Films of directionally oriented carbon nanotubes as counter electrodes for electrochromic devices

Connected displays are the salient nature of our e-connected society requiring high-quality electronic conductive materials integrated in smart devices. Herein, we highlight use carbon nanotubes (CNTs) not only as substitutes for ITO (In2O3:Sn) but mainly a counter electrode electrochromic devices (ECDs). Using dry spinning process, CNT films with directionally oriented tubes were successfully laid on polyethylene terephthalate (PET) flexible substrates. The CNTs synthesized vertically aligned spinnable arrays by chemical vapor deposition. transparency and optical absorption properties tuned adjusting number layers (L) within film from light gray 1L to dark black above 10L. films, showing pseudo-capacitive capacitive behavior lithium-based electrolytes, further ECDs based poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) active layers. fabricated PET/ITO/PEDOT:PSS/electrolyte/CNT/PET device exhibited reproducible clear color switching blue coloration efficiency 88 cm2 C−1. This study highlights novel architecture using CNT-based electrode.