The CNT solution was spray-coated onto the surface of the middle layer of the PAM/LiCl hydrogel electrolyte to serve as the top-layer current collector. To prevent short-circuiting, a piece of transparent PE film with a central hole was placed over the substrate to shield the bottom CNT layer during spray-coating. The PEDOT:PSS PH1000 dip-coating process was repeated to form a uniform electrochromic layer of PEDOT:PSS on the CNT-coated surface. The PEDOT:PSS-coated device was left to dry thoroughly in a fume hood overnight. Once dried, the PE film was removed, PELCO ® Conductive Silver Paint was applied along the circumference of both the top and bottom CNT layers. This coating enhanced electrical conductivity and protected the CNT layer from mechanical damage.