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Engineering Crystal Facet of α-MnO2 Nanowire for Highly Efficient Catalytic Oxidation of Carcinogenic Airborne Formaldehyde
Abstract
The activity of exposed crystal facets directly determines its physicochemical properties. Thus, acquiring a high percentage of reactive facets by crystal facet engineering is highly desirable for improving the catalytic reactivity. Herein, single-crystalline α-MnO 2 nanowires with major exposed high-index {310} facets were synthesized via a facile hydrothermal route with the assistance of a capping agent of oxalate ions. Comparing with two other low-index facets ({100} and {110}), the resulting α-MnO 2 nanowires with exposed {310} facets exhibited much better activity and stability for carcinogenic formaldehyde (HCHO) oxidation, making 100% of 100 ppm of HCHO mineralize into CO 2 at 60 °C, even better than some Ag supported catalysts. The density functional theory (DFT) calculations were used to investigate the difference in the catalytic activity of α-MnO 2 with exposed {100}, {110}, and {310} facets. The experimental characterization and theoretical calculations all confirm that the {310} facets with high surface energy can not only facilitate adsorption/activation of O 2 and H 2 O but also be beneficial to the generation of oxygen vacancies, which result in significantly enhanced activity for HCHO oxidation. This is a valuable report on engineering surface facets in the preparation of α-MnO 2 as highly efficient oxidation catalysts. This study deepens the understanding of facet-dependent activity of α-MnO 2 and points out a strategy to improve their catalytic activity by crystal facet engineering.
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Cited by
Yang, W., Su, Z., Xu, Z., Yang, W., Peng, Y., & Li, J. (2020) · Applied Catalysis B: Environmental · doi:10.1016/j.apcatb.2019.118150 · Cited by 746
Zhao, Q., Zheng, Y., Song, C., Liu, Q., Ji, N., Ma, D., & Lu, X. (2020) · Applied Catalysis B: Environmental · doi:10.1016/j.apcatb.2019.118552 · Cited by 325
Biotechnology Progress for Removal of Indoor Gaseous Formaldehyde
Shao, Y., Wang, Y., Zhao, R., Chen, J., Zhang, F., Linhardt, R. J., & Zhong, W. (2020) · Applied Microbiology and Biotechnology · doi:10.1007/s00253-020-10514-1 · Cited by 76
Metadata
- Authors
- Rong, S., Zhang, P., Liu, F., & Yang, Y.
- Venue
- ACS Catalysis
- Publisher
- American Chemical Society (ACS)
- Published
- 2018-03-14
- Volume
- 8
- Issue
- 4
- Pages
- 3435-3446
- ISSN
- 2155-5435 (ISSN-L)
- OpenAlex
- W2789449801
- Cited by
- 745
- References
- 6
- FWCI
- 19.25
- Type
- journal article
- Language
- en
- Open access
- closed
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