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铝取代介孔二氧化硅通道嵌入型高温无水质子交换膜燃料电池中的质子传输

Proton Transport in Aluminum-Substituted Mesoporous Silica Channel-Embedded High-Temperature Anhydrous Proton-Exchange Membrane Fuel Cells.

作者信息

Seo Kwangwon, Nam Ki-Ho, Han Haksoo

机构信息

Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-749, Republic of Korea.

出版信息

Sci Rep. 2020 Jun 25;10(1):10352. doi: 10.1038/s41598-020-66935-5.

DOI:10.1038/s41598-020-66935-5
PMID:32587342
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7316861/
Abstract

Polymer composite membrane technology is promising for enhancing the performance of membrane electrode assemblies for high-temperature fuel cells. In this study, we developed a novel anhydrous proton-exchange polybenzimidazole (m-PBI) composite membrane using Al-substituted mesoporous silica (Al-MCM-41) as a proton-carrier support. The surface-substituted Al-MCM-41 formed effective proton-transport pathways via its periodic hexagonal channel and improved the proton conductivity. The proton conductivity of an m-PBI filled with 9 wt.% filler was 0.356 S cm at 160 °C and 0% humidity, representing an increase of 342% compared to that of a pristine m-PBI. Further, the current density at 0.6 V and maximum power density of m-PBI composite membranes were increased to 0.393 A cm and 0.516 W cm, respectively. The enhanced fuel-cell performance was attributed to the proton-transfer channels and HPO reservoirs formed by the mesopores of the Al-MCM-41 shell. The results indicated that Al-MCM-41 is suitable with respect to the hybrid homologues for enhancing the proton transport of the m-PBI membrane.

摘要

聚合物复合膜技术在提高高温燃料电池膜电极组件性能方面具有广阔前景。在本研究中，我们使用铝取代的介孔二氧化硅（Al-MCM-41）作为质子载体支撑体，开发了一种新型无水质子交换聚苯并咪唑（m-PBI）复合膜。表面取代的Al-MCM-41通过其周期性六边形通道形成了有效的质子传输途径，并提高了质子传导率。填充9 wt.%填料的m-PBI在160°C和0%湿度下的质子传导率为0.356 S cm，与原始m-PBI相比提高了342%。此外，m-PBI复合膜在0.6 V时的电流密度和最大功率密度分别提高到0.393 A cm和0.516 W cm。燃料电池性能的提高归因于Al-MCM-41壳层的介孔形成的质子转移通道和HPO储库。结果表明，Al-MCM-41对于增强m-PBI膜的质子传输而言，是一种合适的混合同系物。

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