Fabrication of graphene supported carbon‐coating cobalt and carbon nanoshells for adsorption of toxic gases and smoke

Abstract

Graphene-supported carbon-coating cobalt and carbon nanoshells (Co/C-GNS and CNS-GNS) were fabricated and their applications in absorbing toxic gases and smoke have been investigated. Co 3 O 4 -loaded reduced graphite oxide was first prepared via a coprecipitation process, then carbon coatings on cobalt nanoparticles were fabricated by a catalytic carbonization process. The obtained hybrids were characterized by X-ray diffraction, transmission electron microscopy, Raman spectroscopy, N 2 absorption/ desorption, and thermogravimetric analysis. Co/C core/shell structure and hollow carbon nanoshells in the size range of 15-22 nm were anchored onto the graphene surfaces. The resultant Co/C-GNS and CNS-GNS performed an important function in CO removal and smoke suppression during the combustion of acrylonitrile-butadiene-styrene. The good performance could be attributed to the combination effect of physical barrier of the GNS, porosity structure of the carbon nanoshells, and carbonization of the Co nanoparticles.

Facile synthesis of Co3O4porous nanosheets/reduced graphene oxide composites and their excellent supercapacitor performance

“…The Raman spectra of graphite oxide, RGO and Co 3 O 4 /RGO-0.50 composite display two prominent peaks, corresponding to the D and G band of carbon, respectively. The D band, observed at about 1350 cm À1 , is associated with structural defects and disorders that break the symmetry and selection rule, while the G band, at about 1590 cm À1 , is usually assigned to the E 2g phonon of C sp 2 atoms 48. The integrated intensity ratio of D to G band, denoted as I D /I G , is associated with the conjugated graphene network (sp 2 domain) of graphene sheets.…”

Application of 2D Materials for Adsorptive Removal of Air Pollutants

“…The hybridization of the graphene nanosheets and graphitic carbon materials is reported to significantly enhance the specific surface area and porosity for optimal absorption of CO gas. 85 Theoretical studies using molecular dynamic simulations and density functional studies have shown that functionalization with polar groups such as COOH, NH 2 , NO 2 , and H 2 PO 3 and doping with Ti and Ca ions in graphene are beneficial for adsorption of CO 2 and CH 4 . 86−88 Thermally reduced GO at 200 °C, N-doped rGO, and the polyaniline graphene composite are reported to have CO 2 adsorption capacities of 21.6, 4.3, and 75 mmol/g, respectively at 298 K. 89−91 Nanomesh graphene (NMG) synthesized via the CVD process is reported to show high CH 4 and CO 2 uptakes of 14.8 and 36.5 mmol/ g, respectively, due to its optimum pore size (1−4 nm) distribution and high surface area of 2038 m 2 /g.…”

“…Moreover, water trapped in the pores of hygroscopic GO may enable the dissolution of absorbed SO 2 and H 2 S gas to H 2 SO 4 . The hybridization of the graphene nanosheets and graphitic carbon materials is reported to significantly enhance the specific surface area and porosity for optimal absorption of CO gas …”