Graphene aerogels: a review

Abstract

Graphene based aerogels (GAs) are 3D scaffold materials that can be lighter than air. Due to their fascinating properties, such as, high mechanical strength and electrical conductivity, thermal resistance and adsorption capacity, they have attracted a lot of interest currently. This review, covers the main routes for obtaining GAs namely, hydrothermal reduction/self-assembly, chemical reduction, template-directed reduction, cross-linking and sol–gel processes. Potential application fields for example in energy storage and environmental protection are also discussed. Finally, the future prospects of this exciting field based on the results published so far are examined.

Recent Progress in Ruthenium Oxide‐Based Composites for Supercapacitor Applications

“…It is worth mentioning that "aerogels" are synthetic highly porous, lightweight materials derived when solvent (water) is preferentially evaporated from a hydrogel under supercritical conditions that prevents shrinkage of the system. [252] The ternary composite showed impressive electrochemical features, as demonstrated in Figure 16. [253] Comparative study of the ternary-3D-RuO 2 /graphitic C 3 N 4 /rGO-aerogel (RCGA)and binary 3D-RuO 2 / rGO aerogel composite (RGA)composite shows that the former sample electrode exhibits near-rectangular CV curves indicating better supercapacitive behavior with higher current densities at varying potential scan rates as observed in Figure 16(a)-(b).…”

A green synthesis of nanocatalysts based on reduced graphene oxide/magnetic nanoparticles for the degradation of Acid Red 1

“…[15][16][17] Among the various graphene structures, aerogels with a three-dimensional (3D) assembly show great promise for a wide range of applications due to their high porosity, high specic surface area and ultra-low density together with excellent mechanical and thermal resistance, which make them extraordinary adsorbents for a variety of applications. 18 Nevertheless, the isolation of the aerogel from the solution aer the purication process is challenging. Magnetic nanoparticles have shown to be very useful for this purpose, and thus have been recognized as the dominant component of environmental clean-up technologies due to their excellent magnetic properties, which allow easy recycling of these nanostructures from the bed.…”

2020 Roadmap on Carbon Materials for Energy Storage and Conversion

“…Graphene aerogels (GAs) are three‐dimensional structures resulting from the self‐assembly of graphene oxide dispersions, the subsequent gelation in tandem with the reduction of graphene oxide through hydrothermal or/and chemical reduction, and finally, after drying these structures with freeze, supercritical and ambient pressure drying The high surface area, high porosity, high electrical conductivity, high specific capacitance and high cyclic stability make these materials ideal to be used as electrodes for LIBs and supercapacitors.…”