Aerosol Jet Printing of Hybrid Ti ₃ C ₂ T _<i>x</i> MXene/PEDOT:PSS Nanospheres for Flexible Planar/Fiber Architectured Micro‐Supercapacitors

Flexible micro‐supercapacitors (FSCs), with their outstanding flexibility and low weight, offer great potential for a wide range of applications in the field of flexible electronics. Herein, the few‐layer Ti 3 C 2 T x MXene hybridized with commercial PEDOT:PSS dispersion are used as ink for aerosol jet printing (AJP) to fabricate interdigitated and double‐helix electrodes on 2D polyethylene terephthalate (PET) films and 1D thermoplastic polyurethane fibers, respectively. By controlling the evaporation behavior of aerosol microdroplets during the printing process, a transformation from 2D Ti 3 C 2 T x MXene nanosheets to 3D wrinkled spherical structures on the surface of the flexible substrate is achieved, which increases the accessibility of ions to the electrochemical active sites. In addition, the introduction of PEDOT:PSS as a “bridge” connecting the Ti 3 C 2 T x MXene‐wrinkled spheres not only enhances the electronic conductivity within the electrode but also improves the bending stability of the electrode. Consequently, the optimized MXene/PEDOT:PSS‐based planar and fiber‐architectured FSCs exhibit excellent areal capacitance and flexible stability. This work highlights the significant potential of AJP technology in developing electronic devices with fascinating functionalities on various flexible substrates.