Carbon Dot/Ti3C2Tx MXene Hybrid on Carbon Cloth as a Flexible and Binder-Free Supercapacitor Electrode with Commercial Scale Mass Loading

Flexible and binder-free carbon dot/titanium carbide (CD/Ti3C2Tx) MXene electrode for supercapacitor is fabricated at commercial scale mass loading. The decline in specific gravimetric capacitance due to high mass loading is compensated by the synergistic enhancement in properties of the prepared CD/Ti3C2Tx hybrid. The optimized hybrid electrode gives a specific gravimetric capacitance of 373 F g(-1) at a current density of 1 A g(-1.) The symmetric supercapacitor developed using the electrode has a specific gravimetric capacitance of 50 F g(-1.), energy density of 4.4 Wh kg(-1), and power density of 66.6 W kg(-1) at a current density of 1 A g(-1.). The device retains 90.8% capacitance after 5000 cycles when operated at a current density of 1 A g(-1.). Raman spectroscopy analysis provides an evaluation of the evolution of the electrochemical performance of the hybrid with the CD concentration. The work will open up new avenues in textile-based supercapacitor technology for wearable electronics applications utilizing environment-benign techniques.

Automated summary

A flexible and binder-free carbon dot/titanium carbide (CD/Ti3C2Tx) MXene electrode for a supercapacitor was developed at a commercial scale mass loading. The decline in specific gravimetric capacitance due to high mass loading was compensated by the enhancement in properties of the prepared CD/Ti3C2Tx hybrid. The optimized hybrid electrode exhibited a specific gravimetric capacitance of 373 F g(-1) at a current density of 1 A g(-1).