Glucose/Graphene-Based Aerogels for Gas Adsorption and Electric Double Layer Capacitors

In this study, three-dimensional glucose/graphene-based aerogels (G/GAs) were synthesized using the hydrothermal reduction and CO₂ activation method. Graphene oxide (GO) was used as a matrix, and glucose was used as a binder for the orientation of the GO morphology in an aqueous media. We determined that G/GAs exhibited narrow mesopore size distribution, a high surface area (763 m² g^-1), and hierarchical macroporous and mesoporous structures. These features contributed to G/GAs being promising adsorbents for the removal of CO₂ (76.5 mg g^-1 at 298 K), CH₄ (16.8 mg g^-1 at 298 K), and H₂ (12.1 mg g^-1 at 77 K). G/GAs presented excellent electrochemical performance, featuring a high specific capacitance of 305.5 F g^-1 at 1 A g^-1, and good cyclic stability of 98.5% retention after 10,000 consecutive charge-discharge cycles at 10 A g^-1. This study provided an efficient approach for preparing graphene aerogels exhibiting hierarchical porosity for gas adsorption and supercapacitors.