Multi-Shelled CaO Microspheres Stabilized by Atomic Layer Deposition of Al2O3 for Enhanced CO2 Capture Performance
In this work, we report on the synthesis of a CaO-based CO2 sorbent with structural characteristics that affect very favourably their CO2 uptake. These sorbents feature a hollow spherical morphology, whereby the central void accompanies the large volumetric expansion of the material during CO2 capture.
The shell of the hollow sphere is composed of small nanoparticles of CaO, thus, reducing effectively diffusive transport limitations through the growing product layer of CaCO3. Finally, to ensure the thermal stability of the material, a layer of Al2O3 with a thickness of less than 3 nm was deposited conformally by atomic layer deposition (ALD).
Authors: A. Armutlulu, A. Naeem, , S. Kim, A. Kierzkowska, A. Fedorov, Hsueh-Ju
Paper was accepted in Advanced Materials.