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Hierarchically Porous Carbon Nanosheets from Waste Coffee Grounds for Supercapacitors

Yun, Young Soo, Park, Min Hong, Hong, Sung Ju, Lee, Min Eui, Park, Yung Woo, Jin, Hyoung-Joon·2015·ACS Applied Materials & Interfaces

Abstract

The nanostructure design of porous carbon-based electrode materials is key to improving the electrochemical performance of supercapacitors. In this study, hierarchically porous carbon nanosheets (HP-CNSs) were fabricated using waste coffee grounds by in situ carbonization and activation processes using KOH. Despite the simple synthesis process, the HP-CNSs had a high aspect ratio nanostructure (∼20 nm thickness to several micrometers in lateral size), a high specific surface area of 1945.7 m(2) g(-1), numerous heteroatoms, and good electrical transport properties, as well as hierarchically porous characteristics (0.5-10 nm in size). HP-CNS-based supercapacitors showed a specific energy of 35.4 Wh kg(-1) at 11250 W kg(-1) and of 23 Wh kg(-1) for a 3 s charge/discharge current rate corresponding to a specific power of 30000 W kg(-1). Additionally, the HP-CNS supercapacitors demonstrated good cyclic performance over 5000 cycles.

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Metadata

Authors
Yun, Y. S., Park, M. H., Hong, S. J., Lee, M. E., Park, Y. W., & Jin, H.-J.
Venue
ACS Applied Materials & Interfaces
Published
2015-02-03
Volume
7
Issue
6
Pages
3684-3690
ISSN
  • 1944-8244 (ISSN-L)
  • 1944-8252
OpenAlex
W1982339938
Cited by
295
References
0
FWCI
11.17
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Hierarchically Porous Carbon Nanosheets from Waste Coffee Grounds for Supercapacitors. https://app.cochat.ai/papers/10.1021/am5081919
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Yun, Y. S., Park, M. H., Hong, S. J., Lee, M. E., Park, Y. W., & Jin, H.-J. (2015). Hierarchically Porous Carbon Nanosheets from Waste Coffee Grounds for Supercapacitors. ACS Applied Materials & Interfaces. https://doi.org/10.1021/am5081919

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