The advantages of CNTs for a successful ASPIRE are threefold: (i) Acid-treated CNTs retain high-COOH functional groups, facilitating good dispersion in a polar solvent for solution processability . The high hydrophilicity of these CNT networks also allows the PEDOT:PSS aqueous solution to penetrate the CNT networks and to contact the PAM/LiCl hydrogel electrolyte to facilitate vertical ion transportation. (ii) CNTs are stable at the operating redox potential of PEDOT:PSS around ±1.1 V versus Ag/AgCl . Silver nanowires (AgNWs) are also widely used as a solution-processed current collector. However, their low oxidizing potential (0.8 V vs. SHE) makes them prone to oxidation and corrosion, thereby compromising the cycle life stability of the device (Fig. ). (iii) CNTs tend to aggregate and form bundles during solvent evaporation due to the Van der Waals forces. These bundles consist of up to ten to hundreds of single-walled carbon nanotubes, each several microns long, arranged in a hexagonal close-packed structure . When the CNT-dispersed solution is sprayed onto a substrate, the densely packed bundles interconnect, forming random CNT networks. The random networks establish a horizontal electrical pathway while the pores provide vertical channels for ion movement (Fig. ).