Large-scale synthesis of mesoporous CoO-doped NiO hexagonal nanoplatelets with improved electrochemical performance

Abstract

CoO-doped NiO hexagonal nanoplatelets with mesoporous structure were prepared in large scale through a simple solution method followed by calcination process. A series of characterizations such as X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), field-emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HRTEM) and selected-area electron diffraction (SAED) revealed that incorporation of 1.0 at.% cobalt did not destroy the crystal lattice of NiO, which still kept the single crystalline nature with the top/bottom surfaces oriented along (111) crystal planes. Galvanostatic electrochemical results showed that the CoO-doped mesoporous NiO nanoplatelets exhibited much-improved specific capacity and better reversible stability than that of the pure NiO porous nanoplatelets and CoO-doped NiO microparticles, which could be ascribed to the co-effect of cobalt doping and porous nanostructure.