Comparison of Acid and Alkaline Hydrogen-Bromine Fuel Cell Systems

The hydrogen bromine (H2-Br2) fuel cell system is an attractive system for electrical energy storage because of its high round-trip conversion efficiency, high power density capability, and anticipated low costs. The hydrogen-bromine fuel cell system can be operated in the acid or alkaline modes. The charge and discharge electrode reactions in an acid H2-Br2 fuel cell system are as follows: Bromine Electrode: Br2 (aq) + 2eh ←→ h 2Br(aq), E o = +1.09 V