From hydroxyl group to carbonyl group: Tuning the supercapacitive performance of holey graphene

Xu, Maodan; Wang, Xixin; Li, Ziqing; Yang, Mengyao; Zhao, Jianling

doi:10.1016/j.electacta.2023.143491

Cited by 3 publications

(1 citation statement)

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“…Furthermore, we summarize some recent progress in hG-based supercapacitors in table 2. In comparison to hG supercapacitors constructed by mixed slurry pasted on current collector [45] or rod-coating layer [46] on current collectors (no evident interlayer spacer present), our hG wet films exhibit better capacitive performance. However, when compared to those supercapacitors with assembled 3D structures, e.g.…”

Section: Electrochemical Measurementsmentioning

confidence: 97%

Tuning the water interlayer spacer of microwave-synthesized holey graphene films towards high performance supercapacitor application

Bi,

Jiang,

Sun

et al. 2024

2D Mater.

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Graphene-based electrodes have been extensively investigated for supercapacitor applications. However, their ion diffusion efficiency is often hindered by the graphene restacking phenomenon. Even though holey graphene is fabricated to address this issue by providing ion transport channels, those channels could still be blocked by densely stacked graphene nanosheets. To tackle this challenge, this research aims at improving the ion diffusion efficiency of microwave-synthesized holey graphene films by tuning the water interlayer spacer towards the improved supercapacitor performance. By controlling the vacuum filtration during graphene-based electrode fabrication, we obtain dry films with dense packing and wet films with sparse packing. The SEM images reveal that 20 times larger interlayer distance is constructed in the wet film compared to that in the dry counterpart. The holey graphene wet film delivers a specific capacitance of 239 F/g, ~82% enhancement over the dry film (131 F/g). By an integrated experimental and computational study, we quantitatively show that the interlayer spacing in combination with the nanoholes in the basal plane dominates the ion diffusion rate in holey graphene-based electrodes. Our study concludes that novel hierarchical structures should be further considered even in holey graphene thin films to fully exploit the superior advantages of graphene-based supercapacitors.

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Section: Electrochemical Measurementsmentioning

confidence: 97%