In this paper, the sandwich PEDOT:PSS@MXene film electrode was prepared by uniformly coating PEDOT:PSS film on the surface of MXene through template-assisted polymerization. The film improves the stability of the composite by protecting the Ti layer.
The specific capacitance of PEDOT:PSS@MXene performs 185.5 F g−1 at 5 mV s−1. The desalination capacity of hybrid AC//PEDOT:PSS@MXene cell in 500 mg L−1 NaCl solution is 35.8 mg g−1.
After 40 desalting cycles, the cell performs better retention rate than AC//MXene cell (82.5 %), which keeps 97.2 %.
The morphology and structure of composite show no exists of TiO2 after 40 desalting cycles, indicating that PEDOT:PSS as a coating film can achieve high reliability capacitive deionization of MXene.