Aqueous Solar Flow Battery (IMAGE) Ohio State University Caption Prototype aqueous solar flow battery under development at The Ohio State University. The square piece of solar cell (center) is red, because the researchers are using a red dye to tune the wavelength of light it absorbs and converts to electrons. Credit Photo by Kevin Fitzsimons, courtesy of The Ohio State University. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.