Doped activated microwave expanded graphite oxide materials and doped monolayer graphene materials, and methods of making these materials. The materials exhibit increased capacitance relative to undoped activated microwave expanded graphite oxide and monolayer graphene. The materials are suitable for use in, for example, ultracapacitors.
STATEMENT OF GOVERNMENT INTEREST
 At least portions of this invention were made using U.S. government funding provided by the Department of Energy under grant number DE-SC0001951. The U.S. government has certain rights in the invention.