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journal article·2025-09Open access

Long‐Term, Stable Alkaline Electrolysis with a Durable Crystalline Polybenzimidazole Membrane

Tae Kyung Lee, MinJoong Kim, Hyungkyu Cho, Seungju Lee, Junghwan Kim, Abu Zafar Al Munsur, Byeol‐Nim Lee, Ji Eon Chae, Jonghee Han, Hyun Seo Park, Jong Hyun Jang, Sung Jong Yoo, Sae Yane Peak, So Young Lee, Hyun‐Seok Cho, Soo‐Young Park, Kwang Ho Song, Hyoung‐Juhn Kim

Small· Volume 21· Issue 38
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Abstract

Abstract To overcome the shortcomings of conventional alkaline electrolyzers, polybenzimidazole (PBI) is used to develop novel alkaline electrolysis membranes. In this study, highly crystalline poly(2,2‐ p ‐phenylene‐5,5‐bibenzimidazole) ( p ‐PBI) is synthesized; specifically, the crystallinity of p ‐PBI is increased during in situ membrane fabrication by introducing an innovative yet simple biaxial stretching step. The biaxially stretched p ‐PBI (fe‐ p ‐PBI) exhibits high crystallinity, which directly affects the electrolytic cell performance. fe‐ p ‐PBI is evaluated using platinum‐group metal (PGM) and Ni‐based catalysts for alkaline electrolysis under various KOH solution feed conditions at different temperatures. The PGM and Ni‐based cells exhibit current densities of 4.3 and 0.9 A cm −2 , respectively, at 1.9 V. Further, the electrolysis proceeds without significant damage to the membrane for 900 h at 60 °C. The high crystallinity of fe‐ p ‐PBI contributes to the high performance and long‐term stability of the alkaline electrolyzer, rendering it suitable for use in practical alkaline water electrolysis applications.
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Research context

Energy storageCatalysis & surfaces

OpenAlex topics: Fuel Cells and Related Materials · Advanced battery technologies research · Hydrogen Storage and Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Hydrogen and Fuel Cell Research Center Korea Institute of Science and Technology (KIST) Hwarang‐ro 14‐gil 5, Seongbuk‐gu Seoul 02792 Republic of Korea

Department of Chemical and Biological Engineering Korea University Anam‐ro 145, Seongbuk‐gu Seoul 02841 Republic of Korea

Department of Energy Engineering Korea Institute of Energy Research (KIER) Gajeong‐ro 152, Yuseong‐gu Daejeon 34129 Republic of Korea

Institute for Hydrogen Energy Korea Institute of Energy Technology (KENTECH) 21 Kentech‐gil Naju Jeonnam 58330 Republic of Korea

Department of Mobility Power Research Korea Institute of Machinery & Materials Gajeongbuk‐ro 156, Yuseong‐gu Daejeon 34103 Republic of Korea

Materials Architecturing Research Center Korea Institute of Science and Technology (KIST) Hwarang‐ro 14‐gil 5, Seongbuk‐gu Seoul 02792 Republic of Korea

Chemical and Biomolecular Engineering Department Sogang University 35 Baekbeom‐ro, Mapo‐gu Seoul 04107 Republic of Korea

School of Applied Chemical Engineering Polymeric Nano Materials Laboratory Kyungpook National University Daehak‐ro 80, Buk‐gu Daegu 41566 Republic of Korea

Funding

Ministry of Science and ICT, South Korea

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