The reversible hydrogen-bromine (H₂-Br₂) redox flow battery has attracted considerable interest lately and is considered to be a suitable candidate for large scale electrical energy storage. In this talk, the fabrication and use of an electrospun nanofiber mat hydrogen electrode in a H₂-Br₂ redox flow battery is described, where the fibers are composed of Pt/C catalyst particles and Nafion binder.  Due to enhanced surface hydrophobicity, there is little or no poisoning of the Pt catalyst by bromine species, resulting in high power generation at a low Pt loading and long cycle life, e.g.,  550 mW/cm² at 0.65 V for a loading of 0.048 mg_Pt/cm² (11.5 kW/g_Pt), with no loss in power for more than 140 charge/discharge cycles.