King Abdullah University of Science and Technology

Amira Alazmi

Krishna Prasad Katuri

Pascal E Saikaly

Pedro Miguel Costa

Pedro M F J Costa

Shafeer Kalathil

Shahid Rasul

Pedro Miguel Da Costa

The present invention is an improved method of production of graphenic materials used to store energy and the energy storage systems using such produced graphenic materials. Provided herein is a method of producing graphene oxide that includes oxidizing graphite powder in a mixture of HPOand HSOin the presence of KMnO, wherein the ratio of graphite powder to KMnOis about 1:9 by weight and the ratio of HPOto HSOis about 1:9 by volume, to produce graphene oxide; dispersing the graphene oxide in water at an acidic pH (e.g., about 0) to form a solution; adjusting the solution to about a neutral pH; and isolating the graphene oxide. An energy storage device is provided herein that includes the graphene oxide made by the disclosed methods or that includes the population (plurality) of reduced graphene oxide particles having the properties disclosed herein, such as batteries and supercapacitors.

Graphene oxide particles and method of making and using them

The impact of post-synthesis processing in, for example, graphene oxid or reduced graphene oxide materials for supercapacitor electrodes has been analyzed. A comparative study of vacuum, freeze and critical point drying was carried out for graphene oxide or hydrothermally reduced graphene oxide demonstrating that the optimization of the specific surface area and preservation of the porous network is important to maximize its properties such as supercapacitance performance. As described below, using a supercritical fluid as the drying medium, unprecedented values of specific surface area (e.g., 364 mg) and supercapacitance (e.g., 441 F g) for this class of materials were achieved.

Graphene materials and improved methods of making, drying, and applications

Reduced graphene oxide is produced by adding graphene oxide and electrically active bacteria to a container. After a period of time reduced graphene oxide is produced by an interaction of the electrically active bacteria and the graphene oxide. The resulting composition of matter includes reduced graphene oxide and electrically active bacteria. The resulting composition of matter can be doped with a plurality of different elements.

Method of producing electrically active bacteria reduced graphene oxide and electrically active bacteria reduced graphene oxide

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Thuwal, Saudi Arabia

Amira Alazmi