Enabling rechargeable non-aqueous Mg–O2 battery operations with dual redox mediators

Abstract

Dual redox mediators (RMs) were introduced for Mg–O₂ batteries. 1,4-Benzoquinone (BQ) facilitates the discharge with an overpotential reduction of 0.3 V. 5,10,15,20-Tetraphenyl-21H,23H-porphine cobalt(II) (Co(II)TPP) facilitates the recharge with an overpotential decrease of up to 0.3 V. Importantly, the two redox mediators are compatible in the same DMSO-based electrolyte.