Phosphoric Acid Electrolyte Uptake and Retention Analysis on UiO‐66‐NH2 Polybenzimidazole Nanocomposite Membranes

IF 2.6 4区工程技术 Q3 ELECTROCHEMISTRY

Fuel Cells Pub Date : 2024-06-26 DOI:10.1002/fuce.202400045

Bo Wu, Hui Leng Choo, Wei Keat Ng, Ming Meng Pang, Li Wan Yoon, Wai Yin Wong

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引用次数: 0

Abstract

High‐temperature proton exchange membrane fuel cells (HT‐PEMFCs) have a major advantage over low‐temperature fuel cells due to their better tolerance to higher carbon monoxide content in the hydrogen feed, simpler fuel processing, and better heat management. However, a key challenge in the development of HT‐PEMFCs is the potential for acid leaching from phosphoric acid‐doped polybenzimidazole membranes, which can reduce overall fuel cell performance. This study investigates the effect of post‐synthetic modification of the UiO‐66‐NH2 metal–organic framework (MOF) on the acid electrolyte uptake and retention of MOF/poly(4,4ʹ‐diphenylether‐5,5ʹ‐bibenzimidazole) (OPBI) nanocomposite membranes. Thermogravimetric analysis (TGA) was used to correlate the membrane properties with acid uptake. This work revealed that the presence of MOF with functional groups that can form hydrogen bonds with phosphoric acid molecules was able to alleviate the acid retention in the OPBI membrane with lower acid uptake. TGA demonstrated that the lower bound moisture content in the nanocomposite membranes was correlated to the lower acid uptake. In addition, the thermal stability of the nanocomposite membranes was found to improve.

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UiO-66-NH2 聚苯并咪唑纳米复合膜对磷酸电解质的吸收和截留分析

高温质子交换膜燃料电池（HT-PEMFCs）与低温燃料电池相比具有很大的优势，因为它们能更好地耐受氢原料中较高的一氧化碳含量、更简单的燃料处理和更好的热管理。然而，开发 HT-PEMFCs 的一个主要挑战是掺磷酸的聚苯并咪唑膜可能出现酸浸出，这会降低燃料电池的整体性能。本研究探讨了 UiO-66-NH2 金属有机框架 (MOF) 后合成修饰对 MOF/ 聚（4,4ʹ-二苯醚-5,5ʹ-联苯并咪唑）（OPBI）纳米复合膜的酸电解质吸收和保留的影响。热重分析（TGA）用于将膜特性与酸吸收相关联。研究结果表明，含有能与磷酸分子形成氢键的官能团的 MOF 能够减轻 OPBI 膜的酸滞留，降低酸吸收。热重分析表明，纳米复合膜中较低的结合水分含量与较低的酸吸收率有关。此外，纳米复合膜的热稳定性也有所提高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fuel Cells 工程技术-电化学

CiteScore

5.80

自引率

3.60%

发文量

审稿时长

3.7 months

期刊介绍： This journal is only available online from 2011 onwards. Fuel Cells — From Fundamentals to Systems publishes on all aspects of fuel cells, ranging from their molecular basis to their applications in systems such as power plants, road vehicles and power sources in portables. Fuel Cells is a platform for scientific exchange in a diverse interdisciplinary field. All related work in -chemistry- materials science- physics- chemical engineering- electrical engineering- mechanical engineering- is included. Fuel Cells—From Fundamentals to Systems has an International Editorial Board and Editorial Advisory Board, with each Editor being a renowned expert representing a key discipline in the field from either a distinguished academic institution or one of the globally leading companies. Fuel Cells—From Fundamentals to Systems is designed to meet the needs of scientists and engineers who are actively working in the field. Until now, information on materials, stack technology and system approaches has been dispersed over a number of traditional scientific journals dedicated to classical disciplines such as electrochemistry, materials science or power technology. Fuel Cells—From Fundamentals to Systems concentrates on the publication of peer-reviewed original research papers and reviews.