FeO nanoplates anchored on TiCT MXene with enhanced pseudocapacitive and electrocatalytic properties.

TiCT, as novel members of the two-dimensional material family, hold great promise for electrochemical energy storage and catalysis, however, the electrochemical performance of TiCT 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, TiCT supported FeO nanoplates (denoted as MXene-Fe), synthesized by a simple 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 at 1.0 A g and long cycling stability with about 81% capacitance retention after 10 000 cycles at 10.0 A g. 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 and a small Tafel slope of 65.1 mV dec. This work provides an effective strategy for developing novel TiCT-based functional materials with outstanding electrochemical performance for supercapacitors and electrocatalysis.