One-Dimensional Arrays of Co3O4 Nanoparticles: Synthesis, Characterization, and Optical and Electrochemical Properties

One-dimensional arrays of Co 3 O 4 nanoparticles were obtained via the thermal treatment of cobalt oxalate nanorods, which were synthesized through a convenient solvothermal route. The optical properties of Co 3 O 4 nanoparticles were investigated. The optical absorption spectrum indicates that the direct band gaps of Co 3 O 4 nanoparticles are 1.52 and 2.01 eV. The galvanostatic experiment shows the excellent electrochemical performance between 3.0 and 0.2 V.