Abstract
A new form of nanorattle, WS2@WS2 nanorattle, is prepared for the first time by direct sulphidation of pre-synthesised W@WS2 nanorattle template at 350 °C. Its microstructural and crystalline structures are characterized, and its electrocatalytic activity and stability in the hydrogen evolution reaction examined. WS2 nanoflakes are formed in-situ from sulphidation of the original W cores, and remain in the final WS2@WS2 nanorattles. They are well dispersed, exposing effectively their edges (catalytically active sites) to the reacting species. Consequently, the as-prepared WS2@WS2 nanorattles exhibit excellent electrocatalytic activity and stability. This finding, along with the novel synthesis technique developed, makes WS2@WS2 nanorattle a very promising electrocatalyst for future hydrogen generation. Furthermore, the synthesis strategy used in this work can be readily extended/modified to fabricate other important types of transitional metal nanorattles (e.g., MoS2@MoS2 MoSe2@MoS2 and WC@WS2), potentially benefiting more application areas.
Published Version
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