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Inicio » Actividades I+D > Publicaciones 2016 > Alkali doped poly (2,5-benzimidazole) me...
artículo con referato
"Alkali doped poly (2,5-benzimidazole) membrane for alkaline water electrolysis: Characterization and performance"
Liliana A. Diaz, Jaromír Hnát, Nayra Heredia, Mariano M. Bruno, Federico A. Viva, Martin Paidar, Horacio R. Corti, Karel Bouzek and Graciela C. Abuin
J. Power. Sources. 312 (2016) 128-136
The properties and performance of linear and cross-linked KOH doped ABPBI membranes as electrolyte/separator for zero gap alkaline water electrolysis cells are evaluated and compared with a commercial Zirfon® diaphragm. Stability in alkaline environment, swelling, thermal properties, water sorption, KOH uptake and conductivity of linear (L-ABPBI) and cross-linked (C-ABPBI) membranes doped with different concentrations of KOH are analyzed. Linear membranes show stability up to 3.0 mol·dm-3 KOH doping, while cross-linked membranes are stable up to 4.2 mol·dm-3 KOH doping. Both kinds of membranes exhibit good thermal stability and reasonable specific ionic conductivity at 22°C in the range between 7 and 25 mS·cm-1, being slightly higher the conductivity of C-ABPBI membranes than that of L-ABPBI ones. In short-term electrolysis tests both L-ABPBI and C-ABPBI membranes show better performance than Zirfon diaphragm in the range from 50 to 70°C. A current density of 335 mA·cm-2 at a cell voltage of 2.0 V is attained with C-ABPBI membranes doped in 3 mol·dm-3 KOH at 70°C, a performance comparable with that of commercial units operating at temperatures ca. 80°C and 30 wt% KOH (6.7 mol·dm-3) as electrolyte.
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