Anion-conductive membranes based on 2-mesityl-benzimidazolium functionalised poly-(2,6-dimethyl-1,4-phenylene oxide) and their use in alkaline water electrolysis
- Anion-conductive membranes based on 2-mesityl-benzimidazolium functionalised poly-(2,6-dimethyl-1,4-phenylene oxide) and their use in alkaline water electrolysis
- 김형준; 장종현; 헨켄스마이어디억; 박현서; 이요나; Izabela Struzynska-Piron; Angela Marinkas; 임아연; Jihyun Kim; Artjom Maljusch; Oliver Conradi
- Anion exchange membrane; 2-Mesityl-benzimidazole; Poly(2,6-dimethyl-1,4-phenylene oxide); Alkaline electrolysis; Alkaline stability
- Issue Date
- VOL 145-251
- For development of anion exchange membrane (AEM) water electrolysis systems, a series of polymers was synthesised by reacting 2-mesityl-benzimidazole (BIM) and brominated poly-(2,6-dimethyl-1,4-phenylene oxide) (Br-PPO) in a Menshutkin reaction, and permethylating the attached BIM groups. The degree of bromination of Br-PPO can be easily monitored by IR spectroscopy: A correlation with the shift of the band around 1190  cm− 1 was found. The IEC values of the prepared materials ranged between 1.6 and 2.9  mmol OH− g− 1. Only materials with an IEC value of 1.9 (PPO24-BIM) reproducibly formed self-supporting membranes. This may be related to the degree of crystallinity, which decreased from 14 to 3% when the IEC increased from 1.6 to 3  1. Materials with IEC values of 1.6 and 2.2 can form self-supporting membranes, but not reproducibly. PPO24-BIM showed a conductivity of 8  mS  cm-1  at room temperature, a thermal stability well above 200  °C, and mechanical properties similar to those of commercial FAA3-30 membranes. During water electrolysis, a current density of 300  mA  cm-2  at 1.8  V was obtained. At 80  °C in 1  M KOH, degradation of BIM and the PPO backbone were observed by IR spectroscopy and monitoring conductivity and weight loss.
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