Effects of hydrolysis degree on ion-doped anion exchange membranes in direct borohydride fuel cells |
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| Affiliation: | 1. New Energy Materials Research Center, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, PR China;2. School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, PR China;3. Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201203, PR China;1. Institute of Advanced Optical Technologies ? Thermophysical Properties (AOT-TP), Department of Chemical and Biological Engineering (CBI) and Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Paul-Gordan-Straße 8, 91052 Erlangen, Germany;2. Professorship Applied Thermodynamics, Faculty of Mechanical Engineering, Technische Universität Chemnitz, Reichenhainer Straße 70, 09126 Chemnitz, Germany;3. Institute of Chemical Reaction Engineering (CRT), Department of Chemical and Biological Engineering (CBI), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 3a, 91058 Erlangen, Germany;1. Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan;2. Hydrolabo Inc., 3-10-31, Kagamiyama, Higashi-Hiroshima 739-0046, Japan;3. Faculty of Science, University of the Ryukyus, 1 Senbaru, Nishihara-cho, Okinawa 903-0213, Japan;4. Natural Science Centre for Basic Research & Development, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan;1. School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China;2. Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, Guangzhou 510006, China;3. Department of Chemistry, University College London, London WC1H 0AJ, UK;4. Institute of High Performance Computing (IHPC), Agency for Science, Technology and Research (A1STAR), 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632, Republic of Singapore;1. Institute for Plastics Processing (IKV) in Industry and Craft at RWTH Aachen University, RWTH Aachen University, Seffenter Weg 201, 52074 Aachen, Germany;2. ISATEC GmbH Rathausstraße 10, 52072 Aachen, Germany |
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| Abstract: | Herein, polyvinyl alcohol based anion exchange membranes (AEMs) doped with various cobalt and chloride salts are synthesized to investigate the structure-performance relationship of ion-doped AEMs systemically. The performances of ion-doped AEMs are found to be related to the hydrolysis degree (DH) of the doped anions and cations. It is found that cations with varying DH transformed into hydroxides with different sizes and dispersions, which plays a key role in determining the structures and properties of cation-doped AEMs. On the other hand, weak-acid anions remained in the AEMs after alkali immersion, hindering OH? conduction and leading to the degradation of the anion-doped AEMs. High DH cations mildly react with the matrix and transform into more dispersive complexes, while low DH anions are replaced by OH?.The direct borohydride fuel cell using CuCl2-doped AEM exhibits a maximum power density of 202.4 mW cm?2 at 30 °C. |
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| Keywords: | Anion exchange membranes Ion doping Hydrolysis degree Direct borohydride fuel cells |
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