Anion-conductive membranes based on 2-mesityl-benzimidazolium functionalised poly(2,6-dimethyl-1,4-phenylene oxide) and their use in alkaline water electrolysis
| Autor: | Dirk Henkensmeier, Ahyoun Lim, Artjom Maljusch, Hyun S. Park, Hyoung-Juhn Kim, Yona Lee, Angela Marinkas, Oliver Conradi, Jihyun Kim, Jong Hyun Jang, Izabela Struźyńska-Piron |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Polymers and Plastics Electrolysis of water Organic Chemistry Alkaline water electrolysis Inorganic chemistry Menshutkin reaction Oxide 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Crystallinity chemistry.chemical_compound Membrane chemistry Phenylene Materials Chemistry Thermal stability 0210 nano-technology |
| Zdroj: | Polymer. 145:242-251 |
| ISSN: | 0032-3861 |
| DOI: | 10.1016/j.polymer.2018.05.008 |
| Popis: | 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 mmol OH− g−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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect