A display device having a plurality of light-emitting elements that construct picture elements aligned on a substrate in a formation of a matrix. 40 Wm2 at 420 nanometres on the surface of the moulding, a black standard temperature of 100\xb0 C. The cell further includes a catch tray containing catalyst material to induce the ionization of precipitates of fuel andor fuel additives that may separate in solid form from the fuel electrode.