... cm -2 jOL,air / mA cm -2 Rmt / ohm cm 2 10 1,418.9 9 52. 8 0.744 20 1 ,27 2.1 786.6 1.041 40 1, 029 .8 5 62. 2 1.5 02 Table 2. Limiting current densities for oxygen and air operation, and ... stoichometry at 1 A cm -2 = 1,5, (b) Air stoichometry at 1 A cm -2 = 4 PTFE content / % jOL,oxygen / mA cm -2 jOL,air / mA cm -2 Rmt / ohm cm 2 Without MPL 1,418.9 9 52. 8 0.744 10 1,477.6 ... 10 1,477.6 1,115.4 0.430 20 1,400.5 1,005.1 0. 622 40 1, 320 .7 922 .5 0.761 60 1 ,24 0 .2 790.3 0.995 Table 5. Limiting current densities for oxygen and air operation, and the mass transfer resistance...