Issue 37, 2023

The effect of the piperidinium structure on anion-exchange membranes for applications in alkaline water electrolysis cells

Abstract

To evaluate the effect of the piperidinium structure on the properties of anion-exchange membranes, hydrophilic components containing five different piperidinium head groups were designed and combined with hydrophobic components (hexafluoroisopropylidene biphenylene groups) to obtain a series of target copolymers. The effect of CH3– and CF3– substituents was less on the mechanical properties of the copolymer membranes, and more prominent on the hydroxide-ion conductivity and chemical stability in the order of QBP-1 (no substituents) > QBP-2 (with methyl) > QBP-3 (with dimethyl) > QBP-4 (with trifluoromethyl), which was related to the extent of water uptake. QBM-2.7 with ammonium nitrogen at the terminal position of the side chains achieved the highest chemical stability (86% conductivity remaining after a 1000 h stability test in 8 M KOH at 80 °C). A QBM-2.7 membrane was applied to an alkaline water electrolysis cell, which exhibited high current efficiency (76%) and performance (1.62 V at 1.0 A cm−2) and was operable for 1000 h with minor changes in the cell performance.

Graphical abstract: The effect of the piperidinium structure on anion-exchange membranes for applications in alkaline water electrolysis cells

Supplementary files

Article information

Article type
Paper
Submitted
03 Jun 2023
Accepted
30 Aug 2023
First published
30 Aug 2023

J. Mater. Chem. A, 2023,11, 19925-19935

The effect of the piperidinium structure on anion-exchange membranes for applications in alkaline water electrolysis cells

Y. Ozawa, T. Iwataki, M. Uchida, K. Kakinuma and K. Miyatake, J. Mater. Chem. A, 2023, 11, 19925 DOI: 10.1039/D3TA03288D

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