24:T496,Molybdenum disulfide (MoS₂) has attracted considerable attention as a promising electrocatalyst for the hydrogen evolution reaction (HER). However, the catalytic HER performance of MoS₂ is significantly limited by the few active sites and low electrical conductivity. In this study, the growth of multiorientated polycrystalline MoS₂ using plasma-enhanced chemical vapor deposition (PECVD) for the HER is achieved. The MoS₂ is synthesized by sulfurizing a sputtered pillar-shaped Mo film. The relatively low growth temperature during the PECVD process results in multiorientated MoS₂ with an expanded interlayer spacing of ~0.75 nm, which provides abundant active sites, a reduced Gibbs free energy of H adsorption, and enhanced intralayer conductivity. In HER applications, the PECVD-grown MoS₂ exhibits an overpotential value of 0.45 V, a Tafel slope of 76 mV dec^-1, and excellent stability in strong acidic media for 10 h. The high HER performance achieved in this study indicates that two-dimensional MoS₂ has potential as an electrocatalyst for next-generation energy technologies.25:T4ed,MoSe₂ is an attractive transition-metal dichalcogenide with a two-dimensional layered structure and various attractive properties. Although MoSe₂ is a promising negative electrode material for electrochemical applications, further investigation of MoSe₂ has been limited, mainly by the lack of MoSe₂ mass-production methods. Here, we report a rapid and ultra-high-yield synthesis method of obtaining MoSe₂ nanosheets with high crystallinity and large grains by ampoule-loaded chemical vapor deposition. Application of high pressure to an ampoule-type quartz tube containing MoO₃ and Se powders initiated rapid reactions that produced vertically oriented MoSe₂ nanosheets with grain sizes of up to ∼100 μm and yields of ∼15 mg h^-1. Spectroscopy and microscopy characterizations confirmed the high crystallinity of the obtained MoSe₂ nanosheets. Transistors and lithium-ion battery cells fabricated with the synthesized MoSe₂ nanosheets showed good performance, thereby further indicating their high quality. The proposed simple scalable synthesis method can pave the way for diverse electrical and electrochemical applications of MoSe₂.

#	Concept	H-Index	Publications	Citations
1	Engineering	2	2	45
2	Applied Physics	2	2	45
3	Chemical Engineering	2	2	45
4	Computer Engineering	1	1	27
5	Materials Science	1	1	18

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