KOH modified Nafion112 membrane for high performance alkaline direct ethanol fuel cell |
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Authors: | Hongying Hou Suli WangWei Jin Qian Jiang Lili Sun Luhua JiangGongquan Sun |
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Affiliation: | a Direct Alcohol Fuel Cells Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China b Graduate School of the Chinese Academy Sciences, Beijing 100039, China |
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Abstract: | A polymer electrolyte membrane for alkaline direct ethanol fuel cell (ADEFC) was prepared by dipping Nafion112 membrane into KOH solution for some time at room temperature. The obtained membrane (Nafion112/KOH) exhibited higher mechanical properties and thermal stability than Nafion112 membrane. The ionic conductivity of Nafion112/KOH in 1 M, 2 M and 6 M KOH solutions was 0.011 S/cm, 0.026 S/cm, 0.032 S/cm, respectively, depending on internal OH− concentration and the volume fraction of the internal aqueous phase. Single cell performance suggested that active ADEFC with Nafion112/KOH membrane can deliver a peak power density of 58.87 mW/cm2 at 90 °C, meanwhile, it can stably run for at least 12 h above 0.2 V. On the other hand, Pt-free air breathing ADEFC with Nafion112/KOH can output a peak power density of 11.5 mW/cm2 at 60 °C, and the corresponding lifetime was as long as 473 h above 0.3 V. |
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Keywords: | Nafion112/KOH Mechanical property Air breathing Alkaline direct ethanol fuel cell (ADEFC) Life time |
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