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Ultrathin Nitrogen‐Enriched Carbon Cover‐Enhanced Stability and Wettability of Au Nanocrystals on Core‐Shell Fe 3 O 4 @N‐Carbon Particles for Heterogeneous Catalysis
Author(s) -
Wang Junyan,
Tian Kesong,
Cao Ling,
Guo Wanchun,
Li Ruifei,
Wang Hongchao,
Xu Zhaopeng,
Zhou Yunchun,
Wang Haiyan
Publication year - 2020
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202000009
Subject(s) - carbon fibers , catalysis , x ray photoelectron spectroscopy , materials science , nitrogen , chemical engineering , pyrolysis , nanocrystal , wetting , transmission electron microscopy , inorganic chemistry , nanotechnology , chemistry , organic chemistry , composite material , composite number , engineering
We report a core‐shell Fe 3 O 4 @nitrogen‐doped carbon@Au@nitrogen‐doped carbon (Fe 3 O 4 @N‐Carbon@Au@N‐Carbon) nanocatalyst based on a combined strategy, layer‐by‐layer deposition of aminophenol‐formaldehyde (APF) resin and subsequent pyrolysis. Isolated Au nanocrystals were sandwiched between ultrathin nitrogen‐enriched carbon cover and core‐shell Fe 3 O 4 @N‐Carbon. Transmission electron microscopy, X‐ray diffractor, X‐ray photoelectron spectroscopy, and other analysis methods were used to characterize the catalyst. Ultrathin nitrogen‐enriched carbon cover could stabilize Au nanocrystals, enhance their wettability with liquid polar organic substrates, and offer a relatively short transfer route of substrates towards active Au sites during catalytic transformations. For the reduction of 4‐nitrophenol, 2‐nitrophenol, 4‐nitroaniline and 2‐nitroaniline, the catalyst exhibits corresponding high turnover frequency of 378, 522, 834 and 846 h −1 , respectively. The catalyst also shows high stability over 20 cycles almost without obvious structural damage and activity loss for reduction of 4‐nitrophenol.