Preparation of nanostructured Co–Mo alloy electrodes and investigation of their electrocatalytic activity for hydrazine oxidation in alkaline medium

Abstract

Funding informationOffice of the Vice-Chancellor in charge of research of Sayyed Jamaleddin Asadabadi University Cobalt and cobalt-molybdenum alloy electrodes are prepared by galvanic deposition on copper substrates. In this paper, we report a study on the influence of alloying cobalt with molybdenum for the oxidation of hydrazine in 1 M NaOH aqueous solutions. The electrocatalytic properties of the electrodes are studied by cyclic voltammetry (CV), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS). Scanning electron microscopy (SEM), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS,) and inductively coupled plasma (ICP) analysis demonstrate that the structural features and compositions of the as-prepared Co-Mo coatings vary with the deposition conditions. Electrochemical characterization indicates that the electrochemical properties and the electrocatalytic activity of the investigated alloys were strongly dependent on the microstructural features obtained under different deposition conditions. The overall experimental data indicate that alloying cobalt with molybdenum metal leads to an increase of the electrocatalytic activity in hydrazine electroxidation compared to when using the pure cobalt electrode. High catalytic efficiencies were achieved on Co/25 at.% Mo and Co/33 at.% Mo electrodes, the latter being the best electrocatalyst for hydrazine electroxidation. K E Y W O R D Scyclic voltammetry, electrocatalytic activity, electrochemical impedance spectroscopy, electrodeposition, hydrazine electroxidation, nanostructured Co-Mo

Design of earth‐abundant amorphous transition metal‐based catalysts for electrooxidation of small molecules: Advances and perspectives

“…Controlling the nanostructure of nanocatalysts is a powerful strategy to upgrade the catalytic performance of amorphous TM alloys by providing a large surface area and promoting the penetration/diffusion of electrolytes. 72,73 Porous materials, 74 nanoarrays, 75 pompoms, 19 films, 76 and aerogels 23 have been investigated for ESM. For instance, Xu et al used electrodeposition to load amorphous NiFe nanotubes onto the nickel foam (NiFe NTAs-NF) (Figure 4A).…”

Pure pompon structured Co–Mo alloy electro-deposited from ethylene glycol solution and used as electrocatalysts for hydrogen evolution reaction

“…The distance between the cathode and anode in the plating bath maintain 2 cm. It should be noted that the copper sheet (plating substrate) was also pretreated before plating and the copper sheet coated by Co-Mo deposits was treated after plating based on the previous literatures [31,44]. It should be noted that preparation of Co-Mo deposits and all electrochemical measurements were performed in a glove box with an Ar atmosphere containing less than 2 ppm of oxygen and moisture.…”

“…At present, Co-Mo alloys and its composite materials have been prepared mainly from aqueous solutions [8, 9,12,13,[26][27][28][29][30][31]. For instance, Co-Mo and Co-Mo-C alloys had been successfully prepared by P.R.…”

Archives of Metallurgy and Materials

“…Cobalt and its alloys could replace platinum in the production of electrodes for hydrogen evolution process. In literature one can find several reports about electrodeposition of Co-Ru [1][2][3][4], Co-Mo [5][6][7][8][9] and Co-W [10] alloys and their catalytic activity. Electrochemical deposition of Co-Pd coatings was studied by K. Mech and co-workers [11,12].…”