Correlation in structure and properties of highly-porous graphene monoliths studied with a thermal treatment method

Shuwen Wang, Aarón Morelos-Gómez, Zhongwei Lei, Mauricio Terrones Maldonado, Kenji Takeuchi, Wataru Sugimoto, Morinobu Endo, Katsumi Kaneko

Research output: Contribution to journalArticle

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Abstract

We prepared high surface area nanoporous graphene by reduction and KOH activation of graphene oxides and then heat-treated the nanoporous graphene up to 3073 K in Ar. The surface area of thus-prepared samples decreased remarkably from 1560 m2 g-1 to 10 m2 g-1 according to the subtracting pore effect (SPE) method. The transmission electron microscopic (TEM), X-ray diffraction (XRD), Raman spectroscopy and N2 adsorption isotherms at 77.4 K clearly illustrate the evolution of morphology, crystallinity and porosity during the graphitization process with increasing the heating temperature. The high temperature treatment shows a clear segregation of the disordered sp3 carbon frames in addition to the growth of graphitic structure in the porous graphene monoliths, although overall changes in properties and structure of porous graphene monoliths with high temperature treatment are similar to those of other porous carbons. The electrical conductivity measurements indicate that heat-treated samples have an imperfect semimetallic property due to the crystallite boundaries. The cyclic voltammograms measurements indicate that the optimized pore size range of nanoporous graphene for specific capacitance with 2 M KCl aqueous solution as electrolyte is of 0.7 nm < w < 2 nm.

Original languageEnglish (US)
Pages (from-to)174-183
Number of pages10
JournalCarbon
Volume96
DOIs
StatePublished - Jan 1 2016

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Graphite
Graphene
Heat treatment
Carbon
Graphitization
Adsorption isotherms
Temperature
Oxides
Electrolytes
Pore size
Raman spectroscopy
Capacitance
Porosity
Chemical activation
Heating
X ray diffraction
Electrons

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

Cite this

Wang, Shuwen ; Morelos-Gómez, Aarón ; Lei, Zhongwei ; Terrones Maldonado, Mauricio ; Takeuchi, Kenji ; Sugimoto, Wataru ; Endo, Morinobu ; Kaneko, Katsumi. / Correlation in structure and properties of highly-porous graphene monoliths studied with a thermal treatment method. In: Carbon. 2016 ; Vol. 96. pp. 174-183.
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Correlation in structure and properties of highly-porous graphene monoliths studied with a thermal treatment method. / Wang, Shuwen; Morelos-Gómez, Aarón; Lei, Zhongwei; Terrones Maldonado, Mauricio; Takeuchi, Kenji; Sugimoto, Wataru; Endo, Morinobu; Kaneko, Katsumi.

In: Carbon, Vol. 96, 01.01.2016, p. 174-183.

Research output: Contribution to journalArticle

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AU - Morelos-Gómez, Aarón

AU - Lei, Zhongwei

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AU - Takeuchi, Kenji

AU - Sugimoto, Wataru

AU - Endo, Morinobu

AU - Kaneko, Katsumi

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N2 - We prepared high surface area nanoporous graphene by reduction and KOH activation of graphene oxides and then heat-treated the nanoporous graphene up to 3073 K in Ar. The surface area of thus-prepared samples decreased remarkably from 1560 m2 g-1 to 10 m2 g-1 according to the subtracting pore effect (SPE) method. The transmission electron microscopic (TEM), X-ray diffraction (XRD), Raman spectroscopy and N2 adsorption isotherms at 77.4 K clearly illustrate the evolution of morphology, crystallinity and porosity during the graphitization process with increasing the heating temperature. The high temperature treatment shows a clear segregation of the disordered sp3 carbon frames in addition to the growth of graphitic structure in the porous graphene monoliths, although overall changes in properties and structure of porous graphene monoliths with high temperature treatment are similar to those of other porous carbons. The electrical conductivity measurements indicate that heat-treated samples have an imperfect semimetallic property due to the crystallite boundaries. The cyclic voltammograms measurements indicate that the optimized pore size range of nanoporous graphene for specific capacitance with 2 M KCl aqueous solution as electrolyte is of 0.7 nm < w < 2 nm.

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