Most fuel cells in the world today run on hydrogen. However, as the fuel gets more complex, this oxidation process becomes vastly more complicated. Once carbon atoms are in the fuel, carbon monoxide poisoning of typical fuel cell catalysts becomes problematic.
Bromine dissociates in water in the same manner as chlorine, by forming hypobromous acid and the hypobromite ion. Hypobromous acid is a weak acid that partially dissociates to form a hydrogen ion and a hypobromite ion.
The chloramine in your swimming pool is then photosynthesized by ultraviolet light and forms various salts. Hot water can accelerate chemical reactions. Perhaps the gases released by the hot chlorinated water are something you might not want to breath. Also, adding an acid to bleach will release chlorine gas.