Improved capacitance of nitrogen-doped delaminated two-dimensional titanium carbide by urea-assisted synthesis

Two-dimensional transition metal carbides (MXenes) were recently emerged as promising electrode materials for energy storage applications. Herein, we report a high-capacity supercapacitor material based on nitrogen-doped delaminated titanium carbides (N-d-Ti₃C₂) synthesized through the facile urea-assisted delamination of large-scale Ti₃C₂ and carbonization of delaminated Ti₃C₂ (d-Ti₃C₂) mixed with urea. The two-dimensional N-d-Ti₃C₂ nanosheets exhibit a high specific capacitance of 266.5 F g⁻¹ at the scan rate of 5 mV s⁻¹ in 6 M KOH electrolyte solution, with a high capacitance retention capability. This new type of nitrogen-doped delaminated titanium carbide could be a promising electrode material for high-performance supercapacitors.