A facile supercritical fluid synthesis of cobalt sulfide integrated with MXene and PANI/PEDOT nanocomposites as electrode material for supercapacitor applications

[Display omitted] •In this paper, a simple, cost-effective, and time-saving technique for fabricating cobalt sulfide integrated with MXene and PANI/PDOT nanocomposites materials is presented in Supercritical synthesis.•First to synthesise and evaluate ternary composites CoS/MXene Supercapacitors using the supercritical fluid method (SCF).•Devise fabrication ternary CoS/MXene/PANI and CoS/MXene/PDOT to evaluate the performance of the composite in Supercapacitors.•Enhancement in specific capacitance was observed with inclusion of PANI (407 F/g) and further enhanced with PEDOT (630 F/g) at 2 A/g.•Devise Supercapacitors observed that the CoS/MXene/PEDOT exhibits maximum retention of 97% after 10,000 cycles in comparison to the CoS/MXene/PANI (96%). We report the synthesis of ternary CoS/MXene/PANI and CoS/MXene/ PEDOT composites using supercritical fluid (SCF) method for the first time. These fabricated materials along with CoS/MXene was gone through electrochemical investigations using three electrode system. Enhancement in specific capacitance was observed with inclusion of PANI (407 F/g) and further enhanced with PEDOT (630 F/g) at 2 A/g. Therefore, symmetric device using coin cell technique was fabricated by taking CoS/MXene/PEDOT and CoS/MXene/PANI as electrode material. These coin cells were further be examined on the basis of CV, GCD and EIS and it was observed that the specific capacitance was enhance in CoS/MXene/PEDOT (331.1 F/g) over CoS/MXene/PANI (246 F/g) at 2 A/g. For the material, the capacitance retention was calculated to evaluate the charge storage stability and it was observed that the CoS/MXene/PEDOT (97%) is slightly higher stable than CoS/MXene/PANI (96%). Overall electrochemical performance was observed to be enhanced by inclusion of PANI and PEDOT because it has lower resistance and higher specific capacitance along with these polymers, MXene nanosheets also play a vital role in enhancing the specific capacitance of the heterostrucutre by providing the larger surface area.