Nafion Modified Graphene Aerogel with Hierarchical Porous Structures

doi:10.15541/jim20170165

Abstract

Abstract:

A novel graphene aerogel with pore size less than 1 µm was synthesized by Sol-Gel method, in which Nafion was skillfully introduced as modifiers connecting graphene oxides (GO). Ethylenediamine was used to produce a chemically linked graphene hydrogel during reducing process, which can then be freeze-dried to remove the absorbed water to form graphene aerogel. Nafion in GO solution prohibits the re-stacking of individual graphene sheets during reduction and freeze-drying process. By the above method, the pore size of as-prepared graphene aerogel could be effectively controlled within 1 µm, much less than that of the traditional graphene aerogel (20- 100 µm). The new graphene aerogel with unique structure exhibited excellent properties, such as high specific surface area, high porosity, and better electrochemical properties. All data suggest that this graphene aerogel may have promising application prospect in the field of energy.

Key words: three-dimensional graphene, graphene aerogel, graphene, graphene oxide, Nafion

CLC Number:

O613

WANG Yong, YU Yun, FENG Ai-Hu, JIANG Feng, HU Xue-Bing, SONG Li-Xin. Nafion Modified Graphene Aerogel with Hierarchical Porous Structures[J]. Journal of Inorganic Materials, 2018, 33(4): 469-474.

Figures/Tables 8

Fig. 1 AFM height image of GO (a), GO modified with Nafion (b) and the height profiles of GO (c) and GO modified with Nafion (d)

Fig. 2 XRD patterns of GO, rGO, graphite, GA and GA-Nafion

Fig. 3 Raman spectra of GO, rGO, GA and GA-Nafion

Fig. 4 FT-IR spectra of GO, rGO, GA and GA-Nafion

Fig. 5 SEM morphologies of GA (a), GO nano sheets modified with Nafion (b), GA-Nafion (c) and its high resolution morphology (d)

Fig. 6 Chemical structure of Nafion

Fig. 7 Specific surface area of GO, rGO, GO-EDA, and GA-Nafion

Fig. 8 Cyclic voltammogram of activated carbon (AC), GA and GA-Nafion

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