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Synthesis of N‐Doped Core–Shell‐Structured Porous CoSe@C Composites and their Efficient Catalytic Activity for the Reduction of 4‐Nitrophenol
Author(s) -
Zhao Haoyang,
Li Yunhui,
Wang Dongsheng,
Zhao Lang
Publication year - 2018
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201701259
Subject(s) - calcination , catalysis , chemistry , x ray photoelectron spectroscopy , cobalt , metal organic framework , carbon fibers , chemical engineering , inorganic chemistry , adsorption , materials science , composite number , organic chemistry , composite material , engineering
In this work, core–shell‐structured CoSe@C and N‐CoSe@C dodecahedra were successfully obtained through the calcination of cobalt‐based metal–organic frameworks (ZIF‐67 as a Co‐based MOF or the N‐containing N‐ZIF‐67). In this approach, the cobalt species in the ZIF‐67 or N‐ZIF‐67 reacted with selenium powder to form CoSe nanoparticles in situ, and the organic species were transformed into carbon materials at temperatures between 700 and 900 °C for 2 h under a nitrogen atmosphere. The as‐synthesized materials were used for the reduction of 4‐nitrophenol (4‐NP) assisted by NaBH 4 . All of the catalysts could catalyze the reduction of 4‐NP to 4‐AP, and N‐CoSe@C‐800‐4 possessed the highest catalytic activity and could completely convert 4‐NP to 4‐AP in only 40 s at ambient temperature. This catalytic activity may be attributed to the high nitrogen content (4.15 %) of N‐CoSe@C‐800‐4. The morphologies and compositions of the synthesized samples were investigated by SEM, TEM, energy‐dispersive X‐ray spectroscopy (EDX), XRD, X‐ray photoelectron spectroscopy (XPS), and nitrogen adsorption–desorption measurements.