Ultralight‐Weight Graphene Aerogels with Extremely High Electrical Conductivity
Lucía dos Santos‐Gómez, José R. Garcı́a, Miguel A. Montes‐Morán, J.Á. Menéndez, Santiago García‐Granda, Ana Arenillas
Abstract
Abstract The integration of 2D graphene sheets into a porous and macroscopic structure is extremely attractive for application in several electrochemical fields. In this regard, for the first time, the synthesis of 3D graphene aerogels is reported by using a rapid, easy, cost‐effective, and scalable at industrial level methodology. These aerogels integrate the intrinsic properties of graphene with a high pore volume. To achieve this ultraporous graphene network, resorcinol/formaldehyde polymer with controllable porosity is employed as a binder and a cross‐linker material, and a graphene oxide solution provides the graphene building blocks. Two series of materials with and without catalyst for resorcinol/formaldehyde reaction and with different synthesis conditions and graphene contents are studied. The resulting graphene aerogels present low density, large macroporosity, and electrical conductivity values as high as 852 S m −1 , with 97.58% of porosity, which is the highest value of electrical conductivity reported so far in the literature for ultralight‐weight graphene aerogels.