Abstract
The formation of a MgCO3 shell hampers CO2 capture efficiency in MgO. Our previous studies developed MgO/Mg(OH)2 composites to facilitate CO2 diffusion, improving capture efficiency. However, MgCO3 still formed along the interfaces. To tackle this issue, we engineered the MgO/Mg(OH)2 interfaces by incorporating Cl−, SO42−, and PO43− additives. Novel MgO–H2O–MgX (X = Cl−, SO42−, and PO43−) composites were synthesized to explore the role of additives in preventing MgCO3 formation. MgO–Mg(OH)2–MgCl2 nano-composites displayed enhanced CO2 adsorption and stability. This breakthrough paves the way for effective bio-inspired strategies in overcoming CO2 transport barriers in MgO-based adsorbents. Mg(OH)2–MgO interface for CO2 bypass.