fig2

Figure 2. Fabrication, microstructure, and mechanical characterization of the PMA sponge electrode. (A) Schematic illustrations of the PMA sponge fabrication process; (B) Photographs of the MA sponge before and after PEDOT:PSS coating; (C) An SEM image of the MA sponge; (D) An SEM image of the PMA sponge with PEDOT:PSS membranes forming inside the sponge skeleton; (E) A high-resolution SEM image of the PMA sponge. The white arrows indicate that some MA ligaments ruptured during the fabrication process; (F) Photographs showing the compressibility of the PMA sponge; (G, H) Loading-unloading stress-strain curves of the MA and PMA sponges under maximum compressive strains varying from 30% to 90%. MA: melamine; PMA: poly (3,4-ethylenedioxythiophene) polystyrene sulfate/melamine; PEDOT: PSS: poly(3,4-ethylenedioxythiophene) polystyrene sulfonate; SEM: scanning electron microscopy.