Preparation and electrochemical performance of modified Ti 3 C 2 T x /polypyrrole composites

MXenes with a large surface area have been widely studied to improve the pseudocapacitance of electrode materials by combining conductive polymer materials. In this article, a superficial strategy to enhance the electrochemical properties by in situ polymerization of a pyrrole monomer between the Ti 3 C 2 T x layers modified with 1,5‐naphthalene disulfonic acid (NA) and cetyltrimethylammonium bromide (CTAB) was investigated. It is found that polypyrrole (PPy) and Ti 3 C 2 T x can be combined through strong interactions between each other, and the specific capacitance of the modified Ti 3 C 2 T x /PPy composite was increased to a maximum value of 437 F g −1 , which was more than thrice higher than that of pure PPy. The composite also exhibited good cycling performance (76% capacitance retention after 1000 cycles). Moreover, owing to the synergistic effect between the PPy and Ti 3 C 2 T x layers, the composite provided better electron or ion transfer and surface redox processes than that of pure PPy, which indicated that this composite can be used as a promising electrode material for supercapacitors. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47003.