Abstract
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.
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Funding
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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Zhang, C., Zhang, W., Mu, Y. et al. Facile fabrication of holey graphene oxide paper bonded with sulfonic acid for highly efficient proton conduction. Ionics 25, 573–581 (2019). https://doi.org/10.1007/s11581-018-2789-7
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DOI: https://doi.org/10.1007/s11581-018-2789-7