Preparation and Characterization of Copper-Doped Cobalt Oxide Electrodes

Abstract

Cobalt oxide (Co3O4) and copper-doped cobalt oxide (CuxCo(3-x)O4) films have been prepared onto titanium support by the thermal decomposition method. The electrodes have been characterized by different techniques such as cyclic voltammetry, scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy (XPS). The effect on the electrochemical and crystallographic properties and surface morphology of the amount of copper in the oxide layer has been analyzed. The XPS spectra correspond to a characteristic monophasic Cu-Co spinel oxides when x is below 1. However, when the copper content exceeds that for the stoichiometric CuCo2O4 spinel, a new CuO phase segregates at the surface. The analysis of the surface cation distribution indicates that Cu(II) has preference for octahedral sites.

Simple synthesis of yolk-shelled ZnCo2O4 microspheres towards enhancing the electrochemical performance of lithium-ion batteries in conjunction with a sodium carboxymethyl cellulose binder

“…[28]. The Co 2p XPS spectrum in Figure 6(c) consists of two main lines (2p 3/2 at ~780.6 eV and 2p 1/2 at ~795.7 eV) with the spin-orbit splitting of ~15.1 eV, in accordance with the data reported in the literatures [29,30].…”

Electricity generation and bivalent copper reduction as a function of operation time and cathode electrode material in microbial fuel cells

“…4), considerably contributed to the apparent decrease in internal resistance, consistent with previous reports of enhanced surface conductivity by deposited copper in conventional electrochemical processes [14][15][16]. Similarly, the polarization resistance (R p ) and ohmic resistance (R o ) with both SSM and TS cathodes also diminished with copper deposition over time.…”

“…1) and Cu(II) reduction (Fig. 2) [14]. In contrast, the CS cathode was severely corroded, resulting in remarkable sculptures on the surface, even after cycle 1 (Fig.…”

“…Copper is an excellent conductor that interacts with various materials. It promotes enhanced electrocatalytic activity towards oxygen and hydrogen peroxide reduction reactions in conventional electrochemical processes, due to the enlarged surface roughness and to the presence of new active sites [14][15][16]. Films of CuO on stainless steel mesh also exhibit efficient catalytic activities for propene oxidation [17] while copper phthalocyanine performs as platinum catalysis for oxygen reduction reaction in MFCs [18].…”

Pseudomorphic Generation of Supported Catalysts for Glycerol Oxidation

“…This might be due to the experimental conditions, as the local copperc ontent may exceed that for the stoichiometricCuCo 2 O 4 spinel, which would cause segregation of aC uO phase at the surface, as proposed by Vµzquez. [15] Notably,p ure CuO is not detected in materials with lower copper contents (Co/Cu = 4, 8, and 16), which indicates that coppera toms are successfully incorporated in the spinel phase. Thec rystallite sizes of Co x Cu y O 4 with various copper loadings were calculated by using the Scherrere quation;t hey were found to be approximately 9nmf or all mixed oxides.…”