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Aerogels have attracted significant attention recently due to theirultra-light weight porous structure, mechanical robustness, high electricalconductivity, facile scalability and their use as gas and oil absorbers.Herein, we examine the multi-functional properties of hybrid aerogelsconsisting of reduced graphene oxide (rGO) integrated with hexagonal boronnitride (hBN) platelets. Using a freeze-drying approach, hybrid aerogels arefabricated by simple mixing with various volume fractions of hBN and rGO up to0.5/0.5 ratio. The fabrication method is simple, cost effective, scalable andcan be extended to other 2D materials combinations. The hybrid rGO/hBN aerogels(HAs) are mechanically robust and highly compressible with mechanicalproperties similar to those of the pure rGO aerogel. We show that the presenceof hBN in the HAs enhances the gas absorption capacities of formaldehyde andwater vapour up to ~7 and > 8 times, respectively, as compared to pure rGOaerogel. Moreover, the samples show good recoverability, making them highlyefficient materials for gas absorption applications and for the protection ofartefacts such as paintings in storage facilities. Finally, even in thepresence of large quantity of insulating hBN, the HAs are electricallyconductive, extending the potential application spectrum of the proposedhybrids to the field of electro-thermal actuators. The work proposed here pavesthe way for the design and production of novel 2D materials combinations withtailored multi-functionalities suited for a large variety of modernapplications.

Multi-functional 2D hybrid aerogels for gas absorption applications