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Synthesis and microstructure of single‐crystalline cobalt oxyhydroxide and topotactic transformation to cobalt oxide
Author(s) -
Kusano Yoshihiro,
Kawasaki Shuji,
Takada Jun,
Azuma Masaki
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17140
Subject(s) - cobalt , cobalt oxide , materials science , microstructure , oxide , intercalation (chemistry) , sodium , ion exchange , chemical engineering , crystallography , inorganic chemistry , ion , chemistry , metallurgy , organic chemistry , engineering
Plate‐like cobalt oxyhydroxide (β‐CoOOH, heterogenite) single crystals, with a width of ~5 mm and a thickness of ~100 μm, were successfully synthesized using a simple method of heating a mixture of Co 3 O 4 and NaOH in air at 650°C, and then soaking the resultant crystals in water at room temperature. The crystals were topotactically formed from sodium cobalt oxyhydrate (Na 0.2 (H 3 O) 0.54 CoO 2 ·0.48H 2 O) by ion exchange between Na + and H 3 O + , and by intercalation of water molecules in the as‐grown NaCoO 2 crystals. The sodium cobalt oxyhydroxide crystals had spherical nanopores with diameters of ~5 nm.