Novel Cobalt Coated Carbon Felt as High Performance Negative Electrode in Sodium Polysulfide/bromine Redox Flow Battery

Abstract

The first use of cobalt coated carbon felt (Co-CF) as high performance negative electrode in sodium polysullfide/bromine battery (PSB) is presented. The Co-CF was prepared by electroless plating and evaluated by polarization tests and cycling experiment in a PSB single cell at room temperature. At current density of 40 mA cm−2, the cathodic overpotential of the Co-CF for polysulfide/sulfide couple was −22 mV. When using Co-CF as negative electrode and CF as positive electrode, an energy efficiency up to 82.4% was achieved.