期刊
ELECTROCHIMICA ACTA
卷 260, 期 -, 页码 92-100出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.11.047
关键词
Carbon dots; Nafion; Multi-functional groups; Proton exchange membrane
资金
- Ministry of Science & Technology of China [2016YFA0203302]
- DMFC
It is of great necessity to achieve a proton exchange membrane (PEM) with high proton conductivity and low methanol permeability for the practical applications. Nafion modified carbon dots (NCDs) with multi-functional groups were successfully synthesized via the pyrolysis of citric acid (CA) with the existence of Nafion. The modification process is motivated by the hydrophilicity-to-hydrophobicity transformation of CA as well as the non-covalent hydrophilic-hydrophobic interaction during the pyrolysis procedure. Multi-functionalized NCDs with moderate hydrophilicity influence the aggregation structure of Nafion matrix of the composite membranes and effectively enhance the high-temperature water retention ability. Both the proton conductivity and the methanol resistance ability of the composite PEMs are significantly enhanced. 0.5-NCD-0.5 Nafion composite PEM presents a 5-10 times increase in proton conductivity and 50% percent decrease in methanol permeability than that of recast Nafion. (c) 2017 Elsevier Ltd. All rights reserved.
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