Completely Monodisperse Graphene Dispersions Imparting Film of High Specific Capacitance

Graphene has emerged as a remarkable material with diverse applications in the field of optoelectronics and energy storage. However, the challenge lies in producing high-quality graphene via liquid phase methods that can match the optoelectronic properties achieved through expensive techniques like chemical vapor deposition (CVD) or micromechanical cleaving. Existing liquid phase methods suffer from issues such as graphene oxidation during production, layer number dispersion, and small flake size, which significantly compromise the overall quality of the material and its potential applications. We demonstrate the synthesis of completely layer number-monodisperse graphene dispersions using anodic electrochemical exfoliation with exceptional optoelectronic properties comparable to CVD-derived graphene. A notable highlight of our research is the high specific capacitance of the film formed from the electrochemically exfoliated graphene dispersions (259- 666 F g -1 ), which is highly promising for capacitive energy storage applications. We have successfully addressed the difficulties related to oxidation and the uneven distribution of layers, achieving large flake sizes. This progress was achieved by employing a tailored synthesis method maneuvered through electrochemical characterizations and precise management of experimental variables during the intercalation, exfoliation, and further processing steps. Thus, this research contributes significantly to the ongoing advancements in graphene synthesis and graphite intercalation science.