Poly(Arylene Alkylene)s with Tetrazole Pendants for Alkaline Ion-Solvating Polymer Electrolytes.
ChemSusChem
; : e202400844, 2024 Aug 08.
Article
en En
| MEDLINE
| ID: mdl-39115117
ABSTRACT
Alkaline ion-solvating membranes derived from a tetrazole functionalized poly(arylene alkylene) are prepared, characterized and evaluated as electrode separators in alkaline water electrolysis. The base polymer, poly[[1,1'-biphenyl]-4,4'-diyl(1,1,1-trifluoropropan-2-yl)], is synthesized by superacid catalyzed polyhydroxyalkylation and subsequently functionalized with tetrazole pendants. After equilibration in aqueous KOH, the relatively acidic tetrazole pendants are deprotonated to form the corresponding potassium tetrazolides. The room temperature ion conductivity is found to peak at 19â
mS cm-1 in 5â
wt. % KOH, and slightly declines with increasing KOH concentration to 13â
mS cm-1 in 30â
wt. % KOH. Based on an overall assessment of the mechanical properties, conductivity and electrode activity, 30â
wt. % KOH is applied for alkaline electrolysis cell tests. Current densities of up to 1000â
mA cm-2 were reached with uncatalyzed Ni-foam electrodes at a cell voltage of less than 2.6â
V, with improved gas barrier characteristics compared to that of the several times thicker Zirfon separator.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
ChemSusChem
Asunto de la revista:
QUIMICA
/
TOXICOLOGIA
Año:
2024
Tipo del documento:
Article
País de afiliación:
Dinamarca