Capturing CO2 in the form of gas hydrate facilitates efficient carbon capture, reducing CO2 in the atmosphere. Thus, Hydrate-based CO2 Capture Technology(HBCC) is ascending to be a promising approach for a cleaner environment. The HBCC technique captures CO2 during hydrate formation and is stably remained inside the hydrate cavities under the formation conditions. Providing that appropriate conditions are given, CO2 hydrate can be used as an effective storage and transportation for both CO2 and cold thermal energy. In addition, previous research confirmed that the dissociation enthalpy of CO2 hydrate ice mixture shows approximately 1.5 times larger than that of ice. This characteristic allows CO2 hydrate ice mixture slurry as a two-phase secondary refrigerant, in which the phase-change material is the CO2 hydrate. In this study, the characteristics of CO2 hydrates in the presence of prevalent promoters are analyzed extensively from various perspectives. CO2 hydrates were formed in an agitating environment under various pressure and promoter concentration conditions. Three thermodynamic promoters were selected to ease the equilibrium conditions: cyclopentane(CP), tetrahydrofuran(THF), tetra-n-butylammonium bromide(TBAB). Hydrate formation regions, exothermic behavior during hydrate formation, induction time, and CO2 gas uptake under various experimental conditions were investigated. Additionally, microscopic and spectroscopic approaches were taken to comprehend the structural and surficial characteristics of each hydrates using focused ion beam scanning electron microscopy(FIB-SEM) and X-ray diffraction(XRD) methods. The experimental results reveal that CO2+THF hydrate is advantageous for CO2 capture under low pressure conditions, while CO2+CP hydrate exhibited superior performance under higher pressure conditions.