Yolk-shell-structured MoSe2 microspheres were prepared via a simple selenization process of MoO3 microspheres. The yolk-shell-structured MoSe2 and MoO3 microspheres delivered initial discharge capacities of 527 and 465 mA h g-1 in the voltage range of 0.001-3 V vs. Na/Na+ at a current density of 0.2 A g-1, respectively, and their discharge capacities after 50 cycles were 433 and 141 mA h g-1, respectively. The yolk-shell-structured MoSe2 microspheres also exhibited outstanding high rate capabilities. The hierarchical yolk-shell structure comprised of wrinkled nanosheets facilitated fast Na-ion and electron kinetics, and buffered the large volume changes encountered during cycling.
ASJC Scopus subject areas
- Materials Science(all)