Improved conductivity and stability of anion exchange membrane modified with bi-phenylguanidinium bridged silsesquioxane
| Autor: | Shoutao Gong, Fengxiang Zhang, Lingdong Li, Li Shanshan, Jie Cheng, Li Xiaoliang, Liu Yanxiang, Gaohong He |
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| Rok vydání: | 2017 |
| Předmět: |
Ion exchange
Renewable Energy Sustainability and the Environment Inorganic chemistry Energy Engineering and Power Technology 02 engineering and technology Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Silsesquioxane 0104 chemical sciences chemistry.chemical_compound Fuel Technology Membrane chemistry Polymerization Hofmann elimination Hydroxide Polysulfone 0210 nano-technology |
| Zdroj: | International Journal of Hydrogen Energy. 42:21016-21026 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2017.07.081 |
| Popis: | This work reports the design, fabrication and properties of 4,4′-oxydiphenylguanidinium-bridged-silsesquioxane (ODGBS) modified polysulfone anion exchange membrane (AEM). It was prepared by sol-gel polymerization of ODGBS in the network of cross-linked, quaternized polysulfone. With hydrophilic biphenylguanidinium and Si O Si moieties working synergistically, the ODGBS derived gel functions as a water “reservoir” in the membrane and thus gives rise to high water uptake, which facilitates hydroxide ion transport via a vehicular mechanism. High water uptake may also “dilute” hydroxide ion at the vicinity of cations and lessen the hydroxide attack on cations. Moreover, ODGBS does not contain β hydrogen atoms, thus reducing the likelihood of Hofmann elimination under hydroxide attack. Due to the above benefits, ODGBS modified AEM could exhibit an improved conductivity from 19 to 25 mS/cm2 at 30 °C, and a conductivity retention of 85% when treated in 1 M NaOH at 60 °C for 120 h, higher than that of the un-modified AEM (72%). This work provides a new strategy for enhancing stability and conductivity of AEM. |
| Databáze: | OpenAIRE |
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