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High temperature polymer electrolyte membrane fuel cells with Polybenzimidazole-Ce0.9Gd0.1P2O7 and polybenzimidazole-Ce0.9Gd0.1P2O7-graphite oxide composite electrolytes
Journal of Power Sources ( IF 8.1 ) Pub Date : 2018-09-05 , DOI: 10.1016/j.jpowsour.2018.08.076
Bhupendra Singh , Nitika Devi , Avanish Kumar Srivastava , Rajesh K. Singh , Sun-Ju Song , N. Nambi Krishnan , Anastasiia Konovalova , Dirk Henkensmeier

In this work, polybenzimidazole based composite membranes are fabricated using polybenzimidazole, Ce0.9Gd0.1P2O7 and graphite oxide by solution casting procedure. The microstructural, mechanical and electrical properties of the phosphoric acid-doped composite membranes are characterized for fuel cell applications. Addition of graphite oxide in the composite leads to improvement in homogeneous dispersion of higher amount, 31 wt%, of Ce0.9Gd0.1P2O7. With the increasing amount of Ce0.9Gd0.1P2O7 in the composite membranes the amount of phosphoric acid loading decreases, but the proton conductivity of the composite membrane is higher than that is reported for the phosphoric acid-doped polybenzimidazole membranes. At 180 °C, a maximum conductivity of 182 mS cm−1 for polybenzimidazole/Ce0.9Gd0.1P2O7 membrane with 24 wt% Ce0.9Gd0.1P2O7 and 199 mS cm−1 for polybenzimidazole/Ce0.9Gd0.1P2O7/graphite oxide membrane with 31 wt% Ce0.9Gd0.1P2O7 is observed. The H2-Air fuel cells operating at 160 °C with ∼250 μm thick polybenzimidazole/Ce0.9Gd0.1P2O7 electrolyte shows open circuit voltage of 0.938 V and maximum power density of 255 mW cm−2 with 640 mA cm−2 current at 160 °C whereas the corresponding values with ∼200 μm thick polybenzimidazole/Ce0.9Gd0.1P2O7/graphite oxide membrane are 0.976 V and 307 mW cm−2 with 800 mA cm−2 current, respectively. However, irrespective of the increased conductivity at the higher temperatures, the maximum power density decreases with increasing temperature >160 °C.



中文翻译:

含聚苯并咪唑-Ce 0.9 Gd 0.1 P 2 O 7和聚苯并咪唑-Ce 0.9 Gd 0.1 P 2 O 7-氧化石墨复合电解质的高温聚合物电解质膜燃料电池

在这项工作中,通过溶液浇铸法使用聚苯并咪唑,Ce 0.9 Gd 0.1 P 2 O 7和氧化石墨制备了聚苯并咪唑基复合膜。掺杂磷酸的复合膜的微观结构,机械和电学特性已针对燃料电池应用进行了表征。在复合物中添加氧化石墨导致Ce 0.9 Gd 0.1 P 2 O 7的含量较高,达到31 wt%时,均匀分散性得到改善。随着Ce 0.9 Gd 0.1 P 2 O 7的增加在复合膜中,磷酸负载量减少,但复合膜的质子传导率高于磷酸掺杂的聚苯并咪唑膜的质子传导率。在180°C下,具有24 wt%Ce 0.9 Gd 0.1 P 2 O 7的聚苯并咪唑/ Ce 0.9 Gd 0.1 P 2 O 7膜的最大电导率为182 mS cm -1,而对于聚苯并咪唑/ Ce 0.9 Gd则为199 mS cm -1具有31 wt%的Ce 0.9 Gd 0.1的0.1 P 2 O 7 /氧化石墨膜观察到P 2 O 7。为H 2 -空气燃料电池,在160操作℃用〜250微米厚的聚苯并咪唑/ CE 0.9的Gd 0.1 P 2 ö 7电解质示出开路0.938Ⅴ的电压和255毫瓦厘米的最大功率密度-2与640毫安厘米-在160°C时为2电流,而厚约200μm的聚苯并咪唑/ Ce 0.9 Gd 0.1 P 2 O 7 /氧化石墨膜的相应值为0.976 V和307 mW cm -2(800 mA cm -2)当前。但是,不管在较高温度下电导率增加,最大功率密度都随温度> 160°C的升高而降低。

更新日期:2018-09-05
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