Capillary slit-induced self-assembly overcomes restacking that hinders ion transport in graphene-based supercapacitors

https://www.eurekalert.org/news-releases/1116354

"drop-casting results in messy inefficient layers, overcome using narrow glass slits guiding drying, forcing graphene flakes into highly ordered, laminated structure optimizing electron/ ion movement... mild sulfuric acid converts inactive epoxy groups into electrochemically active hydroxyl groups, adding pseudocapacitance... result: durable, freestanding film not needing substrate... high efficiency, 1,589.78 mF cm^-2 areal capacitance, 99.80% cycling stability after 20K cycles... compact, flexible electronics"