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In Situ UV-Vis-NIR Spectroelectrochemistry on Electrochromic Materials
Smart windows, dimmable mirrors, and displays all rely on electrochromic materials, which switch color when you apply a potential. To build better devices, you need to know exactly what’s happening at the molecular level during that switch.
At the Leibniz Institute for Solid State and Materials Research (IFW Dresden), Dr. Evgenia Dmitrieva’s spectroelectrochemistry group teamed up with CIDETEC Technology Centre to study viologens, a well-known family of organic electrochromic compounds. By pairing cyclic voltammetry with UV-VIS-NIR absorption spectroscopy from 200 to 2500 nm, they tracked how charged species form as the potential changes.
The result: a clear picture of which species drive the color in different electrolytes, from violet in PVA-borax gel to a single radical cation in propylene carbonate. They also added ESR spectroscopy to the mix to map out the full reduction mechanism.
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