Electrocatalytic and pseudocapacitive properties of cobalt (hydro)oxide films on sintered metal fiber filter

Abstract

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 a-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 Co 3 O 4 films derived from nitrate bath.

Surfactant Intercalated Mono‐metallic Cobalt Hydrotalcite: Preparation, Characterization, and its Bi‐functional Electrocatalytic Application

“…In particular, the use of organic anions trimesic acid is not effectively intercalated which is evident from the additional peak that appears around 2θ value of 13.9°and may be due to acetate ion deposited in the interlayer and present as cobalt acetate impurities. [21] Further, the results of N 2 adsorption-desorption analysis are displayed in Figure 3 and data are summarized in Table 1. Pure α-Co(OH) 2 showed a weak adsorption with H4-type hysteresis according to IUPAC, [22] corresponding to narrow slit-like pores present in the interlayer spacing of α-Co(OH) 2 .…”