An aqueous solution was prepared by dissolving the appropriate amount of NiCl2*6H2O or/and CoCl2*6H2O 8 ml hydrazine hydrate (N2H4.H2O, 99%) was added under constant stirring for 30 min. The mixture was transferred to a stainless Teflon-lined 100 mL autoclave, and heated at 140 degC for 12 h. After cooling to room temperature, the products were filtered off, washed with distilled water and absolute ethanol several times, and then dried in vacuum at 50 degC for 3 h.
hydrazine hydrate (N2H4.H2O
added
8 ml
ml
hydrazine hydrate (N2H4.H2O
added
99%
%
hydrazine hydrate (N2H4.H2O
stirring
30 min
min
autoclave
100 mL
mL
mixture
heated
140 degC
degC
mixture
heated
12 h
h
products
dried
50 degC
degC
products
dried
3 h
h