High-Throughput Production of 1T MoS2 Monolayers Based on Controllable Conversion of Mo-Based MXenes

Zhiguo Du; Yu Guo; Haiyang Wang; Jianan Gu; Yongzheng Zhang; Zongju Cheng; Bin Li; Songmei Li; Shubin Yang

doi:10.1021/acsnano.1c05268

High-Throughput Production of 1T MoS₂ Monolayers Based on Controllable Conversion of Mo-Based MXenes

ACS Nano. 2021 Dec 28;15(12):19275-19283. doi: 10.1021/acsnano.1c05268. Epub 2021 Dec 13.

Authors

Zhiguo Du¹, Yu Guo¹, Haiyang Wang¹, Jianan Gu¹, Yongzheng Zhang¹, Zongju Cheng¹, Bin Li¹, Songmei Li¹, Shubin Yang¹

Affiliation

¹ Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education, School of Materials Science and Engineering, Beihang University, 100191 Beijing, China.

PMID: 34898180
DOI: 10.1021/acsnano.1c05268

Abstract

Although transition metal dichalcogenides (TMDs) monolayers are widely applied in electronics, optics, catalysis, and energy storage, their yield or output is commonly very low (<1 wt % or micrometer level) based on the well-known top-down (e.g., exfoliation) and bottom-up (e.g., chemical vapor deposition) approaches. Here, 1T MoS₂ monolayers with a very high fraction of ∼90% were achieved via the conversion of Mo-based MXenes (Mo₂CT_x and Mo_1.33CT_x) at high temperatures in hydrogen sulfide gas, in which the Mo-layer of Mo-based MXenes could be transformed to MoS₂ monolayers and the Mo vacancies facilitate the gliding of sulfur layers to form 1T MoS₂. The resultant 1T MoS₂ monolayers with numerous vacancies exhibit strong chemisorption and high catalytic activity for lithium polysulfides (LiPSs), delivering a reversible capacity of 736 mAh g^-1 at 0.5 C, a superior rate capability of 532 mAh g^-1 at 5 C, and a good stability up to 200 cycles at 1 C in lithium-sulfur (Li-S) batteries.

Keywords: 1T phase; MXenes; TMDs; lithium−sulfur batteries; monolayers.