redoxflowsystemen

Redox flow systems, often referred to as redox flow batteries, are a type of electrochemical energy storage device. Unlike conventional batteries that store energy in solid electrodes, redox flow systems store energy in liquid electrolytes held in external tanks. These electrolytes contain dissolved active species that undergo reversible reduction-oxidation (redox) reactions at the electrodes.

The core components of a redox flow system include a cell stack, electrolyte tanks, and pumps. The cell stack contains two half-cells separated by an ion-exchange membrane. During charging, electrical energy is used to convert the active species in one electrolyte from a reduced state to an oxidized state, and vice versa in the other electrolyte. During discharge, the reverse chemical reactions occur, releasing electrical energy. The capacity of a redox flow system is determined by the volume of the electrolyte tanks, allowing for independent scaling of power and energy.

Various chemistries are employed in redox flow systems, including vanadium, zinc-bromine, and organic molecules. Vanadium redox flow batteries are one of the most common types, utilizing vanadium ions in different oxidation states. Redox flow systems are particularly well-suited for grid-scale energy storage applications due to their long lifespan, inherent safety, and scalability. They can be used to balance intermittent renewable energy sources like solar and wind power, as well as for grid stabilization and peak shaving. Research continues to focus on improving efficiency, reducing costs, and exploring new electrolyte chemistries.