Poly(aryl piperidinium)‐Based AEMs Utilizing Spirobifluorene as a Branching Agent

Author:

Ryoo Geun Woong1ORCID,Shin Sang‐Hun2,Song In Wook1,Lim Jiheon13,Shin Hosun34,Kwon Ki Chang34,Park Sun Hwa34,Lee Jang Yong5ORCID,Kwon Min Sang1ORCID

Affiliation:

1. Department of Materials Science and Engineering Research Institute of Advanced Materials Seoul National University Seoul 08826 Republic of Korea

2. Energy Materials Research Center Korea Research Institute of Chemical Technology (KRICT) Daejeon 34114 Republic of Korea

3. Division of Chemical and Material Metrology Korea Research Institute of Standards and Science (KRISS) Daejeon 34113 Republic of Korea

4. Applied Measurement Science University of Science and Technology Daejeon 34113 Republic of Korea

5. Department of Chemical Engineering Konkuk University Seoul 05029 Republic of Korea

Abstract

AbstractThe high‐performance anion exchange membranes (AEMs) are developed by incorporating 9,9′‐spirobifluorene as a 3D branching agent, addressing the common trade‐off between ion conductivity and dimensional/mechanical stability. By fine‐tuning the ratio of terphenyl to biphenyl and the amount of the branching agent, the AEM is refined, achieving high conductivity (≈190 mS cm−1 at 80 °C in 1 m KOH) with decent dimensional/mechanical properties, comparable to the recently reported state‐of‐the‐art membranes. Investigations using gas pycnometer and atomic force microscopy demonstrated that spirobifluorene enhances the fractional free volume around the membrane's backbone and more precisely modulates the separation between hydrophobic and hydrophilic domains, thus boosting both ion conductivity and mechanical stability. This membrane also displayed excellent chemical stability, with negligible degradation at 80 °C in 1 m KOH over 1,000 h. With such a membrane, an excellent cell performance is achieved, with a current density of 11.2 A cm2 at 80 °C and 2 V in 1 m KOH, and 1.8 A cm2 at 80 °C and 2 V in pure water conditions. The in situ membrane stability test, conducted at a constant current density of 1 A cm2 for 500 h, showed no significant degradation.

Funder

Ministry of Science and ICT, South Korea

Korea Research Institute of Standards and Science

Publisher

Wiley

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