Novel quaternized carbon dots modified polysulfone-based anion exchange membranes with improved performance |
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Affiliation: | 1. Organic Material Synthesis Laboratory, Department of Chemistry, Incheon National University, Incheon 22012, South Korea;2. Fuel Cell Research Center, Korea Institute of Science and Technology, Seoul 136-791, South Korea;1. School of Chemical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea;2. Department of Chemical Engineering and Materials Science, Ewha Womans University, Seoul 03760, Republic of Korea |
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Abstract: | At present, low conductivity and poor chemical stability are still the biggest challenges in the research on anion exchange membranes (AEMs). Herein, novel nanocomposite AEMs were first constructed by introducing quaternized carbon dots (QCDs) into the imidized polysulfone matrix (Im-PSU). QCDs were synthesized by quaternization of CDs derived from citric acid and ethylenediamine. The physicochemical properties and electrochemical properties of the nanocomposite AEMs were significantly improved due to the introduction of QCDs. It was found that the QCDs can improve the ion transport channel of the nanocomposite AEMs. Compared with pure Im-PSU AEM, the OH? conductivity and physicochemical properties of the nanocomposite membranes were enhanced, and the OH? conductivity of ImPSU-1.0%-QCDs composite membrane can reach 109.3 mS cm?1 at 80 °C, and 61.2% initial OH? conductivity was maintained in 1.0 M NaOH solution for 500 h at 60 °C. Our research proves that the nanofiller with a small size can better improve the performance of composite AEMs, and provide an efficient strategy for future research work in the design and preparation of AEMs. |
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Keywords: | Anion exchange membranes Imidized polysulfone Quaternized carbon dots Nanocomposite Improved properties |
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