Glucose intercalation induced 1T-G-MoS2 hybrids for high-performance rechargeable aqueous zinc-ion batteries

Owing to 1T phase MoS2 (1T-MoS2) possessing higher electron conductivity than 2H phase MoS2 (2H-MoS2), 1T-MoS2 is considered as a more promising electrode material for aqueous zinc-ion batteries (AZIBs). Herein, a glucose intercalation-assisted induction strategy is employed to prepare stable 1T-rich MoS2 hybrids (1T-G-MoS2) for boosting zinc storage performance. The glucose is intercalated into MoS2 through a one-step facile hydrothermal method, which expands the interlayer spacing and improves the hydrophilicity, facilitating reversible insertion/extraction kinetics of Zn2+ ions. Density functional theory (DFT) calculations indicate that the intercalated glucose can donate electrons to the Mo atoms, triggering reorganization of the Mo 4d orbitals and inducing phase transformation of MoS2 from 2H to 1T phase, thereby increasing the electron conductivity of MoS2 and promoting electron transfer. The enhanced electron and ion transfer as well as the more exposed active sites accelerate the reaction kinetics, leading to an improved electrochemical performance for AZIBs. The obtained 1T-G-MoS2 electrode exhibits a high discharge capacity of 192.62 mA h g-1 at 0.1 A g-1 and superior rate performance. Moreover, the enlarged interlayer spacing alleviates changes in the volume of 1T-G-MoS2 during the discharging/charging processes, giving it excellent cycling stability. The capacity retention can still reach 71.98% even after 500 cycles at 1 A g-1. This work deeply investigates the MoS2 phase transformation mechanism and its effect on the reaction kinetics, providing a promising solution for high-performance MoS2-based AZIBs.