shown in Figure . The temperature-resolved measurements were carried out on a different batch compared to the room temperature measurement series, which explains the small variations in the low temperature range. For the STz25 membrane, the conductivity increased from 39 mS cm -1 at 25 ℃ to 92 mS cm -1 at 80 ℃. Similarly, for STz30, a slight temperature increase from 25 to 40 ℃ resulted in a conductivity increase from 77 to 105 mS cm -1 . When the temperature reached 60 ℃, the STz30 membrane suffered from mechanical failure due to plasticization caused by excessive electrolyte uptake (see Figure ).