Abstract
Manganese oxide catalysts (MnOx) are expected to be utilized to catalytic ozone (O3) decomposition to curb indoor O3 pollution. However, the accumulation of oxygen-containing species (*OO) on the active site (oxygen vacancy, Ov) of MnOx limits the practical application. Herein, α-MnO2 with exposed {100} (Mn-100), {110} (Mn-110), or {310} (Mn-310) facet was synthesized, respectively. Mn-110 has preferred performance and stability, maintaining 99.9 % O3 conversion after 8 h under 35 % RH. Experimental and theoretical results indicated that the Mn-100 facet owns lower Ov content and *OO adsorption energy, exhibiting the highest specific area normalized activity. Mn-310 has a higher vacancy content and enhanced *OO adsorption energy, which resulted in a rapid accumulation of *OO species. Mn-110 has a moderate Ov content and *OO adsorption and thus exhibits optimal activity. This study hopes to point out a new optimization strategy for MnOx catalysts.
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