Role of interlayer spacing and functional group on the hydrogen storage properties of graphene oxide and reduced graphene oxide

Abstract

Available online xxxKeywords: Hydrogen storage Graphene oxide Interlayer space Functional group Reduce graphene oxide Structural characterization a b s t r a c t Hydrogen storage properties of the derivatives of graphene, graphene oxide/reducedgraphene oxide are studied in this paper. Modified Hummer's method was adopted for synthesis of graphene oxide (GO) and reduced-graphene oxide (rGO). The morphology of GO/rGO was examined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The presence of C]O and eOH group in the Fourier transform infrared (FTIR) spectrum and G-mode and 2D-mode in the micro-Raman studies confirmed the synthesis of the GO and rGO. Furthermore, the structural investigations using powder x-ray diffraction (XRD) reveals the hexagonal crystallographic phase of GO/rGO. The hydrogenstorage capacity of the GO/rGO sample is measured using indigenously fabricated high pressure hydrogen storage Sieverts' type volumetric setup at room temperature and pressure up to 80 bars. In present experimental investigations, GO was found to exhibit better H 2 uptake capacity (1.90wt.%) as compared to rGO (1.34 wt.%) at room temperature. It can be said that the oxygen functional groups work as spacers in between the graphene layers and increase the inter-layer space which in turn accumulate more number of hydrogen molecules on surface of carbon nano-sheets.

Structural Applications of Thermal Insulation Alkali Activated Materials with Reduced Graphene Oxide

“…The morphology of waste EPS beads is spherical with closed pores, as shown in Figure 3. The graphene oxide (GO) was prepared from graphite power by the modified Hummer's method [59][60][61]. The product (GO) was further reduced by hot NaOH solution to obtain rGO [62][63][64].…”

Synthesis of Graphene Oxide from Waste Carbon Tyre using Modified Hummer’s Method

“…From the previous research, Raman spectra of graphene and graphene oxide presented similar basal structure profiles with characteristic D band at around 1334cm-1 and G band at around 1590cm -1 . The 2D band in the graphene oxide indicated that all graphitic layer been oxidized [15]. The sample was placed on the glass slide and put under the Raman spectroscopy for characterization.…”

“…3, the Raman spectra obtained display two peaks which at 1361cm -1 and 1596 cm -1 corresponding to the well documented D-band and G-band. The band at 2434cm -1 is known as the 2D band which is indicated that all graphite layers have been oxidized [15]. Compared to the Raman spectra from raw carbon tyre, the peak for D-band and G-band is 1339cm -1 and 1581cm -1 .…”

CO2 and SO2 Pressure-Driven Adsorption by 3D Graphene Nanoslits: A Molecular Dynamics Study

“…A small variation in the interlayer distance of graphene can promote dynamical anomalies in the fluid viscosity [48] and diffusion [49] and even in their phase diagram [50]. Additionally, the interlayer separation (d z ) yields important consequences on the graphene membrane's adsorption capacity [51,52].…”