Effect of calcination temperature on the H2O2 decomposition activity of nano-crystalline Co3O4 prepared by combustion method

► Spinel Co3O4 nano-particles were synthesized by combustion method using urea as a combustion fuel. ► The estimated particle size using both XRD and TEM were in the range 8-34 nm depending upon calcination temperature. ► The H2O2 decomposition over Co3O4 nano-particles was found to decrease with the crystallites sized increase.