Nanographene Aerogels: Size Effect of the Precursor Graphene Oxide on Gelation Process and Electrochemical Properties

Akira Kudo; Patrick G. Campbell; Juergen Biener

doi:10.1002/cnma.201700292

Nanographene Aerogels: Size Effect of the Precursor Graphene Oxide on Gelation Process and Electrochemical Properties

Akira Kudo, Patrick G. Campbell, Juergen Biener

Advanced Institute for Materials Research (AIMR)

Lawrence Livermore National Laboratory

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

Improving the electrochemical properties of graphene aerogels (GAs) without doping or making composites is an attractive synthetic strategy. In this work we report some effects of graphene sheet dimensions on the properties of GAs. Nanographene aerogels (nG-AGs) were synthesized using nanographene oxide (nGO) powder with a mean platelet diameter of 90 nm. In-situ Fourier tranformation infrared (FTIR) spectroscopy during gelation revealed a longer fast-gelation regime for nG-AGs than for standard graphene aerogels (stdG-AGs). The surface-area-normalized capacitance of nG-AGs calculated from cyclic voltammetry is 16% higher than that of stdG-AGs, and the onset of hydrogen evolution is observed at a lower over-potential. These observations can be attributed to an increased density of edge sites and defects in nanographene sheets. Our results indicate that the diameter of the precursor graphene sheets can be used as a parameter to optimize the electrochemical properties of GAs depending on the application.

Original language	English
Pages (from-to)	338-342
Number of pages	5
Journal	ChemNanoMat
Volume	4
Issue number	4
DOIs	https://doi.org/10.1002/cnma.201700292
Publication status	Published - 2018 Apr

Keywords

Edge sites
Electrochemistry
Graphene aerogel
in-situ FTIR
Nanographene

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1002/cnma.201700292

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title = "Nanographene Aerogels: Size Effect of the Precursor Graphene Oxide on Gelation Process and Electrochemical Properties",

abstract = "Improving the electrochemical properties of graphene aerogels (GAs) without doping or making composites is an attractive synthetic strategy. In this work we report some effects of graphene sheet dimensions on the properties of GAs. Nanographene aerogels (nG-AGs) were synthesized using nanographene oxide (nGO) powder with a mean platelet diameter of 90 nm. In-situ Fourier tranformation infrared (FTIR) spectroscopy during gelation revealed a longer fast-gelation regime for nG-AGs than for standard graphene aerogels (stdG-AGs). The surface-area-normalized capacitance of nG-AGs calculated from cyclic voltammetry is 16% higher than that of stdG-AGs, and the onset of hydrogen evolution is observed at a lower over-potential. These observations can be attributed to an increased density of edge sites and defects in nanographene sheets. Our results indicate that the diameter of the precursor graphene sheets can be used as a parameter to optimize the electrochemical properties of GAs depending on the application.",

keywords = "Edge sites, Electrochemistry, Graphene aerogel, in-situ FTIR, Nanographene",

author = "Akira Kudo and Campbell, {Patrick G.} and Juergen Biener",

note = "Funding Information: This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. IM release: LLNL-JRNL-737729. Funding was provided by the Lawrence Livermore National Laboratory Directed Research and Development (LDRD) Grant 15-ERD-019. Publisher Copyright: {\textcopyright} 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim",

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AU - Kudo, Akira

AU - Campbell, Patrick G.

AU - Biener, Juergen

N1 - Funding Information: This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. IM release: LLNL-JRNL-737729. Funding was provided by the Lawrence Livermore National Laboratory Directed Research and Development (LDRD) Grant 15-ERD-019. Publisher Copyright: © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

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N2 - Improving the electrochemical properties of graphene aerogels (GAs) without doping or making composites is an attractive synthetic strategy. In this work we report some effects of graphene sheet dimensions on the properties of GAs. Nanographene aerogels (nG-AGs) were synthesized using nanographene oxide (nGO) powder with a mean platelet diameter of 90 nm. In-situ Fourier tranformation infrared (FTIR) spectroscopy during gelation revealed a longer fast-gelation regime for nG-AGs than for standard graphene aerogels (stdG-AGs). The surface-area-normalized capacitance of nG-AGs calculated from cyclic voltammetry is 16% higher than that of stdG-AGs, and the onset of hydrogen evolution is observed at a lower over-potential. These observations can be attributed to an increased density of edge sites and defects in nanographene sheets. Our results indicate that the diameter of the precursor graphene sheets can be used as a parameter to optimize the electrochemical properties of GAs depending on the application.

AB - Improving the electrochemical properties of graphene aerogels (GAs) without doping or making composites is an attractive synthetic strategy. In this work we report some effects of graphene sheet dimensions on the properties of GAs. Nanographene aerogels (nG-AGs) were synthesized using nanographene oxide (nGO) powder with a mean platelet diameter of 90 nm. In-situ Fourier tranformation infrared (FTIR) spectroscopy during gelation revealed a longer fast-gelation regime for nG-AGs than for standard graphene aerogels (stdG-AGs). The surface-area-normalized capacitance of nG-AGs calculated from cyclic voltammetry is 16% higher than that of stdG-AGs, and the onset of hydrogen evolution is observed at a lower over-potential. These observations can be attributed to an increased density of edge sites and defects in nanographene sheets. Our results indicate that the diameter of the precursor graphene sheets can be used as a parameter to optimize the electrochemical properties of GAs depending on the application.

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KW - in-situ FTIR

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Nanographene Aerogels: Size Effect of the Precursor Graphene Oxide on Gelation Process and Electrochemical Properties

Abstract

Keywords

UN SDGs

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