期刊
ELECTROCHIMICA ACTA
卷 379, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2021.138113
关键词
Sulfonated poly (ether ether ketone ketone)s; Polyorganosilicon; Sulfonic groups functionalized graphene oxide; Nanocomposite membrane; Direct methanol fuel cell
资金
- Natural Science Foundation of the Science and Technology Department of Jilin Province [20180101072JC]
- Key Program of the Science and Technology Department of Jilin Province [20180201082SF]
- Scientific research Program of the Education Department of Jilin Province, People's Republic of China
- National Training Programs of Innovation and Entrepreneurship for Undergraduates
The study successfully prepared crosslinked nanocomposite membranes by introducing graphene oxide with various functional groups and polyorganosilicon, improving proton conductivity, methanol resistance, and overall membrane performance. The nanocomposite membrane showed enhanced conductivity, optimal selectivity, and potential as a new alternative to expensive Nafion (R) 117 for DMFC applications.
It is a challenge to simultaneously improve proton conductivity, methanol resistance and physicochemical stability of polymer electrolyte membranes (PEMs) used in direct methanol fuel cell (DMFC). In response to this situation, the crosslinked nanocomposite membranes are prepared by introducing polyorganosilicon with various functional groups and sulfonic groups functionalized graphene oxide (SFGO) to the sulfonated poly (ether ether ketone ketone) in this paper. Based on our knowledge, no such PEM materials have been designed and prepared by this method. Scanning electron microcopy images demonstrate that there are good compatibility and connectivity between the matrix and fillers. The combination of polyorganosilicon and SFGO significantly improves the comprehensive performance of membrane, including mechanical property, dimensional stability, proton conductivity, methanol resistance, selectivity, oxidative and hydrolytic stabilities, cell performance, etc. Especially, the nanocomposite membrane with 3 wt% SFGO shows the highest conductivity (0.074 S cm(-1) at 25 degrees C) and lowest methanol diffusion coefficient (3.56 x 10(-7) cm(2) S-1), which result in the optimal selectivity (2.08 x 10(5) Ss cm(-3)). In addition, the maximum power density (73.76 mW cm(-2)) of the membrane with 3wt% SFGO is higher than that of commercial Nafion (R) 117 (61.59 mW cm(-2)) under identical experimental conditions. These results indicate that the crosslinked nanocomposite membranes will be new alternative to substitute the expensive Nafion (R) 117 for DMFC application. (C) 2021 Elsevier Ltd. All rights reserved.
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