Template-assisted synthesis of Ni–Co bimetallic nanowires for urea electrocatalytic oxidation

Abstract

Nickel-cobalt bimetallic nanowire electrocatalyts (NCNE), synthesized through anodic aluminium oxide templates, were evaluated for urea electro-oxidation in alkaline medium for their applications in wastewater remediation, hydrogen production, and fuel cells. Compared to bulk nickel film electrocatalysts (NFE), the NCNE resulted in a ca. 110 mV decrease in the overpotential of urea electro-oxidation. In addition, the NCNE exhibited higher oxidation current density and current efficiency for urea electrolysis than those of NFE and nickel-cobalt bimetallic film electrocatalysts (NCFE). The maximum current efficiency for urea electro-oxidation on the NCNE reached up to 81 %, which is *25 % higher than those of the NFE and NCFE.

Heterostructured Nickel‐Cobalt Selenide Immobilized onto Porous Carbon Frameworks as an Advanced Anode Material for Urea Electrocatalysis

“…As shown in Figure B, well‐defined peaks of urea electrooxidation can be observed and both anodic and cathodic currents exhibit a linear dependency upon the square root of the scan rate manifesting that the UOR on the catalyst exposure was a diffusion‐controlled process, which agrees well the Randles‐Sevcik model . This observation suggests that the electrooxidation of urea on Ni−Co−Se/CNT modified electrode is a mixed control reaction . The point to remember is that the condition of working electrode surface can significantly influence the electron transfer kinetics .…”

Hollow Sodium Nickel Fluoride Nanocubes Deposited MWCNT as An Efficient Electrocatalyst for Urea Oxidation

“…Several materials, including noble and non-noble metals, metal oxides, and metal hydroxides, have been investigated as catalysts in the oxidation of urea [11,13,[18][19][20][21][22][23][24][25][26][27][28][29][30]. Ni was found to be the most favorable for electro-oxidation of urea [10].…”

Unusual Effect of Trace Water on the Structure and Activity of NixCo1−x Electrocatalysts for the Methanol Oxidation Reaction

“…[57] Although cobalt does not have the effect of oxidizing methanol (blue curve in Figure 5a), it still plays an important role in Ni x Co 1Àx .F irst, the conductivity of Co(OH) 2 in solution is better than that of Ni(OH) 2 ,w hich is beneficialt o electron transport. [64] Additionally, absorption of CO and the intermediate products on cobalt can greatly facilitate their furthero xidation by Ni 3 + and decrease the CO poisoningo f Ni. [63] Figure 5b shows the cyclic voltammograms in the 0-0.60 V voltager ange and at variouss can rates for the Ni 0.6 Co 0.4 electrode in 0.50 m NaOH medium.…”