<p>Calcium looping represents a high-temperature method designed to capture CO₂, making it appropriate for CO₂ capture from flue gases post-combustion in power plants after combustion or for integration with fuel transformation techniques in pre-combustion CO₂ sequestration systems. This method employs solid sorbents of CaO sourced from natural limestone, leveraging the chemical interaction of CaO with CO₂, which ultimately results in the formation of CaCO₃, thereby facilitating effective CO₂ capture. In this research, multiple metal-incorporated CaO-based sorbents were produced through the sol–gel method. Notably, the CaO-based sorbent with a Ca/Ce doping ratio of 15 demonstrates exceptional CO₂ capture ability and stability, maintaining 13.20&#xa0;mmol/g of CO₂ adsorption capacity after 20 carbonation/calcination cycles. Various characterization techniques, including X-ray diffraction (XRD), N₂ physisorption, scanning electron microscopy (SEM), high-angle annular dark field scanning transmission electron microscopy/energy dispersive spectroscopy (HAADF-STEM/EDS), temperature-programmed-desorption with CO₂ (CO₂-TPD), Fourier Transform Infrared Spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) are employed to demonstrate that the presence of nanoscale CeO₂ significantly enhanced the diffusion of CO₂ during the adsorption process.</p>