Due to its attractive properties, such as a high tuneable conductivity, pseudocapacitance, biocompatibility and chemical stability , polyaniline (PANI) has attracted significant research interest. PANI has been successfully incorporated in various composites for electrochemical applications (e.g. supercapactior  or sensor applications ), however its processability is still very limited and benefits from novel manufacturing techniques like additive manufacturing (AM) cannot fully be accessed yet . Recently developed AM techniques  have opened up new possibilities for the application of PANI in AM. In this work, a novel AM process based on the thermal doping of the emeraldine form of PANI, PANI-EB, with dodecyl benzene sulfonic acid (DBSA) is presented, which enables the fabrication of complex electrode geometries with conductivities up to 20 000 mS/cm . For this, a commercially available Prusa i3 MK3S+ was modified with a custom made syringe extrusion system to enable the extrusion of a viscous PANI-EB/DBSA paste. In this study, the influence of the various printing parameters, such as hotbed temperature and treatment times, was characterised and the printed electrodes were analysed using Fourier-transform infrared spectroscopy – attenuated total reflection, X-ray powder diffraction, thermogravimetric analysis and scanning electron microscopy. The printed electrodes were used in a proof-of-concept fabrication of a fully 3D printed symmetric interdigitated electrochemical capacitor to demonstrate the easy and straightforward integration of the printed electrodes in electrochemical prototypes.
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