Fe₃O₄ nanoplates anchored on Ti₃C₂T MXene with enhanced pseudocapacitive and electrocatalytic properties

Ti₃C₂T, as novel members of the two-dimensional material family, hold great promise for electrochemical energy storage and catalysis, however, the electrochemical performance of Ti₃C₂T is largely limited by the self-restacking of their layers due to van der Waals forces. In this study, we report a high-performance electrode material, Ti₃C₂T supported Fe₃O₄ nanoplates (denoted as MXene-Fe), synthesized by a simple in situ wet chemistry method in a solvothermal system. The mesoporous MXene-Fe material as a supercapacitor electrode exhibits a high specific capacitance of 368.0 F g^-1 at 1.0 A g^-1 and long cycling stability with about 81% capacitance retention after 10 000 cycles at 10.0 A g^-1. Moreover, the optimized MXene-Fe also displays high electrocatalytic activity and stability toward the oxygen evolution reaction in alkaline solution (1.0 M KOH) with a low overpotential of 290 mV at 10 mA cm^-2 and a small Tafel slope of 65.1 mV dec^-1. This work provides an effective strategy for developing novel Ti₃C₂T-based functional materials with outstanding electrochemical performance for supercapacitors and electrocatalysis.