Design of hyperporous graphene networks and their application in solid-amine based carbon capture systems

摘要: We demonstrate a simple and fully scalable method for obtaining hierarchical hyperporous graphene networks of ultrahigh total pore volume by thermal-shock exfoliation graphene-oxide (exfGO) at relatively mild temperature 300 °C. Such per unit mass has not previously been achieved in any type porous solid. find that the amount oxidation starting is key factor determines surface area final material after thermal shock. Specifically, we emphasize development hyperporosity directly proportional to enhanced sp2 CC form CO/COO. Using our method, reproducibly synthesized remarkable meso-/macro-porous with exceptionally high volumes, exceeding 6 cm3 g−1. This step change compared ≤3 g−1 conventional GO under similar synthetic conditions. Moreover, record amine impregnation >6 g readily attained exfGO samples (solid-amine@exfGO), where loading controlled pore-structure host materials. solid-amine@exfGO exhibit an selective flue-gas CO2 capture 30–40 wt% 75 °C working capacity ≈25 very long cycling stability simulated stream To best knowledge, this first report based carbon network used amines application storage stability.