US 12,227,858 B2
Polybenzimidazole-based electrolyte membrane for alkaline water electrolysis and water electrolysis device comprising the same
Hyoung-Juhn Kim, Seoul (KR); Taekyung Lee, Seoul (KR); So Young Lee, Seoul (KR); Hee-Young Park, Seoul (KR); Bora Seo, Seoul (KR); Hyun Seo Park, Seoul (KR); Jong Hyun Jang, Seoul (KR); and Tae Hoon Lim, Seoul (KR)
Assigned to Korea Institute of Science and Technology, Seoul (KR)
Filed by KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY, Seoul (KR)
Filed on Jan. 31, 2022, as Appl. No. 17/589,466.
Claims priority of application No. 10-2021-0014726 (KR), filed on Feb. 2, 2021.
Prior Publication US 2022/0243345 A1, Aug. 4, 2022
Int. Cl. C25B 13/08 (2006.01); C25B 1/04 (2021.01)
CPC C25B 13/08 (2013.01) [C25B 1/04 (2013.01)] 9 Claims
 
1. A polymer electrolyte membrane for alkaline water electrolysis which comprises a polybenzimidazole-based polymer, wherein the polybenzimidazole-based polymer is a biaxially oriented film; and
wherein the polybenzimidazole-based polymer is represented by any one of the following Structural Formula 2 to Structural Formula 4:

OG Complex Work Unit Chemistry
In Structural Formula 2 to Structural Formula 4,
each of R1 and R2 independently represents H, —SO3H, or a substituted or non-substituted C1-C30 alkyl group;
each of m1 and m2 independently represents the number of a repeating unit which is an integer of 1-3; and
each of n1 to n4 independently represents the number of a repeating unit, and each repeating unit has a number average molecular weight (Mn) of 5,000-50,000.