In situ fabrication of dry/gel bilayer Ti 3 C 2 T x films for high-rate micro-supercapacitors

A H 2 SO 4 -Ti 3 C 2 T x ion-gel is in situ fabricated to prevent the restacking of Ti 3 C 2 T 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 Ti 3 C 2 T x for fast electron conduction. The bilayer Ti 3 C 2 T 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.