Triptycene Branched Poly(aryl‐co‐aryl piperidinium) Electrolytes for Alkaline Anion Exchange Membrane Fuel Cells and Water Electrolyzers

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:...

Full description

Saved in:
Bibliographic Details
Published in:Angewandte Chemie International Edition 2024-01, Vol.63 (3), p.e202316697-n/a
Main Authors: Hu, Chuan, Kang, Na Yoon, Kang, Hyun Woo, Lee, Ju Yeon, Zhang, Xiaohua, Lee, Yong Jun, Jung, Seung Won, Park, Jong Hyeong, Kim, Myeong‐Geun, Yoo, Sung Jong, Lee, So Young, Park, Chi Hoon, Lee, Young Moo
Format: Article
Language:English
Subjects:
Anion exchange
Anion Exchange Membrane
Anion exchanging
Aromatic compounds
Branched Polymer
Catalysts
Current density
Decay rate
Dimensional stability
Electrolytes
Electrolytic cells
Energy conversion
Fuel Cells
Fuel technology
Low voltage
Mechanical properties
Membranes
Polymers
Relative humidity
Sodium hydroxide
Triptycene
Water Electrolyzers
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 (193.5 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 1.705 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 0.6 A cm−2 for 500 h with a low voltage decay rate of 46 μV h−1. Importantly, the related AEMWE achieved unprecedented current densities of 16 A cm−2 and 14.17 A cm−2 (@2 V, 80 °C, 1 M NaOH) using precious and non‐precious metal catalysts, respectively. Moreover, the AEMWE can be stably operated under 1.5 A cm−2 at 60 °C for 2000 h. The excellent results suggest that the triptycene‐branched APEs are promising candidates for future AEMFC and AEMWE applications. Three‐dimensional and highly rigid triptycene was applied in poly(fluorene/dibenzyl‐co‐aryl piperidinium) as a branching agent for alkaline exchange polyelectrolytes, which shows excellent conductivity, mechanical properties, anti‐swelling ability, and alkaline stability. The water electrolysis performance reaches current densities of 16 and 14.17 A cm−2 using precious and non‐precious catalysts in anode, respectively.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202316697