S‐Doped TiSe 2 Nanoplates/Fe 3 O 4 Nanoparticles Heterostructure

2D Sulfur‐doped TiSe 2 /Fe 3 O 4 (named as S‐TiSe 2 /Fe 3 O 4 ) heterostructures are synthesized successfully based on a facile oil phase process. The Fe 3 O 4 nanoparticles, with an average size of 8 nm, grow uniformly on the surface of S‐doped TiSe 2 (named as S‐TiSe 2 ) nanoplates (300 nm in diameter and 15 nm in thickness). These heterostructures combine the advantages of both S‐TiSe 2 with good electrical conductivity and Fe 3 O 4 with high theoretical Li storage capacity. As demonstrated potential applications for energy storage, the S‐TiSe 2 /Fe 3 O 4 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‐TiSe 2 /Fe 3 O 4 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 .