Anhydrous proton conducting composite membranes containing Nafion and triazole modified POSS

Anhydrous proton conducting composite membranes containing Nafion and triazole modified POSS
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含Nafion和三唑改性POSS的无水质子传导复合膜

DOI:
10.1016/j.electacta.2014.10.041
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发表时间:
2014-12
影响因子:
6.6
通讯作者:
Fan D. Y.
Fan D. Y.
中科院分区:
材料科学2区
文献类型:
--
作者:
Lei M.;Wang Y. G.;Zhang F. F.;Huang C.;Xu X.;Zhang R.;Fan D. Y.

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开发在无水条件下具有合理的质子传导率和机械强度的膜电解质对于在高温下操作的质子交换膜燃料电池是非常重要的。将三唑改性的笼型倍半硅氧烷(Tz-POSS)引入到Nafion膜中,由于Tz-POSS在膜中的均匀分布,所形成的复合电解质的力学性能比纯Nafion膜有所提高。所形成的复合膜的无水质子电导率最初随着温度的升高而增加,在140 °C时达到约0.02 Scm-1。随着温度进一步升高至约150 °C,复合膜达到其玻璃化转变点,高于该玻璃化转变点质子传导率急剧降低。由复合膜组装的单电池的性能略微依赖于95 °C下的加湿条件,使用氢气和氧气作为反应气体,在600 mAcm− 2下达到0.45 V。
Development of membrane electrolytes having reasonable proton conductivity and mechanical strength under anhydrous conditions is of great importance for proton exchange membrane fuel cells operated at elevated temperature. With the introduction of triazole modified polyhedral oligomeric silsesquioxanes (Tz-POSS) into Nafion membrane, the formed composite electrolytes exhibit improved mechanical properties compared to pristine Nafion membrane due to the well distribution of Tz-POSS inside the membrane. The anhydrous proton conductivity of the formed composite membranes increases initially with the increase in temperature, reaching about 0.02 Scm−1at 140 °C. With further increase in temperature to about 150 °C, the composite membrane reaches its glass transition point above which the proton conductivity decreases dramatically. The performance of assembled single cell from composite membrane is slightly dependent on humidification conditions at 95 °C, reaching 0.45 V at 600 mAcm−2using hydrogen and oxygen as reaction gases.
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