Oxygen Vacancy-rich Porous Co3O4 Nanosheets toward Boosted NO Reduction by CO and CO Oxidation: Insights into the Structure–Activity Relationship and Performance Enhancement Mechanism

• DOI: 10.1021/acsami.9b08664
• Publication Date: 2019-10-17T21:12:26Z
• Authors: Xinyang Wang; Xinyong Li; Jincheng Mu; Shiying Fan; Xin Chen; Liang Wang; Zhifan Yin; Moses Tadé; Shaomin Liu
• Keywords: Technology; surface oxygen vacancy; SURFACE; Materials Science; Co3O4 nanosheets; 01 natural sciences; 7. Clean energy; ACTIVATION; N2O DECOMPOSITION; MANGANESE OXIDE; WATER; Nanoscience & Nanotechnology; CERIA; Science & Technology; Multidisciplinary; NITRIC-OXIDE; 660; ORDERED MESOPOROUS CO3O4; NO reduction by CO; CATALYTIC PERFORMANCES; 540; CO oxidation; 0104 chemical sciences; 13. Climate action; Science & Technology - Other Topics; MORPHOLOGY; facile surface reduction

Oxygen vacancy-rich porous Co3O4 nanosheets (OV-Co3O4) with diverse surface oxygen vacancy contents were synthesized via facile reduction and applied to NO by CO oxidation. The structure-activity relationship between vacancies catalytic performance was systematically investigated. By combining Raman, X-ray diffraction, transmission electron microscopy, photoelectron spectroscopy, O2-temperature programmed desorption, it found that the efficient leads presence of more thus distinctly enhance amount mobility OV-Co3O4. transfer towards Co sites promoted higher content. Compared pristine nanosheets, is beneficial for enhancement OV-Co3O4 obtained in 0.05 mol L-1 NaBH4 solution (Co3O4-0.05) exhibited best activity, achieving 100% conversion at 175 °C 100 oxidation, respectively. Co3O4-0.05 outstanding stability resistance high gas hour space velocity both reactions. Combining situ DRIFTS results, enhanced should be attributed formation transformation dinitrosyl species -NCO lower temperatures. oxidation due promotion activation ability, mobility, as well CO2 desorption ability. results indicate direct regulation could an way evidently