Homogeneous precipitation of α-phase Co–Ni hydroxides hexagonal platelets--颗粒学报PARTICUOLOGY

Liu, J., Wang, X., Yao, X., Wang, J., & Liu, Z. (2012). Homogeneous precipitation of α-phase Co–Ni hydroxides hexagonal platelets. Particuology, 10(1), 24–28. https://doi.org/10.1016/j.partic.2011.04.010

Homogeneous precipitation of α-phase Co–Ni hydroxides hexagonal platelets

Juanjuan Liu, Xuyang Wang, Xiayin Yao, Jun Wang, Zhaoping Liu^*

Ningbo Institute of Material Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, China

10.1016/j.partic.2011.04.010

Volume 10, Issue 1, February 2012, Pages 24-28

Received 24 February 2011, Revised 26 April 2011, Accepted 29 April 2011, Available online 8 November 2011.

E-mail: liuzp@nimte.ac.cn

Highlights

Abstract

This paper describes the synthesis of α-phase Co–Ni hydroxides hexagonal platelets through homogeneous precipitation, using hexamethylenetetramine (HMT) or urea as a hydrolytic agent. In the CoCl₂–NiCl₂–HMT system, pure α-phase can be synthesized at the concentrations of both metal ions higher than 20 mM, while in the CoCl₂–NiCl₂–urea system, the formation of pure α-phase is independent of the concentrations of the metal ions. When using HMT, monodisperse hexagonal platelets of α-phase Co–Ni hydroxides can be produced in the presence of polyvinylpyrrolidone (PVP). Cyclic voltammogram curve of the hexagonal platelets prepared with HMT demonstrates electrochemical performance superior to that of urea.

Graphical abstract

Keywords

Homogeneous precipitation; α-Phase; Hydrolysis; Hexagonal platelets; Cyclic voltammogram

文章导读