Tailoring interlayer spacing in binder free Ti3C2Tx/NiMoO4-P hybrid electrode for enhanced supercapacitor performance

In this study, we present a novel electrode comprised of Ti3C2Tx MXene, which has been integrated with NiMoO4 nanoflakes (referred to as Ti3C2Tx/NiMoO4-P), achieved through a straightforward mixing of their respective solutions. The NiMoO4 particles inhibited the restacking of MXene sheets, thus leading to the effective utilization of active surface area by facilitating the intercalation of electrolyte ions. The binder -free Ti3C2Tx/NiMoO4-P electrode displayed a superior specific capacitance of 550 F g-1 (440 C g-1) as compared to an electrode developed through a hydrothermal and calcination treatment, referred to as Ti3C2Tx/NiMoO4-H which displayed a specific capacitance of 472 F g-1 (377 C g-1) at 2 mV s-1 in 0.5 M H2SO4 solution. Moreover, the Ti3C2Tx/ NiMoO4-P electrode exhibited excellent cyclic stability with 81 % capacitance retention after 5000 cycles at 50 mV s-1. A symmetric supercapacitor consisting of Ti3C2Tx/NiMoO4-P electrode delivered a maximum capacitance of 71.5 F g-1 at 0.5 A g-1 with a high energy density (9.3 Wh kg- 1 at a specific power density of 2.5 kW kg - 1). The heterostructure of Ti3C2Tx/NiMoO4-P provided significant insight into enhancing the energy storage performance by controlling the interlayer spacing to develop flexible energy storage devices.