Dual Function Metallo–Organic Assemblies for Electrochromic–Hybrid Supercapacitors. Issue 16 (23rd June 2020)

• Record Type: Journal Article
• Authors: Eisenberg, Ofir; Algavi, Yadid M.; Weissman, Haim; Narevicius, Julia; Rybtchinski, Boris; Lahav, Michal; van der Boom, Milko E.
• Is Part Of: Advanced materials interfaces. Volume 7:Issue 16(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-06-23
• Subjects: electrochemistry -- electrochromic -- energy storage -- hybrid supercapacitors -- metallo–organic assemblies; Materials science -- Periodicals; 620.11
• DOI: 10.1002/admi.202000718
• Languages: English
• ISSNs: 2196-7350

Abstract

Abstract: An integrated electrochromic–hybrid supercapacitor (EHSC) is demonstrated; the device's operation (charging–discharging) is indicated by optical changes (from colored to transparent). The heart of the device is an electrochromic metallo–organic layer that functions as both the battery‐type electrode and the charge indicator. The capacitive electrode is a layered composite of multiwalled carbon nanotubes (MWCNTs) and a conductive polymer (poly(3, 4‐ethylenedioxythiophene) polystyrene sulfonate, PEDOT:PSS). The device operates under low potentials (−0.6 to 2 V), displays high energy and power densities (≈2.2 Wh kg −1 and ≈2529 W kg −1 ), a high coulomb efficiency (99%), a short charging time (≈2 s), and a charge retention ( V ½ ) of ≈60 min. Stability, both in color and energy, for more than 1000 consecutive charging–discharging cycles is demonstrated. No significant changes in device temperature are indicated under the operating conditions. The EHSC is wired with a conventional circuit board to be charged and subsequently to operate a diode. The results demonstrate the potential of metallo–organic assemblies for usage in these types of supercapacitors. Abstract : A hybrid supercapacitor where the charging state is indicated by color is demonstrated. The device is based on a molecular network, that functions as both the battery‐type electrode and the charge indicator. A layered composite of multiwalled carbon nanotubes and a conductive polymer functions as the capacitive electrode.