on the BC3 monolayer.
With increasing demand for renewable energy, graphene-like BC3 monolayer as high performance electrode materials for lithium and sodium batteries are drawing more attention recently. However, its structural stability, potassium storage properties and strain effect on adsorption properties of alkali metal ions have not been reported yet. In this work, phonon spectra, AIMD simulations and elastic constants of graphene-like BC3 monolayer are investigated. Our results show that graphene-like BC3 monolayer possesses excellent structural stability and the maximum theoretical potassium storage capacity can reach up to 1653 mAh/g with the corresponding open circuit voltages 0.66 V. Due to potassium atom can be effectively adsorbed at the most energetically favorable h-CC site with obvious charge transfer, making adsorbed graphene-like BC3 monolayer change from semiconductor to metal which is really good for electrode utilization. Moreover, the migrations potassium atom on the graphene-like BC3 monolayer is rather fast with the diffusion barriers as low as 0.12 eV, comparing lithium atom with a relatively large diffusion barrier of 0.46 eV. Additionally, the tensile strains applied on the graphene-like BC3 monolayer have marginal effect on the adsorption and diffusion performances of lithium, sodium and potassium atoms. (C) 2020 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
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