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Novel silica/poly(2,6-dimethyl-1,4-phenylene oxide) hybrid anion-exchange membranes for alkaline fuel cells: Effect of silica content and the single cell performance |
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| Authors: | Yonghui Wu John R. Varcoe Tongwen Xu Yanxun Fu |
| Affiliation: | a CAS Key Laboratory of Soft Matter Chemistry, Laboratory of Functional Membranes, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui 230026, PR China b School of Chemical Engineering, Hefei University of Technology, Hefei, Anhui 230009, PR China c Chemical Sciences, The University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom |
| Abstract: | Poly(2,6-dimethyl-1,4-phenylene oxide) (PPO)-based organic-inorganic hybrid alkaline membranes with enhanced hydroxyl (OH−) conductivity are prepared in response to the relatively low conductivity of previously reported PPO-based systems. The membranes also exhibit higher swelling-resistant properties and the hydroxyl (OH−) conductivity values are comparable to previously reported fluoropolymer-containing membranes: 0.012-0.035 S cm−1 in the temperature range 30-90 °C. Other favorable properties for fuel cell application include high tensile strengths up to 25 MPa and large ion-exchange capacities in the range 2.01-2.27 mmol g−1. Beginning-of-life fuel cell testing of a membrane with a thickness of 140 μm yielded an acceptable H2/O2 peak power density of 32 mW cm−2 when incorporated into an alkaline membrane electrode assembly. Therefore, this class of hybrid membrane is suitable for application in alkaline membrane fuel cells. |
| Keywords: | Poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) Organic-inorganic hybrid membranes Anion-exchange membranes (AEMs) Alkaline membrane fuel cell (AMFC) |
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