Comprehensive Study of Lithium Adsorption and Diffusion on Janus Mo/WXY (X, Y = S, Se, Te) Using First-Principles and Machine Learning Approaches

dc.contributor.authorChaney, Gracie
dc.contributor.authorIbrahim, Akram
dc.contributor.authorErsan, Fatih
dc.contributor.authorÇakır, D.
dc.contributor.authorAtaca, Can
dc.date.accessioned2021-08-06T17:26:47Z
dc.date.available2021-08-06T17:26:47Z
dc.date.issued2021-07-26
dc.description.abstractThe structural asymmetry of two-dimensional (2D) Janus transition-metal dichalcogenides (TMDs) produces internal dipole moments that result in interesting electronic properties. These properties differ from the regular (symmetric) TMD structures that the Janus structures are derived from. In this study, we, first, examine adsorption and diffusion of a single Li atom on regular MX2 and Janus MXY (M = Mo, W; XY = S, Se, Te) TMD structures at various concentrations using first-principles calculations within density functional theory. Lithium adsorption energy and mobility differ on the top and bottom sides of each Janus material. The correlation between Li adsorption energy, charge transfer, and bond lengths at different coverage densities is carefully examined. To gain more physical insight and prepare for future investigations into regular TMD and Janus materials, we applied a supervised machine learning (ML) model that uses clusterwise linear regression to predict the adsorption energies of Li on top of 2D TMDs. We developed a universal representation with a few descriptors that take into account the intrinsic dipole moment and the electronic structure of regular and Janus 2D layers, the side where the adsorption takes place, and the concentration dependence of adatom doping. This representation can easily be generalized to be used for other impurities and 2D layer combinations, including alloys as well. At last, we focus on analyzing these structures as possible anodes in battery applications. We conducted Li diffusion, open-circuit voltage, and storage capacity simulations. We report that lithium atoms are found to easily migrate between transition-metal (Mo, W) top sites for each considered case, and in these respects, many of the examined Janus materials are comparable or superior to graphene and regular TMDs. In addition, we report that the side with higher electronegative chalcogen atoms is suitable for Li adsorption and only MoSSe and MoSeTe can be suitable for full coverage of Li atoms on the surface. Bilayer Li adsorption was hindered due to negative open-circuit voltage. Bilayer Janus structures are better suited for battery applications due to less volumetric expansion/contraction during the discharge/charge process and having higher storage capacity. Janus monolayers undergo a transition from semiconducting to metallic upon adsorption of a single Li ion, which would improve anode conductivity. The results imply that the examined Janus structures should perform well as electrodes in Li-ion batteries.en_US
dc.description.sponsorshipPart of the calculations have been carried out at UMBC High Performance Computing Facility (HPCF). This work was supported by the National Science Foundation through Division of Materials Research under NSF DMR-1726213 Grant.en_US
dc.description.urihttps://pubs.acs.org/doi/full/10.1021/acsami.1c05508en_US
dc.format.extent52 pagesen_US
dc.genrejournal articlesen_US
dc.genrepreprintsen_US
dc.identifierdoi:10.13016/m2ouiv-yahl
dc.identifier.citationChaney, Gracie et al.; Comprehensive Study of Lithium Adsorption and Diffusion on Janus Mo/WXY (X, Y = S, Se, Te) Using First-Principles and Machine Learning Approaches; ACS Applied Materials & Interfaces, 13, 30, 36388-36406, 26 July, 2021; https://doi.org/10.1021/acsami.1c05508en_US
dc.identifier.urihttps://doi.org/10.1021/acsami.1c05508
dc.identifier.urihttp://hdl.handle.net/11603/22327
dc.language.isoen_USen_US
dc.publisherACS Publicationsen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department Collection
dc.relation.ispartofUMBC Faculty Collection
dc.relation.ispartofUMBC Student Collection
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.en_US
dc.rightsThis document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in ACS Applied Materials & Interfaces, copyright © American Chemical Society after peer review. To access the final edited and published work see https://doi.org/10.1021/acsami.1c05508.
dc.subjectUMBC High Performance Computing Facility (HPCF)
dc.titleComprehensive Study of Lithium Adsorption and Diffusion on Janus Mo/WXY (X, Y = S, Se, Te) Using First-Principles and Machine Learning Approachesen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0002-0354-9029en_US
dcterms.creatorhttps://orcid.org/0000-0003-0049-105Xen_US
dcterms.creatorhttps://orcid.org/0000-0003-4959-1334en_US

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