Electrochemical preparation and properties of nanostructured Co3O4 as supercapacitor material

Abstract

Nanostructured Co 3 O 4 was prepared via a simple two-step process: cathodic electrodeposition of cobalt hydroxide from additive free nitrate bath and then heat treatment at 400°C for 3 h. The prepared oxide product was characterized by powder X-ray diffraction, infrared spectroscopy, surface area measurement, scanning electron microscopy, and transmission electron microscopy. Morphological characterization showed that the oxide product was composed of porous nanoplates, and BET measurement displayed that the oxide plates have the average pore diameter and the surface area of 4.75 nm and 208.5 m 2 g -1 , respectively. The supercapacitive performance of the nanoplates was evaluated using cyclic voltammetry and charge-discharge tests. A specific capacitance as high as 393.6 F g -1 at the constant current density of 1 A g -1 and an excellent capacity retention (96.5% after 500 charge-discharge cycles) was obtained. These results indicate that Co 3 O 4 nanoplates can be recognized as high-performance electrode materials.

Preparation of electrospun Co3O4 nanofibers as electrode material for high performance asymmetric supercapacitors

“…2 [31][32][33]. Therefore, the formation of single phase crystalline Co 3 O 4 nanofibers is in pure phase.…”

Composite Electrodes Made from Carbon Cloth as Supercapacitor Material and Manganese and Cobalt Oxide as Battery One

“…One peak at a voltage close to that observed in our sample, the other peak at higher voltage, ca. 0.3-0.4 V. 43,[58][59][60]63 Looking for the latter redox peak, the CV was extended to higher voltages but decomposition of water above 0.2 V prevented us the observation of this high voltage peak. The CV of the samples having the two oxides (samples MnCo50, MnCo and CoMn) show two redox peaks coming up from the two redox peaks of Mn oxide and the one redox peak of Co oxide, the latter overlapping with one of the Mn oxide peak.…”

“…44 This compound is a p-type semiconductor and shows an electrical conductivity of the order of 10 −3 S cm −1 , 45 which is much higher than the electrical conductivity of MnO 2 · xH 2 O. 3 The Co oxide has been prepared by chemical 43,[47][48][49][50][51][52] or electrochemical route 42,[53][54][55][56][57][58][59][60][61][62][63] on several substrates, usually metallic substrates. Regarding the two oxides together, there * Electrochemical Society Member.…”

Highly active 3-dimensional cobalt oxide nanostructures on the flexible carbon substrates for enzymeless glucose sensing

“…with a lattice constant of 8.084 Å and there are no residual other impurity phase peaks found in the sample. 54,55 Therefore, the formation of both nanocrystalline 3D/Co 3 O 4 nanowires and thorn-like nanostructures was in the high-pure phase.…”