Synthesis, Characterization, and Thermal and Proton Conductivity Evaluation of 2,5-Polybenzimidazole Composite Membranes

Table 1

Doping density of phosphoric acid in PBI and composite membranes.

	Area	Thickness (m)	Weight before doping (g)	Weight after doping (g)	Amount of doped H3PO4 (g)	H3PO4 doping density (gm^−3)
2,5-PBI	1 cm × 1 cm	86	0.0024	0.0173	0.0149
CM-D	1 cm × 1 cm	51	0.0036	0.0208	0.0172
CM-S	1 cm × 1 cm	82	0.0064	0.0281	0.0217