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Electrochromic Prussian Blue

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Uploaded on Mar 1, 2011

Hey, this is a video of an electrochromic device I made for demonstration purposes about a year ago, just two months into my PhD on electrochromic materials.

This device was made as a demonstration tool and is based on Prussian Blue (Iron Hexacyanoferrate). It uses Indium-Tin Oxide (ITO) coated glass as the transparent conductive material onto which the Prussian Blue has been deposited.Potassium Chloride (KCl) in deionised water is the electrolyte and the switching potential is provided by a 1.5v AA size battery.

There are many videos on youtube and websites claiming to show / sell electrochromic devices and windows which actually are suspended particle devices (SPDs) NOT true electrocromic devices! SPDs use similar technology as found in e-ink that you get in the Kindle etc, where as true electrochromic devices are materials which change their absorption (often due to a shift in their bandgap) as a result of undergoing a redox reaction.

I have since made more advanced materials and devices and produced more presentable demonstration devices, however they are confidential at this time as part of my project.

Thanks for watching! :-)

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