S-Doped TiSe2 Nanoplates/Fe3 O4 Nanoparticles Heterostructure.

2D Sulfur-doped TiSe2 /Fe3 O4 (named as S-TiSe2 /Fe3 O4 ) heterostructures are synthesized successfully based on a facile oil phase process. The Fe3 O4 nanoparticles, with an average size of 8 nm, grow uniformly on the surface of S-doped TiSe2 (named as S-TiSe2 ) nanoplates (300 nm in diameter and 15 nm in thickness). These heterostructures combine the advantages of both S-TiSe2 with good electrical conductivity and Fe3 O4 with high theoretical Li storage capacity. As demonstrated potential applications for energy storage, the S-TiSe2 /Fe3 O4 heterostructures possess high reversible capacities (707.4 mAh g(-1) at 0.1 A g(-1) during the 100th cycle), excellent cycling stability (432.3 mAh g(-1) after 200 cycles at 5 A g(-1) ), and good rate capability (e.g., 301.7 mAh g(-1) at 20 A g(-1) ) in lithium-ion batteries. As for sodium-ion batteries, the S-TiSe2 /Fe3 O4 heterostructures also maintain reversible capacities of 402.3 mAh g(-1) at 0.1 A g(-1) after 100 cycles, and a high rate capacity of 203.3 mAh g(-1) at 4 A g(-1) .