MoS2/TiO2 Heterostructures In Situ Constructed on Mo2Ti2C3Tx MXene for High-Rate and Stable Li+/Na+ Storage

Out-of-plane ordered Mo2Ti2C3Tx MXene is composed of M-site binary metals with richer structural compositions and physicochemical properties, thus becoming a potential candidate for energy storage materials. Here, the microstructures of pre-etched Mo2Ti2C3Tx MXene were cleverly modified by the hydrothermal method at 250 °C and a sulfur-containing atmosphere, while MoS2/TiO2 heterostructures were in situ constructed on Mo2Ti2C3Tx MXene. The as-prepared Mo2Ti2C3Tx@MoS2/TiO2 hybrids deliver excellent lithium/sodium storage properties, especially outstanding rate properties and robust cycling stability. At 5 A g–1, Mo2Ti2C3Tx@MoS2/TiO2 provides reversible Li+ (377.8 mAh g–1)/Na+ (133.5 mAh g–1) storage capacity. Capacity preservation reaches 83.7%/74% over 4500/30,000 cycles in LIBs/SIBs. This paper highlights the importance of rational structural modification by utilizing the rich metal compositions of M-sites in MXene, effectively enhancing its lithium/sodium storage capacity and broadening the further application of double transition metal MXene in secondary batteries.