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Title: Particle size effect in porous film electrodes of ligand-modified graphene for enhanced supercapacitor performance

Abstract

Graphene-based electrodes for high performance supercapacitors are developed by taking advantage of particle size control, large mass loading, and surface functionalization of reduced graphene oxide (rGO) sheets. Two controlled sizes of graphene sheets (100 nm vs. 45 μm average lateral dimensions) were prepared to study two-electrode system performance. The nano-size graphenes led to the formation of mesoporous films, resulting in higher capacitance, better capacitance retension and lower equivalent series resistance (ESR), indicating better surface usability for diffusion and accessibility of electrolyte ions by shortening transport paths (compared with horizontally stacked films from micro-sized graphenes). For studies using an aqueous electrolyte, the maximum specific capacitance of nano-rGO film was 302 F/g (at 1 A/g with 4.3 mg/cm 2 of mass loading), which was ~2.4 times higher than micro-rGO film, and achieved a ~67% reduced ESR. With an organic electrolyte, the nano-rGO delivered ~4.2 times higher capacitance (115 F/g at 2 A/g with 4.3 mg/cm 2), 4.0 times lower IR drops, and an order-of-magnitude lower charge-transfer resistance with an energy density of 18.7 Wh/kg. Finally, the results of this work indicate that the size control of graphene sheet particles for film deposit electrodes can be a simple but effective approach to improvemore » supercapacitor performance.« less

Authors:
 [1];  [2];  [2];  [2];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Georgia Inst. of Technology, Atlanta, GA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Temperature Materials Lab. (HTML)
Sponsoring Org.:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
OSTI Identifier:
1366396
Alternate Identifier(s):
OSTI ID: 1396917
Grant/Contract Number:  
AC05-00OR22725; AR0000303
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Carbon
Additional Journal Information:
Journal Volume: 119; Journal Issue: C; Journal ID: ISSN 0008-6223
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE; nano sized graphene; graphene functionalization; reduced graphene oxide; supercapacitor

Citation Formats

Jang, Gyoung Gug, Song, Bo, Moon, Kyoung-sik, Wong, Ching -Ping, Keum, Jong K., and Hu, Michael Z. Particle size effect in porous film electrodes of ligand-modified graphene for enhanced supercapacitor performance. United States: N. p., 2017. Web. doi:10.1016/j.carbon.2017.04.023.
Jang, Gyoung Gug, Song, Bo, Moon, Kyoung-sik, Wong, Ching -Ping, Keum, Jong K., & Hu, Michael Z. Particle size effect in porous film electrodes of ligand-modified graphene for enhanced supercapacitor performance. United States. https://doi.org/10.1016/j.carbon.2017.04.023
Jang, Gyoung Gug, Song, Bo, Moon, Kyoung-sik, Wong, Ching -Ping, Keum, Jong K., and Hu, Michael Z. Mon . "Particle size effect in porous film electrodes of ligand-modified graphene for enhanced supercapacitor performance". United States. https://doi.org/10.1016/j.carbon.2017.04.023. https://www.osti.gov/servlets/purl/1366396.
@article{osti_1366396,
title = {Particle size effect in porous film electrodes of ligand-modified graphene for enhanced supercapacitor performance},
author = {Jang, Gyoung Gug and Song, Bo and Moon, Kyoung-sik and Wong, Ching -Ping and Keum, Jong K. and Hu, Michael Z.},
abstractNote = {Graphene-based electrodes for high performance supercapacitors are developed by taking advantage of particle size control, large mass loading, and surface functionalization of reduced graphene oxide (rGO) sheets. Two controlled sizes of graphene sheets (100 nm vs. 45 μm average lateral dimensions) were prepared to study two-electrode system performance. The nano-size graphenes led to the formation of mesoporous films, resulting in higher capacitance, better capacitance retension and lower equivalent series resistance (ESR), indicating better surface usability for diffusion and accessibility of electrolyte ions by shortening transport paths (compared with horizontally stacked films from micro-sized graphenes). For studies using an aqueous electrolyte, the maximum specific capacitance of nano-rGO film was 302 F/g (at 1 A/g with 4.3 mg/cm2 of mass loading), which was ~2.4 times higher than micro-rGO film, and achieved a ~67% reduced ESR. With an organic electrolyte, the nano-rGO delivered ~4.2 times higher capacitance (115 F/g at 2 A/g with 4.3 mg/cm2), 4.0 times lower IR drops, and an order-of-magnitude lower charge-transfer resistance with an energy density of 18.7 Wh/kg. Finally, the results of this work indicate that the size control of graphene sheet particles for film deposit electrodes can be a simple but effective approach to improve supercapacitor performance.},
doi = {10.1016/j.carbon.2017.04.023},
url = {https://www.osti.gov/biblio/1366396}, journal = {Carbon},
issn = {0008-6223},
number = C,
volume = 119,
place = {United States},
year = {2017},
month = {4}
}

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Works referencing / citing this record:

Stepwise Reduction of Graphene Oxide (GO) and Its Effects on Chemical and Colloidal Properties
journal, July 2018


Stepwise Reduction of Graphene Oxide (GO) and Its Effects on Chemical and Colloidal Properties
journal, July 2018