Lee, Tae Kyung Kim, MinJoong Cho, Hyungkyu Lee, Seungju Kim, Junghwan Al Munsur, Abu Zafar Lee, Byeol-Nim Chae, Ji Eon Han, Jonghee Park, Hyun Seo Jang, Jong Hyun Yoo, Sung Jong Peak, Sae Yane Lee, So Young Cho, Hyun-Seok Park, Soo-Young Song, Kwang Ho Kim, Hyoung-Juhn 2025-08-20T06:03:29Z 2025-08-20T06:03:29Z 2025-08-20 2025-09 1613-6810 https://pubs.kist.re.kr/handle/201004/152979 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 degrees 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. English Wiley - V C H Verlag GmbbH & Co. Long-Term, Stable Alkaline Electrolysis with a Durable Crystalline Polybenzimidazole Membrane Article 10.1002/smll.202502810 1 Small, v.21, no.38 Small 21 38 Y scie scopus 001546142800001 2-s2.0-105012598173 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article ANION-EXCHANGE-MEMBRANE WATER ELECTROLYSIS CATALYST PERFORMANCE alkaline electrolysis biaxial stretching membrane electrode assembly non-PGM catalyst polybenzimidazole