A simple liquid-based battery containing a methylene blue solution (left side), and a colorless solution of leuco methylene blue (right), which is methylene blue with added electrons.
Credit: Meredith Forrest Kulwicki/University at Buffalo
Methylene blue is a common ingredient in wastewater from textile mills. But scientists think it may be possible to give this industrial pollutant a second life. In a study, they show that the dye, dissolved in water, is good at storing and releasing energy on cue. This makes the compound a promising material for redox flow batteries, which could store energy for wind farms and solar homes.
“Methylene blue is a widely used dye...
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