Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.088
Publication date: 23rd September 2021
Metallic transition metal dichalcogenides (MTMDCs) have manifested many intriguing properties in their bulk states, such as magnetism, charge density wave, and superconductivity. To propel the related applications, our group have also realized the direct syntheses of high-quality VX2 and TaX2 related MTMDCs materials on both conducting Au foils and insulating substrates.[1-2]. Particularly, we have obtained thickness-tunable 2H-TaS2 flakes and centimeter-size ultrathin films on an electrode material of Au foils. Extra high hydrogen evolution reaction (HER) efficiency was demonstrated on the CVD-grown 2H-TaS2/Au foils.[3] The first synthesis of vertically oriented 1T-TaS2 nanosheets were also reported on nanoporous gold (NPG) substrates. For scalable production, a universal synthetic route was also developed for achieving high-quality 2D MTMDC (e.g., TaS2, V5S8, and NbS2) nanosheets using microcrystalline NaCl crystals as templates via a facile CVD route. [4] This synthetic route is perfectly compatible with a facile water dissolution−filtration process for obtaining high-purity MTMDC nanosheets powders towards high-performance energy-related applications.
It is well-known that, the as-prepared 2D MTMDCs are mostly environmentally unstable, and finding more stable 2D TMDCs has become a very critical issue. Herein, thickness-tunable and large-domain (∼1.5 mm) 1T-NiTe2 were also achieved on the mica substrate. [5] Significantly, this 2D material presents ultrahigh conductivity (∼1.15 × 106 S m−1) and high catalytic activity in pH-universal HER, and more interestingly robust environmental stability. We further uncover that, the CVD-derived 1T-VTe2 nanosheets can serve as a high-performance electrode material thanks to its ultrahigh conductivity, and act as electro-catalysts with excellent electrocatalytic activity in HER. All these work should provide brand new insights into the direct syntheses and property investigations of nano-thick metallic 2D TMDCs crystals.
References
[1] Yanfeng Zhang*, et al., Chem. Soc. Rev. 44(2015), pp. 2587; Adv. Mater. 28(2016), pp. 10664; Coordin. Chem. Rev. 376(2018), pp. 1.; Nature Commun. 9(2018), pp. 979; ACS Nano 13 (2019), pp. 3649; Nano Lett. 17(2017), pp. 4908; Phys. Rev. B. 96(2017), pp075402.
[2] Yanfeng Zhang*, et al., Adv. Mater. 2017, pp. 1702359; ACS Nano 13 (2019), pp.885.
[3] Yanfeng Zhang*, et al., Nature Commun. 8(2017), pp. 958; Adv. Mater. 2018, pp. 1705916.
[4] Yanfeng Zhang*, et al., J. Am. Chem. Soc. 141(2019), pp 18694.
[5] Yanfeng Zhang*, et al., ACS Nano 15 (2021), pp.1858; ACS Nano 14 (2020), pp.9011.
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