TY - JOUR
T1 - Correlation in structure and properties of highly-porous graphene monoliths studied with a thermal treatment method
AU - Wang, Shuwen
AU - Morelos-Gómez, Aarón
AU - Lei, Zhongwei
AU - Terrones, Mauricio
AU - Takeuchi, Kenji
AU - Sugimoto, Wataru
AU - Endo, Morinobu
AU - Kaneko, Katsumi
N1 - Funding Information:
This work was supported by the Grant-in-Aid for Scientific Research (A) ( 24241038 ) and partial supported by JST CREST “Creation of Innovative Functional Materials with Advanced Properties by Hyper-nano-space Design” and the grant by the Center of Innovation Program from JST .
Publisher Copyright:
© 2015 Elsevier Ltd.
PY - 2016/1
Y1 - 2016/1
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.
AB - 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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U2 - 10.1016/j.carbon.2015.09.017
DO - 10.1016/j.carbon.2015.09.017
M3 - Article
AN - SCOPUS:84947932503
SN - 0008-6223
VL - 96
SP - 174
EP - 183
JO - Carbon
JF - Carbon
ER -