Hollow tubular-structured molybdenum diselenide/carbon hybrid decorated by titanium dioxide nanoparticles for superior lithium-ion storage

Abstract

One-dimensional nanomaterials with hollow structures could provide large space for ion storage and charge accumulation. Herein, TiO₂/MoSe₂-Carbon nanotube composite (NT) materials were designed and fabricated by the template method and the chelation coordination reaction. The stability and conductivity were improved by the presence of titanium and hollow tubular-architecture carbon in the whole structure. As a result, the as-prepared TiO₂/MoSe₂-Carbon hybrid achieved a high-rate performance of 760.0 mAh·g⁻¹ at a current density of 0.1 A·g⁻¹, while still obtaining stability after 300 charge/discharge cycles. The enhancement of the lithium storage capacity mainly contributed to the acceleration of the electron conductivity and the storage kinetics. Moreover, the hollow structure reduced the volume strain and stress caused by the rapid insertion and removal of lithium ions, which ensured the favorable stability of lithium storage. The experiment shows that the kinetic of the TiO₂/MoSe₂-carbon hybrid during the lithium storage process is dominated by the pseudocapacitance mechanism. This work provides a new idea and scheme for the design and preparation of hierarchical nanotube composite electrode materials.

Graphic Abstract