In situ fabrication of dry/gel bilayer Ti3C2Tx films for high-rate micro-supercapacitors

Abstract

A H₂SO₄-Ti₃C₂T_x ion-gel is in situ fabricated to prevent the restacking of Ti₃C₂T_x for high-rate micro-supercapacitors. The ion-gel pillared by an electrolyte possesses an enlarged interlayer spacing facilitating ion transport. Furthermore, a bilayer structure is designed with dry Ti₃C₂T_x for fast electron conduction. The bilayer Ti₃C₂T_x film shows improved capacitance from 49% to 73% of the initial capacitance at a high scan rate of 200 mV s⁻¹, along with excellent cycle stability. This study opens up a concise and efficient way for high-performance micro-supercapacitors.