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Effect of Pore Former on Carbon Black–Polytetrafluoroethylene‐Based Monolithic Gas Diffusion Media for Proton Exchange Membrane Fuel Cells
Energy Technology ( IF 3.6 ) Pub Date : 2020-05-01 , DOI: 10.1002/ente.202000119 Sruthi Kattamanchi 1 , Karthik Palakurthi 1 , Prathap Haridoss 1
Energy Technology ( IF 3.6 ) Pub Date : 2020-05-01 , DOI: 10.1002/ente.202000119 Sruthi Kattamanchi 1 , Karthik Palakurthi 1 , Prathap Haridoss 1
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Herein, carbon fiber gas diffusion media are replaced by carbon black (CB) and polytetrafluoroethylene (PTFE) composite diffusion media. Uniformly thick monolithic layers are synthesized by a novel die‐cast process. They are evaluated for electrical conductivity, contact resistance, hydrophobicity, porosity, and mechanical integrity. Monolithic layers possess combined properties of a microporous layer and gas diffusion layer with a mixed tri‐modal pore structure. The monolithic layers are further improved by inducing pores with pore formers. These layers are characterized for use in proton exchange membrane fuel cells. Pore formers increase the porosity and pore volume, and their effects on performance are revealed. The effect of porous structure on catalyst utilization is assessed by cyclic voltammetry. The power density of monolithic layers is on par with standard layers, whereas the pore‐induced monolithic layers achieve 27% higher power density compared with standard layers. The synthesized composite gas diffusion media are significantly insensitive to changes in humidity and represent an excellent alternative for use in fuel cells.
中文翻译：
孔隙形式对质子交换膜燃料电池基于炭黑-聚四氟乙烯的整体式气体扩散介质的影响
在此，碳纤维气体扩散介质被炭黑（CB）和聚四氟乙烯（PTFE）复合扩散介质代替。通过新颖的压铸工艺合成均匀厚的整体层。对它们的导电性，接触电阻，疏水性，孔隙率和机械完整性进行了评估。整体层具有混合的三峰孔隙结构的微孔层和气体扩散层的组合特性。通过用成孔剂诱导孔来进一步改善整体层。这些层的特征在于用于质子交换膜燃料电池。成孔剂增加了孔隙率和孔体积，并且揭示了它们对性能的影响。通过循环伏安法评估多孔结构对催化剂利用率的影响。整体层的功率密度与标准层相当，而孔隙诱导的整体层的功率密度比标准层高27％。合成的复合气体扩散介质对湿度的变化不敏感，是燃料电池的绝佳替代品。
更新日期：2020-07-02
中文翻译：
孔隙形式对质子交换膜燃料电池基于炭黑-聚四氟乙烯的整体式气体扩散介质的影响
在此，碳纤维气体扩散介质被炭黑（CB）和聚四氟乙烯（PTFE）复合扩散介质代替。通过新颖的压铸工艺合成均匀厚的整体层。对它们的导电性，接触电阻，疏水性，孔隙率和机械完整性进行了评估。整体层具有混合的三峰孔隙结构的微孔层和气体扩散层的组合特性。通过用成孔剂诱导孔来进一步改善整体层。这些层的特征在于用于质子交换膜燃料电池。成孔剂增加了孔隙率和孔体积，并且揭示了它们对性能的影响。通过循环伏安法评估多孔结构对催化剂利用率的影响。整体层的功率密度与标准层相当，而孔隙诱导的整体层的功率密度比标准层高27％。合成的复合气体扩散介质对湿度的变化不敏感，是燃料电池的绝佳替代品。
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