Granules of graphene oxide by spray drying

a technology of graphene oxide and granules, which is applied in the field of granules of graphene oxide, can solve the problems of increasing the degree and complexity of corrugation, and achieve the effects of reducing graphene oxide, increasing the degree and complexity of corrugation, and reducing surface area

Inactive Publication Date: 2014-07-24
STEVENS INSTITUTE OF TECHNOLOGY
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Benefits of technology

[0009]In an embodiment of the present invention, granules comprising graphene nanosheets have a corrugated morphology with substantially greater surface area and longer ion pathways than non-corrugated granules of comparable size. In some embodiments, the granules include a structural modifier that modifi...

Problems solved by technology

In some embodiments, the granules include a structural modifier that modifies the ...

Method used

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  • Granules of graphene oxide by spray drying
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  • Granules of graphene oxide by spray drying

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Embodiment Construction

[0019]The present invention includes a method of making granules of graphene oxide having a three-dimensional corrugated morphology, which includes a step of spray drying a graphene oxide dispersion. In some embodiments of the invention, a suitable graphene oxide dispersion is prepared by dispersing graphite oxide solid into a solvent under ultrasonic conditions to form a stable dispersion of single molecular layers of graphene oxide. In some embodiments of the invention, the nanosheets of graphene oxide have a thickness of one to a few molecular layers and lateral dimensions of about 100 nm to about 1000 nm (1 μm). In other embodiments of the present invention, graphene oxide dispersions prepared by other means, or having graphene oxide sheets with other thicknesses or other nanoscale or microscale lateral dimensions may be used.

[0020]In an embodiment of a method of the present invention, a graphene oxide dispersion is spray dried using, for example, a commercial spray dryer to pro...

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Abstract

Granules of graphene oxide may be produced from a dispersion of nanoscale graphene oxide sheets by a spray drying method. Such granules have a three-dimensional corrugated morphology. The complexity of the corrugations, and the size distribution of the granules can be varied through selection of the spray-drying equipment used, and variation of the composition of the dispersion and the spray-drying parameters. Structural modifiers may be included in the graphene oxide dispersion to control the ultimate morphology of the granules. The granules of graphene oxide may be thermally reduced at a moderate temperature of 220° C. to increase the granules' electrical conductivity. The reduced granules may be used to fabricate electrodes for supercapacitors. The power and energy density of such an electrode material is comparable to those of conventional/commercial activated carbon-based electrodes.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims the benefit of U.S. Provisional Patent Application No. 61 / 754,223, filed on Jan. 18, 2013, the disclosure of which is incorporated by reference herein.FIELD OF THE INVENTION[0002]The present invention relates to granules of graphene oxide and methods of making same, and, more specifically, to granules of graphene oxide useful for fabricating electrical components.BACKGROUND OF THE INVENTION[0003]Graphene has recently received significant attention due to its many attractive properties, including: chemical and electrochemical stability; electrical conductivity; and high theoretical surface area (e.g., 2630 m2 / g). This theoretical surface area compares well to those of: carbon nanotubes (CNT) (e.g., 1315 m2 / g); and is commercially available activated carbon (typically, 500 m2 / g). A common method of producing CNT is chemical vapor deposition (CVD), which has remained quite expensive despite several decades of r...

Claims

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Application Information

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IPC IPC(8): C01B31/04
CPCC01B31/043C01B32/184C01B32/23H01G11/36Y02E60/13Y10T428/2982
Inventor QIU, HONGWEIBECHTOLD, THOMAS A.LE, LIHN TUNGLEE, WOO YOUNG
Owner STEVENS INSTITUTE OF TECHNOLOGY
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