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首页> 外文期刊>Nanotechnology >Synthesis and evaluation of HfO2 as a prospective filler in inorganic-organic hybrid membranes based on Nafion for PEM fuel cells
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Synthesis and evaluation of HfO2 as a prospective filler in inorganic-organic hybrid membranes based on Nafion for PEM fuel cells

机译：基于PEM燃料电池NAFION的无机 - 有机杂交膜中作为预期填料的合成与评价

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Hybrid inorganic-organic Nafion membranes modified with metal oxides (typically TiO2, ZrO2, WO3) are a good alternative for fuel cell applications. However, one of their main limitations is associated with their relative low proton conductivity at temperatures above 80 degrees C. In this work, we overcome this issue using HfO2 as a filler. HfO2 was prepared by a sol-gel method, and it was compared with a recast Nafion membrane (named as recast). Deconvolved XPS spectra confirmed the presence of hafnia, while EDS analysis was used to determine its weight content resulting in a 1.88 wt%. FT-IR ATR experiments indicated that the HfO2 hybrid membrane possess a higher capability to retain water than the recast. Thus, the water uptake, swelling degree, conductivity tests and fuel cell evaluations were performed. The water uptake analysis revealed that the hybrid membrane presented a higher retention percentage at 100 degrees C (61%) than recast (29%). This improvement enabled a higher ionic conductivity at 80 degrees C and 100 degrees C. The hybrid membrane displayed a higher conductivity at 100 degrees C than the recast membrane (112 versus 82 mS cm(-1)), increasing the cell performance to 0.36 W cm(-2); being this performance almost two-fold higher to that obtained for the recast membrane. In summary, herein we demonstrated that HfO2 can be considered as an excellent substitute to conventional fillers.
机译：用金属氧化物（通常是TiO 2，ZrO2，WO3）改性的杂化无机 - 有机Nafion膜是燃料电池应用的替代方案。然而，它们的主要限制之一与它们在80摄氏度高于80℃的温度下的相对低质子电导率相关。在这项工作中，我们使用HFO2作为填料来克服这个问题。通过溶胶 - 凝胶法制备HFO 2，与素质膜（命名为重量）进行比较。 Deconvolved XPS光谱证实了Hafnia的存在，而EDS分析用于确定其重量含量，得到1.88wt％。 FT-IR ATR实验表明HFO2杂化膜具有更高的保留水的能力而不是重组。因此，进行了水吸收，溶胀度，导电性试验和燃料电池评估。水吸收分析显示，杂化膜在100℃（61％）的较高保留百分比（61％），而不是重量（29％）。该改进使得在80℃和100摄氏度下使得较高的离子电导率。杂化膜在100℃下显示比恢复膜（112对82ms（-1））在100摄氏度下显示出更高的电导率，使电池性能增加到0.36W cm（-2）;这种性能几乎高于恢复膜获得的差异。总之，在本文中，我们证明了HFO 2可以被认为是常规填料的优异替代品。

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