Electrochromic capacitive windows based on all conjugated polymers for a dual function smart window

Younghoon Kim, Minsu Han, Jinbo Kim, Eunkyoung Kim

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

A highly transparent electrochromic capacitive (ECC) window was explored by combining a high contrast electrochromic polymer (ECP) and a transparent capacitive polymer. A blue and a red color ECP, poly(3,3-bis(bromomethyl)-3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepine) (PR-Br) and poly(3,4-di(2-ethylhexyloxy)thiophene-co-3,4-di(methoxy)thiophene) (Th-OR), respectively, were introduced into an ECC window having a thin polyaniline (PANI) film as a capacitive layer. The as prepared ECC window showed high transparency (>72% for PR-Br), large color contrast, and long capacitive stability over 10000 cycles, by combining non-aqueous acidic electrolyte and precise control of each electrode's working potential using in situ potential matching. Upon introducing a dielectric poly(methylmethacrylate) (PMMA) layer, the blue ECC window made of PR-Br and PANI showed bistable ECC properties, along with a high energy density of 9.7 and 13.5 W h kg-1 with a power density of 75.3 and 58.8 kW kg-1, respectively, for bleaching and coloring. The red ECC window made of Th-OR and PANI also showed a high energy density (10.5 W h kg-1). The energy stored in an ECC window could be transferred to another device, like a battery, to switch the color or to light a LED when the ECC window is connected in series. Thus the ECC window in this study functions as a color switching smart window and a rechargeable battery, to provide a new path to achieve energy saving EC windows with multi-color tunability. The working principle of these ECC windows can be widely applied in various electrochemical devices for multiple functions in one device.

Original languageEnglish
Pages (from-to)2124-2133
Number of pages10
JournalEnergy and Environmental Science
Volume11
Issue number8
DOIs
Publication statusPublished - 2018 Aug

Fingerprint

Conjugated polymers
polymer
Color
Polyaniline
Thiophenes
Polymers
Thiophene
Methylmethacrylate
energy
Secondary batteries
Coloring
bleaching
Bleaching
transparency
Transparency
electrolyte
Electrolytes
Light emitting diodes
Energy conservation
electrode

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution

Cite this

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title = "Electrochromic capacitive windows based on all conjugated polymers for a dual function smart window",
abstract = "A highly transparent electrochromic capacitive (ECC) window was explored by combining a high contrast electrochromic polymer (ECP) and a transparent capacitive polymer. A blue and a red color ECP, poly(3,3-bis(bromomethyl)-3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepine) (PR-Br) and poly(3,4-di(2-ethylhexyloxy)thiophene-co-3,4-di(methoxy)thiophene) (Th-OR), respectively, were introduced into an ECC window having a thin polyaniline (PANI) film as a capacitive layer. The as prepared ECC window showed high transparency (>72{\%} for PR-Br), large color contrast, and long capacitive stability over 10000 cycles, by combining non-aqueous acidic electrolyte and precise control of each electrode's working potential using in situ potential matching. Upon introducing a dielectric poly(methylmethacrylate) (PMMA) layer, the blue ECC window made of PR-Br and PANI showed bistable ECC properties, along with a high energy density of 9.7 and 13.5 W h kg-1 with a power density of 75.3 and 58.8 kW kg-1, respectively, for bleaching and coloring. The red ECC window made of Th-OR and PANI also showed a high energy density (10.5 W h kg-1). The energy stored in an ECC window could be transferred to another device, like a battery, to switch the color or to light a LED when the ECC window is connected in series. Thus the ECC window in this study functions as a color switching smart window and a rechargeable battery, to provide a new path to achieve energy saving EC windows with multi-color tunability. The working principle of these ECC windows can be widely applied in various electrochemical devices for multiple functions in one device.",
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Electrochromic capacitive windows based on all conjugated polymers for a dual function smart window. / Kim, Younghoon; Han, Minsu; Kim, Jinbo; Kim, Eunkyoung.

In: Energy and Environmental Science, Vol. 11, No. 8, 08.2018, p. 2124-2133.

Research output: Contribution to journalArticle

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