Designing the MXene/molybdenum diselenide hybrid nanostructures for high-performance symmetric supercapacitor and hydrogen evolution applications

Engineering the physical characteristics of a novel Ti₃C₂ MXene/MoSe₂ hybrid by a facile methodology is crucial for synergistic chemical interactions and improved aspects. Highly conductive Ti₃C₂ MXene, functioned as an outstanding support together with the active sites of MoSe₂ in the hybrid structure, increases the active area and porosity to increase the insertion/abstraction of electrolyte ions. The synergistic MXene/MoSe₂ hybrid-based symmetric supercapacitor delivered an enhanced capacitance of 350 F g⁻¹ with worthy solidity (93% of retained capacitance after 5000 cycles) and a good specific energy of 48 Wh kg⁻¹ at a specific power of 500 W kg⁻¹. MXene/MoSe₂ unveiled fabulous electrocatalytic behavior of hydrogen evolution with overpotentials of 136 and 149 mV at 10 mA cm⁻² and Tafel slopes of 88 and 83 mV dec⁻¹ in acidic and base solutions, respectively. This work surfaces the way of designing distinct two-dimensional (2D)/2D heterostructures for efficient energy storage/conversion applications.