Interfacial Charging–Decharging Strategy for Efficient and Selective Aerobic NO Oxidation on Oxygen Vacancy
2019
Li, Hao | Shang, Huan | Li, Yuhan | Cao, Xuemei | Yang, Zhiping | Ai, Zhihui | Zhang, Lizhi
Intelligent defect engineering to harness surface molecular processes is at the core of selective oxidation catalysis. Here, we demonstrate that the two-electron-trapped oxygen vacancy (VO) of BiOCl, a prototypical F center (VŐ′′), is a superb site to confine O₂ toward efficient and selective NO oxidation to nitrate. Stimulated by solar light, VŐ′′ accomplishes NO oxidation through a two-electron charging (VŐ′′ + O₂ → VŐ′′-O₂²–) and subsequent one-electron decharging process (VŐ′′-O₂²– + NO → VO-NO₃– + e–). The back-donated electron is retrapped by VO to produce a new single-electron-trapped VO (VO′), simultaneously triggering a second round of NO oxidation (VO′-O₂ + NO → VO-NO₃–). This unprecedented interfacial charging–decharging scheme alters the peroxide-associated NO oxidation selectivity from NO₂ to NO₃– with a high efficiency and thus hold great promise for the treatment of risky NOₓ species in indoor air.
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