Carbon-based materials for energy storage

Various carbon nanostructures were investigated as hydrogen storage materials. Hydrogen was physically adsorbed on the carbon nanomaterials. The hydrogen storage capacities of the carbon materials were volumetrically measured at different experimental conditions of temperature and hydrogen pressure. Thermodynamic investigation was performed to understand the effect of temperature and hydrogen pressure on the hydrogen storage capacity. The detailed understanding of hydrogen sorption behaviors of the carbons was obtained by correlating the hydrogen storage capacities with the carbon physical properties, and the important physical parameters of the carbons were defined. Pd doped carbons were investigated as the other hydrogen storage materials that can lead to weak chemisorption of atomic hydrogen. The effects of Pd doping, Pd doping amount, and Pd particle sizes on the hydrogen storage capacities of the Pd doped Sepiolite Derived Carbon Nanofiber (SDCN) s were mainly investigated. The schematic studies by using Differential Scanning Calorimeter (DSC) and Fourier Transform Infrared Spectroscopy (FTIR) provided the detailed understanding of the hydrogen adsorption/desorption behaviors of the Pd doped SDCNs.; Various carbon structure materials were investigated as carbon negative electrode materials in Li-ion rechargeable batteries. The thermal properties of the carbon electrode materials were mainly studied with considerations to the carbon physical properties. DSC analyses on the carbon electrode materials showed that the carbon BET surface area is an important parameter to determine the thermal properties of the delithiated carbon electrode materials as thermally unstable solid electrolyte interface is formed on the carbon surface. Meanwhile, the carbon structure is an important parameter to determine the thermal properties of the fully lithiated carbon electrode materials. The DSC results were supported by X-ray diffraction studies.