Figure 2.

(a) Homogenous solution polymerization of common PBI derivatives. (b) Summary of HT-PEM fuel cell durability data recorded at 150-160°C and 200 mA cm⁻² reported by Oono et al. [55, 56], Pingitore et al. [57], and Sondergaard et al. [58]. The reader is referred to the cited references for further details about the MEA components and test conditions.