摘要
This paper describes the synthesis of （x-phase Co-Ni hydroxides hexagonal platelets through homo- geneous precipitation, using hexamethylenetetramine （HMT） or urea as a hydrolytic agent. In the CoC12-NiC12-HMT system, pure β-phase can be synthesized at the concentrations of both metal ions higher than 20 raM, 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.
This paper describes the synthesis of （x-phase Co-Ni hydroxides hexagonal platelets through homo- geneous precipitation, using hexamethylenetetramine （HMT） or urea as a hydrolytic agent. In the CoC12-NiC12-HMT system, pure β-phase can be synthesized at the concentrations of both metal ions higher than 20 raM, 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.
基金
financial support from the Natural Science Foundation of Ningbo(Grant Nos.2009A610046,2011A610201)
