At present, we are in the process of commercializing a technology that stabilizes carbon electrode surfaces in redox flow batteries (RFBs). For a variety of RFB chemistries oxidative degradation of the carbon electrodes is a known problem resulting in loss of capacity and early reactor stack replacement.
Our technology protects the electrode surface to oxidative damage during battery cycling without sacrificing its electrocatalytic activity. Laboratory results using zinc-bromine RFB chemistry show that this enables flow battery reactors to operate up to 5 times longer with virtually no loss of catalytic capacity. The technology is currently being validated for other RFBs, including all-vanadium systems.
The electrode stabilization is provided via simple aqueous chemical treatment of the carbon surface, and could be incorporated into the manufacturing chain either before reactor assembly, or potentially afterwards, allowing one to treat already assembled systems.