The study explores the pseudocapacitance of MXene nanosheets, specifically Ti3C2Tx, for high-power sodium-ion hybrid capacitors. MXenes, derived from MAX phases, exhibit high electrical conductivity and large surface areas, making them promising pseudocapacitor electrodes. The research demonstrates that Ti2CTx, a pseudocapacitor electrode material, operates at an average potential of 1.3 V with a reversible capacity of 175 mAh g−1. When integrated into a full cell with alluadite Na2Fe2(SO4)3 as the positive electrode, the system achieves a high specific energy of 260 Wh kg−1 and a specific power of 1.4 kW kg−1, overcoming the trade-off between energy and power densities in conventional electrochemical energy storage systems. The pseudocapacitance mechanism allows for faster charge-discharge rates and higher rate capabilities compared to ion intercalation and double-layer mechanisms, making MXene nanosheets a promising material for advanced Na-ion hybrid capacitors.The study explores the pseudocapacitance of MXene nanosheets, specifically Ti3C2Tx, for high-power sodium-ion hybrid capacitors. MXenes, derived from MAX phases, exhibit high electrical conductivity and large surface areas, making them promising pseudocapacitor electrodes. The research demonstrates that Ti2CTx, a pseudocapacitor electrode material, operates at an average potential of 1.3 V with a reversible capacity of 175 mAh g−1. When integrated into a full cell with alluadite Na2Fe2(SO4)3 as the positive electrode, the system achieves a high specific energy of 260 Wh kg−1 and a specific power of 1.4 kW kg−1, overcoming the trade-off between energy and power densities in conventional electrochemical energy storage systems. The pseudocapacitance mechanism allows for faster charge-discharge rates and higher rate capabilities compared to ion intercalation and double-layer mechanisms, making MXene nanosheets a promising material for advanced Na-ion hybrid capacitors.