A novel composite Nafion membrane for direct alcohol fuel cells
A novel composite Nafion membrane for direct alcohol fuel cells
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DOI：
10.1016/j.memsci.2008.11.009
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发表时间：
2009-01
影响因子：
9.5
通讯作者：
L. Barbora;S. Acharya;R. Singh;K. Scott;Anil Verma
中科院分区：
文献类型：
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作者：
L. Barbora;S. Acharya;R. Singh;K. Scott;Anil Verma
三氟甲磺酸或三氟甲磺酸，化学式CF 3SO 3 H，被认为是最强的酸之一，结构类似于Nafion®。三氟甲磺酸铒是三氟甲磺酸的镧盐，是热稳定的。本文报道了通过将三氟甲磺酸铒盐（ErTfO）固定到Nafion结构中形成膜的数据。五种不同的负载量的ErTfO用于制造ErTfO/Nafion复合膜和这些进行了表征，广泛用于直接醇燃料电池的可能性。采用XRD、TGA、FTIR、机械强度、吸水率、离子交换容量、醇吸收率、溶胀率、质子传导率、醇渗透率和氧稳定性对膜进行了表征。ErTfO/Nafion复合膜可使酒精渗透率降低77- 80%。3%ErTfO/Nafion复合膜的质子传导率比纯铸态Nafion膜的质子传导率高38%。ErTfO/Nafion复合膜的氧稳定性高于纯铸态Nafion膜。然而，7%和9%的ErTfO/Nafion的机械强度低于纯铸造的Nafion。该复合膜化学性质稳定，具有直接醇类燃料电池的应用潜力。
Trifluoromethanesulfonic acid or triflate acid, chemical formula CF3SO3H, is regarded as one of the strongest acids and resembles Nafion®in structure. Erbium triflate, a lanthanum salt of triflate, is thermally stable. This paper reports data on the formation of membranes by the fixation of erbium triflate salts (ErTfO) into the Nafion structure. Five different loadings of ErTfO were used to fabricate ErTfO/Nafion composite membranes and these were characterized, extensively for possible use in direct alcohol fuel cells. The membranes were characterized using XRD, TGA, FTIR, and for mechanical strength, water uptake, ion exchange capacity, alcohol uptake, swelling, proton conductivity, alcohol permeability and oxygen stability. The ErTfO/Nafion composite membranes reduced alcohol permeability by 77–80%. The proton conductivity of 3% ErTfO/Nafion composite membranes was 38% higher than that of a pure cast Nafion membrane. The oxygen stability of the ErTfO/Nafion composite membranes was higher than pure cast Nafion. However, the mechanical strength of 7% and 9% ErTfO/Nafion was lower than that of pure cast Nafion. The composite membrane was chemically stable and has potential for use in direct alcohol fuel cells.