A Redox-Flow Electrochromic Window

A low-cost electrochromic (EC) window based on a redox-flow system that does not require expensive transparent conductive oxide (TCO) substrates is introduced and demonstrated for the first time. An aqueous I-3/I redox electrolyte is used in place of a TCO to oxidize/reduce a molecular layer of an EC triphenylamine derivative that is anchored to a mesoporous TiO2 scaffold on the inner faces of a double-paned window. The redox electrolyte is electrochemically oxidized/reduced in an external two-compartment cell and circulated through the window cavity using an inexpensive peristaltic pump, resulting in coloration or decoloration of the window due to reaction of the redox solution with the triphenylamine derivative. The absorption characteristics, coloration/decoloration times, and cycling stability of the prototype EC window are evaluated, and prospects for further development are discussed.


Published in:
Acs Applied Materials & Interfaces, 7, 4, 2827-2832
Year:
2015
Publisher:
Washington, Amer Chemical Soc
ISSN:
1944-8244
Keywords:
Laboratories:




 Record created 2015-05-29, last modified 2018-09-13


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