Enhanced spectral emissivity of CeO2 coating with cauliflower-like microstructure

► Cauliflower-like microstructured CeO2 coating is prepared on Ni based substrate. ► The infrared emissive property at high temperature is investigated. ► Rough CeO2 coating shows high emissivity, that is, 0.9 at 873 K and 0.87 at 1073 K. ► The emissivity enhancement mechanisms for the rough CeO2 coating are discussed.