Manganese-based layered double hydroxide nanoparticles as highly efficient ozone decomposition catalyst with tunable valence state
Manganese oxides are well explored effective ozone decomposition catalysts, but the accumulation of oxygen trapped on surface and high valence state restrict their catalyst efficiency. Herein, we report manganese based layered double hydroxides (LDHs) catalysts with different average oxidation states (AOS) of Mn. The MgMnAl-LDHs catalysts show large specific surface area, abundant oxygen vacancy, stable structure and excellent catalytic ozone decomposition performance. The valence state of Mn can be tuned by adjusting the metallic element ratio on the LDHs matrix, and catalyst with AOS of only 2.3 is acquired. The impacts of valence state of Mn on catalytic ozone decomposition process were further studied by density functional theory (DFT) calculation. It is found that the Mn2+ facilitates the desorption of generated oxygen on the surface of LDHs, while Mn3+ and Mn4+ contribute to the dissociation of adsorbed ozone.
- This article is part of the themed collection: 2020 Nanoscale HOT Article Collection