Abstract
We report a facile two-furnace APCVD synthesis of 2H-WSe2. A systematic study of the process parameters is performed to show the formation of the phase-pure material. Extensive characterization of the bulk and exfoliated material confirm that 2H-WSe2 is layered (i.e., 2D). X-ray diffraction (XRD) confirms the phase, while high-resolution scanning electron microscopy (HRSEM), high-resolution transmission electron microscopy (HRTEM), and atomic force microscopy (AFM) clarify the morphology of the material. Focused ion beam scanning electron microscopy (FIB-SEM) estimates the depth of the 2H-WSe2 formed on W foil to be around 5-8 μm, and Raman/UV-vis measurements prove the quality of the exfoliated 2H-WSe2. Studies on the redox processes of lithium-ion batteries (LiBs) show an increase in capacity up to 500 cycles. On prolonged cycling, the discharge capacity up to the 50th cycle at 250 mA/g of the material shows a stable value of 550 mAh/g. These observations indicate that exfoliated 2H-WSe2 has promising applications as an LiB electrode material.
Original language | English |
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Pages (from-to) | 19409-19421 |
Number of pages | 13 |
Journal | ACS Omega |
Volume | 5 |
Issue number | 31 |
DOIs | |
State | Published - 11 Aug 2020 |
Bibliographical note
Publisher Copyright:Copyright © 2020 American Chemical Society.
Funding
G.D.N. is thankful to the Israel Science Foundation and Israel Prime Ministry Office for alternatives initiative for partial funding of this study under the Israel Research center for Electrochemical Propulsion (INREP) (Grant: ISF 2797/11) and European Union’s Horizon 2020 research and innovation program under grant agreement no. 814413, project ADMAIORA. Madina Telkhozhayeva is thankful to Erasmus + ICM (ERASMUS + KA107 ICM).
Funders | Funder number |
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Israel Prime Ministry Office | |
Horizon 2020 Framework Programme | 814413 |
Israel Science Foundation | |
Israel National Research Center for Electrochemical Propulsion | ISF 2797/11 |