The effect of different type of doped-PPy coatings on the electrochemical characteristics of Ti۳C۲Tx Mxene

In this work, we investigated the effect of pure and doped PolyPyrrole coatings on the super-capacitive behavior of two dimensional Ti۳C۲Tx MXene layers. Ti۳C۲Tx nano-sheets were derived by the chemical etching of Ti۳AlC۲ MAX-phase using HF solution. Polypyrrole was polymerized and deposited on the surface of Ti۳C۲Tx nano-layers by an in-situ polymerization method. In the polymerization step, ۴ different types of MXene/PPy solution were prepared: pure PPy/MXene and doped-PPy/MXene with three different dopants named as "α-NSA", "AQSANa,SSCA" and "CSA". Since the intercalation of electrochemically active nano-materials between the Ti۳C۲Tx layers increase the accessibility of ions to the charge storage active sites and the introduction of dopants to PPy structure increases its electrical conductivity, it was expected that all of these composites had better electrochemical behavior that pristine MXene. However, according to our investigation, only one of these PPy/MXene composites had better electrochemical performance