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Poly (3, 4-ethylenedioxythiophene)(PEDOT) doped with poly (styrene sulfonate)(PSS) is the most commonly used conducting polymer in organic bioelectronics. However, electrochemical capacitances exceeding the current state-of-the-art are required for enhanced transduction and stimulation of biological signals. The long-term stability of conducting polymer films during device operation and storage in aqueous environments remains a challenge for routine applications. In this work, we electrochemically synthesize a PEDOT composite comprising the water dispersible two-dimensional conducting material Ti 3 C 2 MXene. We find that incorporating MXene as a co-dopant along with PSS leads to PEDOT: PSS: MXene films with remarkably high volumetric capacitance (607.0±85.3 F cm− 3) and stability (capacity retention= 78.44%±1.75% over 500 cycles), outperforming single dopant-comprising PEDOT films, ie …