Cobalt hydroxide films on AISI 304 stainless steel were prepared using the electrochemical deposition from neutral cobalt acetate solutions under galvanostatic conditions. The obtained films were characterized using X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy and thermal analysis. It was established that as-deposited films consisted of α-modification with intercalated CH3COO- ions. The lamellar morphology of cobalt hydroxide film was retained in Co3O4 films obtained after the initial cobalt hydroxide film thermal treatment at 673 K. Electrochemical oxidation of as-deposited hydroxide films led to the formation of black oxohydroxide film, CoO(OH).http://dx.doi.org/10.5755/j01.ms.17.3.586

Cobalt (hydro)oxide films on AISI 304 stainless steel and sintered metal fibre filter Bekipor ST 20AL3 were prepared using electrochemical deposition from neutral cobalt acetate solutions under galvanostatic conditions. Deposited films were structurally characterized using X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy. All electrochemical measurements were performed in aqueous NaOH solution. Capacitive behavior of different films was evaluated using cyclic voltammetry data. The highest specific capacitance (965 F g⁻¹) was reached when Bekipor ST 20AL3 mesh was used as a support for electroactive substance.

Cobalt (hydro)oxide films on Bekipor ST 20AL3 sintered metal fiber were formed by electrochemical deposition under galvanostatic conditions using different electrolyte baths (nitrate, acetate and chloride). Cobalt oxide films were prepared via thermal treatment of as-deposited specimens at 673 K. Electroactive surface area of as-deposited and annealed films was estimated using oxidation–reduction system containing ferricyanide/ferrocyanide. Electrocatalytic and pseudocapacitive properties of the prepared films were investigated using 0.1 M NaOH aqueous solutions. The maximum specific capacitance of 1324 F g⁻¹ was observed for α-Co(OH)₂ films electrodeposited from nitrate-containing electrolyte. Similarly, the highest electrocatalytic activity and stability in oxygen evolution reaction (OER) was determined to be characteristic for Co₃O₄ films derived from nitrate bath.