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pH‐Dependent Aqueous Solution‐Grown Highly Nanocrystalline Nickel Cobalt Sulfides ( NiCo 2 S 4 )
Author(s) -
Jeon Youngjin,
Choi Kwanbeom,
Lee Seungje,
Heo Jungseok
Publication year - 2021
Publication title -
bulletin of the korean chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 59
ISSN - 1229-5949
DOI - 10.1002/bkcs.12279
Subject(s) - nanocrystalline material , bimetallic strip , x ray photoelectron spectroscopy , transmission electron microscopy , nickel , aqueous solution , cobalt sulfide , cobalt , chemistry , nuclear chemistry , spectroscopy , crystallography , materials science , chemical engineering , inorganic chemistry , metal , nanotechnology , electrochemistry , organic chemistry , electrode , engineering , physics , quantum mechanics
NiCo 2 S 4 is an important bimetallic spinel‐type sulfide that is typically synthesized using a two‐step method, which commonly involves water as a reaction medium. Here, we show that highly crystalline and high surface area NiCo 2 S 4 could be synthesized into a nanoflake‐entangled shape. Control of solution pH under a hydrothermal condition affects the compositions and morphologies of products. It reveals that the p K a s of two transition metal ions and l ‐cysteine ( l ‐Cys) play a crucial role in the formation of NiCo 2 S 4 . Various spectroscopic analyses were performed to characterize these products, including X‐ray diffraction, energy‐dispersive X‐ray spectroscopy, gas sorption, scanning electron microscopy, transmission electron microscopy, and X‐ray photoelectron spectroscopy.