Chelate Flow Battery

Does chelation affect redox flow batteries?

The iron–chromium (FeCr) redox flow battery (RFB) was among the first flow batteries to be investigated because of the low cost of the electrolyte and the 1.2 V cell potential. We report the effects of chelation on the solubility and electrochemical properties of the Fe 3+/2+ redox couple.

Are chelates a molecular barrier for high-voltage aqueous batteries?

We anticipate that not only will this approach of utilizing chelates as a molecular barrier provide a general methodology to enable high-voltage aqueous batteries, but this inhibition of hydrogen evolution will carry wider implications for managing water splitting in other electrochemical applications.

Which metal chelates are used in RFB electrolytes?

The use of metal chelates, including those employing chromium9, 10, 11 and iron, 12, 13, 14, 15, 16 has been investigated for RFB electrolytes, enabling the manipulation of redox potential, solubility, and solution electrolyte pH, as well as mitigating membrane crossover.

What is a high voltage aqueous flow battery?

This electrolyte enables two of the highest voltage aqueous flow batteries, which operate at room temperature and near neutral pH with high efficiency and high power density. The widely available metal and chelate materials coupled with the simple electrolyte synthesis provides a compelling pathway for expedited system scale-up.