The Synthesis of Porous Ti₃C₂T_x/SnSe Composite and Its Potassium Storage Performance

The porous MXene composite material (Ti₃C₂T_x/SnSe) was fabricated with the in-situ oxidation-etching method and the hydrothermal synthesis technology. The composition, structure and electrochemical properties of the prepared materials were evaluated. The research results showed that the porous Ti₃C₂T_x/SnSe electrode deliveed a capacity of 381.5 mA ·h/g at a current density of 0.05 A/g while the specific capacity of the pure SnSe electrode was only 119.2 mA ·h/g. At a current density of 1 A/g, the Ti₃C₂T_x/SnSe electrode showed an initial reversible specific capacity of 118.5 mA ·h/g and it remained at 35.4 mA ·h/g after 500 cycles. The excellent electrochemical performance of the porous Ti₃C₂T_x/SnSe electrode material mainly benefits from the high conductivity of Ti₃C₂T_x, which not only alleviates the volume expansion of SnSe but also provides a good path for the ionic transfer.