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J. Phys. Energy 3 (2021) 031503 N Tapia-Ruiz et al Figure 14. (a) Structures of semiconducting 2H- and metallic 1T-phase MoS2 . (b) Photograph of chemically exfoliated metallic MoS2 nanosheets suspended in water. (c) SEM image of 1T-phase MoS2 electrodes obtained by restacking exfoliated nanosheets. The inset shows the spacing between the restacked nanosheets, which could facilitate the intercalation and de-intercalation of Na ions. Reprinted with permission from [137]. Copyright (2011) American Chemical Society. Reprinted by permission from Springer Nature Customer Service Centre GmbH: Springer Nature, Nature Nanotechnology [138]. © 2015. spectrometry (RBS) technique can be employed to determine the composition and thickness of the SEI that forms on anodes during electrochemical cycling [143]. Concluding remarks In summary, the field of 2D TMDs is in a nascent phase. While 2D TMDs are interesting, several key challenges remain. Furthermore, much of the work on Na-ion batteries has been done on the semiconducting 2H phase of TMDs. This phase is hydrophobic and lacks conductivity, resulting in sluggish ionic diffusion. In contrast, the metastable metallic phase of TMDs has been less studied. The exfoliation of metallic TMDs and the restacking of 2D nanosheets into electrodes are likely to provide electrodes with better intercalation efficiency and faster kinetics. Acknowledgment This work was supported by the Faraday Institution (Grant No. FIRG018). 32PDF Image | 2021 roadmap for sodium-ion batteries
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