Nanocomposite membranes of polybenzimidazole and amine-functionalized carbon nanofibers for high temperature proton exchange membrane fuel cells

Li Cheng Jheng, Afira Ainur Rosidah, Steve Lien Chung Hsu, Ko Shan Ho, Chun Jern Pan, Cheng Wei Cheng

研究成果: Article同行評審

16 引文 斯高帕斯(Scopus)

摘要

Carbon nanofibers functionalized with aminobenzoyl groups (CNF-aminobenzoyl) were preparedviadirect Friedel-Crafts acylation in polyphosphoric acid. The functionalization of CNFs was characterized using XPS, FTIR, TGA, and Raman analyses. Hexafluoroisopropylidene-containing polybenzimidazole (6FPBI) composite membranes containing pristine CNFs or CNF-aminobenzoyl were prepared using solvent-assisted dispersion and solvent-casting methods. In this work, the influence of the incorporation of functionalized CNFs on several physicochemical properties of the 6FPBI nanocomposite membranes, including their thermal stability, mechanical strength, and acid doping level, was studied. The results showed that CNF-aminobenzoyl provided better mechanical reinforcement for the nanocomposite membrane, compared to pristine CNF. The SEM observation confirmed the good compatibility between the CNF-aminobenzoyl fillers and the 6FPBI matrix. For the 0.3 wt% CNF-aminobenzoyl/6FPBI composite membrane, the tensile stress was increased by 12% to be 78.9 MPa (as compared to the 6FPBI membrane), the acid doping level was improved to 12.0, and the proton conductivity at 160 °C was measured above 0.2 S cm−1. Furthermore, the fuel cell performance of the membrane electrolyte assembly (MEA) for each nanocomposite membrane was evaluated. The maximum power density at 160 °C was found up to 461 mW cm−2for the MEA based on the 0.3 wt% CNF-aminobenzoyl/6FPBI composite membrane.

原文English
頁(從 - 到)9964-9976
頁數13
期刊RSC Advances
11
發行號17
DOIs
出版狀態Published - 2021 3月 3

All Science Journal Classification (ASJC) codes

  • 一般化學
  • 一般化學工程

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