Effect of Oxygen for Enhancing the Gas Storage Performance of Activated Green Carbon

Abstract

We investigated the gas storage capacity of thermally carbonized and chemically activated Phyllostachys bambusoides (PB), which is a nature-derived green carbon with an organic porous structure. Samples were thermally treated at 900 °C for 24 h, and then were chemically activated with different amounts of KOH. The pore distribution, surface area, and H2 storage capacity were measured by N2 and H2 gas sorption, up to 847 mmHg (1.13 bar) at 77 K. The CO2 storage capacity was measured up to 847 mmHg (1.13 bar) at 298 K. The maximum gas storage was shown in the sample activated with 6 times gravimetric ratio of chemical agent. It reached 1.86 wt% for H2 and 3.44 mmol/g for CO2. We used multilateral analysis methods (XRD, XPS, Raman spectroscopy, and scanning electron microscope) to identify the factors influencing gas sorption. We found that the amount of oxygen groups influence the enhancement of gas storage capacity. Moreover, the results showed that PB-based porous activated carbon has the potential to be used as a multirole gas storage material.

Developing High-Performance Flexible Zinc Ion Capacitors from Agricultural Waste-Derived Carbon Sheets

“…31,32 Further, to identify the aligned carbon layer, "R" factor was calculated from the XRD pattern. 33 The "R" value can be measured as the ratio of the intensity of the Bragg peak to the background. From the XRD pattern, comparable R values of 2.11 and 2.29 were obtained for ASIC and ASICKOH, respectively, indicating a single-layer graphene sheet with close to 30% carbon atoms in an organized region.…”

“…Further, both of the materials exhibited a broad peak at a 2θ value of 43.5° corresponding to the (100) plane, which represents the sp 2 -hybridized carbon, signifying the lateral extent of the graphene sheets. The broad XRD pattern indicates the amorphous feature with a limited degree of graphitization. , Further, to identify the aligned carbon layer, “ R ” factor was calculated from the XRD pattern . The “ R ” value can be measured as the ratio of the intensity of the Bragg peak to the background.…”