From layered hydroxide compounds to labyrinth-like NiO and Co3O4 porous nanosheets

Layered nickel and cobalt hydroxide compounds have been synthesized via a simple hydrothermal growth method and their chemical formulas are established. Labyrinth-like nickel and cobalt oxide porous sheets were prepared using their layered metal hydroxide compounds as precursors by annealed at 500 °C for 3 h, both of them have stable sheet framework and large pores. The factors of the formation of the novel porous structure were investigated and their catalytic properties have been studied.