Redox flow battery for hydrogen generation

A redox flow battery system, comprising:

• a. A redox flow battery, comprising:
• i. An electrochemical cell having a first compartment containing a positive electrolyte with an electrode at least partially immersed in the positive electrolyte, a second compartment containing a negative electrolyte with an electrode least partially immersed in the negative electrolyte, and a membrane mutually separating the first and second compartments,
• ii. First and second storage tanks for the storage of the positive and negative electrolytes respectively, at different states of charge,
• iii. Pumps to pump the positive and negative electrolytes from the compartments to the storage tanks and from the storage tanks to the compartments,
• iv. A source and inlet of inert gas to deoxygenate the system and stabilise the charged electrolytes;
• b. A first catalytic bed, for oxidatively forming a chemical species from the positive electrolyte, and regeneration of the positive electrolyte for reuse in the redox flow battery;
• c. A second catalytic bed, for the reduction of protons from the negative electrolyte into molecular hydrogen gas, and regeneration of the negative electrolyte for reuse in the redox flow battery;
• and
• d. Valves for directing the electrolytes between different parts of the system.