High-temperature solvent-free sulfidation of MoO3 confined in a polypyrrole shell: MoS2 nanosheets encapsulated in a nitrogen, sulfur dual-doped carbon nanoprism for efficient lithium storage†
Hierarchical nanostructured metal sulfides in a rectangular prism shape are highly attractive as a promising electrode material for lithium ion energy storage. Herein, we develop a simultaneous pyrolysis and sulfidation strategy to synthesize yolk-shelled MoS2@nitrogen, sulfur dual-doped carbon (MoS2@NSC) nanoprisms. Upon encapsulating MoO3 nanoprisms into a polypyrrole (PPy) shell, a high-temperature solvent-free sulfidation reaction from MoO3 to hierarchical MoS2 nanosheets could take place within the PPy nanoreactor, and the PPy nanoreactor simultaneously converted into NSC hollow nanoprisms. Owing to the compositional and structural superiority, the MoS2@NSC nanoprisms with a well-defined sheet-in-prism superstructure manifested enhanced electrochemical activity as a promising anode material for lithium-ion batteries including a high reversible capacity (960 mA h g−1 at 0.1 A g−1), excellent cycling stability (800 mA h g−1 at 0.1 A g−1 up to 300 cycles), and superior rate capability (440 mA h g−1 at 2 A g−1).