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MXenes, such as Ti 3 C 2 T x , are promising materials for electrodes of supercapacitors (SCs). Colloidal techniques have potential for the fabrication of advanced Ti 3 C 2 T x composites with high areal capacitance (C S ). This paper reports the fabrication of Ti 3 C 2 T X -Fe 3 O 4 -multiwalled carbon nanotube (CNT) electrodes, which show C S of 5.52 F cm -2 in the negative potential range in 0.5 M Na 2 SO 4 electrolyte. Good capacitive performance is achieved at a mass loading of 35 mg cm -2 due to the use of Celestine blue (CB) as a co-dispersant for individual materials. The mechanisms of CB adsorption on Ti 3 C 2 T X , Fe 3 O 4 , and CNTs and their electrostatic co-dispersion are discussed. The comparison of the capacitive behavior of Ti 3 C 2 T X -Fe 3 O 4 -CNT electrodes with Ti 3 C 2 T X -CNT and Fe 3 O 4 -CNT electrodes for the same active mass, electrode thickness and CNT content reveals a synergistic effect of the individual capacitive materials, which is observed due to the use of CB. The high C S of Ti 3 C 2 T X -Fe 3 O 4 -CNT composites makes them promising materials for application in negative electrodes of asymmetric SC devices.

Composite Fe3O4-MXene-Carbon Nanotube Electrodes for Supercapacitors Prepared Using the New Colloidal Method