Facile fabrication of holey graphene oxide paper bonded with sulfonic acid for highly efficient proton conduction
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In this work, a novel holey graphene oxide bonded with sulfonic acid groups (S-HGO) was developed using a facile and eco-friendly strategy: erosion and oxidation of graphene oxide (GO) by H2O2 and sulfonation by 4-benzenediazoniumsulfonate. The freestanding paper fabricated by S-HGO shows a high proton conductivity of 4.97 × 10−2 S cm−1 at 60 °C and 100% relative humidity (RH), which is comparable to Nafion 115 (7.67 × 10−2 S cm−1) at the same condition. The holes on S-HGO provide shortcut channels for proton transfer across the GO nanosheet. The chemical-linked sulfonic acid groups afford additional hop sites for proton conduction and endow itself an enhanced thermostability. Under 100% RH and ambient pressure, the freestanding S-HGO deliver a peak power density of 103 mW cm−2 at a load current density of 273 mA cm−2, which is about three times more than that of GO at 35 °C. The results demonstrate that this S-HGO paper is a promising nanoscale inorganic material for proton exchange membranes.
KeywordsHoley Sulfonation Graphene oxide Proton exchange membrane
This work was supported by the National Natural Science Foundation of China (11705126) and Science and Technology Program of Tianjin (16JCQNIC06000 and 16JCYBJC21100).
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