Graphene and the production of graphene

An electrode comprising:

• a reversibly hydrogenated graphite comprising a plurality of flakes having
• at least one flake in 10 having a size in excess of 10 square micrometers,
• a coefficient of determination value of 2D single peak fitting of μ-Raman spectra of the reversibly hydrogenated graphite after thermal treatment in inert atmosphere at 2 mbar and 800° C., collected at 532 nm excitation with a resolution better than 1.8 reciprocal centimeters, of larger than 0.99 for more than 50% of the spectra, and
• a defect density characteristic of μ-Raman spectra of the hydrogenated graphite collected at 532 nm excitation with a resolution better than 1.8 reciprocal centimeters and an excitation power below 2 mW at the focus of an 100× objective having an average D/G area ratio being between 0.2 and 4, wherein at least 60% of the defects are reversible hydrogenation of sp3-hybridized carbon sites away from the edges of the flakes.