title: Novel tunable hierarchical Ni-Co hydroxide and oxide assembled from two-wheeled units.
abstract: A novel hierarchical Ni-Co hydroxide assembled from two-wheeled units was successfully synthesized via a simple, hydrothermal method through the reaction of nickel salt, cobalt salt and sodium hydroxide, and with a chelating agent (EDA) to control the precipitation rate. The as-synthesized materials were characterized by x-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FTIR), atomic absorption spectrophotometer (AAS) and thermogravimetric analysis (TG). The Ni(2+)/Co(2+) molar ratio R in the initial solution plays an important role to control the morphology of the hierarchical Ni-Co hydroxide. The influence of the EDA concentration, reaction temperature and NaOH concentration on the formation of the hierarchical Ni-Co hydroxide was also investigated. The formation mechanism of the hierarchical Ni-Co hydroxide assembled by two-wheeled units was proposed. A Ni-Co oxide with a similar structure was obtained by calcination of the as-prepared Ni-Co hydroxide.
authors.affiliation: School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, People’s Republic of China.
authors.forename: Hongyi
authors.initials: H
authors.lastname: Gao
authors.forename: Ge
authors.initials: G
authors.lastname: Wang
authors.forename: Mu
authors.initials: M
authors.lastname: Yang
authors.forename: Li
authors.initials: L
authors.lastname: Tan
authors.forename: Jie
authors.initials: J
authors.lastname: Yu