Triptycene Branched Poly(aryl-co-aryl piperidinium) Electrolytes for Alkaline Anion Exchange Membrane Fuel Cells and Water Electrolyzers.
Angew Chem Int Ed Engl
; 63(3): e202316697, 2024 Jan 15.
Article
en En
| MEDLINE
| ID: mdl-38063325
ABSTRACT
Alkaline polymer electrolytes (APEs) are essential materials for alkaline energy conversion devices such as anion exchange membrane fuel cells (AEMFCs) and water electrolyzers (AEMWEs). Here, we report a series of branched poly(aryl-co-aryl piperidinium) with different branching agents (triptycene highly-rigid, three-dimensional structure; triphenylbenzene planar, two-dimensional structure) for high-performance APEs. Among them, triptycene branched APEs showed excellent hydroxide conductivity (193.5â
mS cm-1 @80 °C), alkaline stability, mechanical properties, and dimensional stability due to the formation of branched network structures, and increased free volume. AEMFCs based on triptycene-branched APEs reached promising peak power densities of 2.503 and 1.705â
W cm-2 at 75/100 % and 30/30 % (anode/cathode) relative humidity, respectively. In addition, the fuel cells can run stably at a current density of 0.6â
A cm-2 for 500â
h with a low voltage decay rate of 46â
µV h-1 . Importantly, the related AEMWE achieved unprecedented current densities of 16â
A cm-2 and 14.17â
A cm-2 (@2â
V, 80 °C, 1â
M NaOH) using precious and non-precious metal catalysts, respectively. Moreover, the AEMWE can be stably operated under 1.5â
A cm-2 at 60 °C for 2000â
h. The excellent results suggest that the triptycene-branched APEs are promising candidates for future AEMFC and AEMWE applications.
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Año:
2024
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