Methylene Blue in a High-Performance Hydrogen-Organic Rechargeable Fuel Cell.

A hydrogen-organic hybrid flow battery (FB) has been developed using methylene blue (MB) in an aqueous acid electrolyte with a theoretical positive electrolyte energy storage capacity of 65.4 A h L. MB paired with the versatile H/H redox couple at the negative electrode forms the H-MB rechargeable fuel cell, with no loss in capacity (5 sig.