The electrochemical behaviour of nanocrystalline nickel: A comparison with polycrystalline nickel under the same experimental condition

Grubač, Zoran; Petrović, Željka; Katić, Jozefina; Metikoš‐Huković, Mirjana; Babić, Ranko

doi:10.1016/j.jelechem.2010.04.018

Cited by 30 publications

(16 citation statements)

References 47 publications

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“…Electrochemical behavior of Ni electrode in an alkaline solution is in detail described in our previous work. [14] Briefly, an anodic current peak A1 corresponds to both the Ni | α-Ni(OH)2 transition and hydrogen oxidation. An abrupt increase in the anodic current density at higher anodic potentials and appearance of the current peak A2 are due to the formation of a higher valent nickel oxide, the NiOOH-type species.…”

Section: Cyclic Voltammetrymentioning

confidence: 99%

Electrocatalytic Activity of the Ni57.3Co42.7 Alloy for the Hydrogen Evolution

Grubač¹,

Sesar²

2017

Croat. Chem. Acta

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Abstract:The hydrogen evolution reaction (HER) on Ni57.3Co42.7 alloy and its main components, polycrystalline nickel and cobalt was investigated in 1.0 mol L -1 NaOH solution at 20 °C using cyclic voltammetry, pseudo-steady-state linear polarization and electrochemical impedance spectroscopy methods. The purpose of investigation was to evaluate the effect of cobalt on the intrinsic catalytic activity of nickel. Cyclic voltammetry measurements, performed in a wide potential range from hydrogen to oxygen evolution, clearly showed the potential range of formation and reduction metal oxides / hydroxides. Electrocatalytic activity of the investigated electrodes was derived from pseudo-steadystate linear polarization curves, Tafel plots and electrochemical impedance spectroscopy (EIS). Electrochemical impedance spectra obtained in potential range of hydrogen evolution were modeled with modified Randles electric equivalent circuit. Kinetic parameters (the exchange current density and the cathodic Tafel slope), determined from linear polarization measurements and electrochemical impedance measurements, were compared for all three electrode materials. Ni57.3Co42.7 catalyst has shown better electrocatalytic activity compared with pure Co. The main pathway for the HER at investigated electrode materials is Volmer-Heyrovski with Heyrovsky as the rate determining step.

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Section: Cyclic Voltammetrymentioning

confidence: 99%

Electrocatalytic Activity of the Ni57.3Co42.7 Alloy for the Hydrogen Evolution

Grubač¹,

Sesar²

2017

Croat. Chem. Acta

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“…In this equivalent circuit, R S represents the electrolyte resistance, CPE 1 is related to the capacitance of the passive film/electrolyte interface, R 1 corresponds to the charge transfer resistance at that interface and Z WS is a Warburg impedance, which has been used to interpret the transport of vacancies within the passive film, in the frame of the Point Defect Model [42][43][44]. The Warburg impedance used here models dimensional diffusion through a layer of finite thickness with absorbing boundary condition [45,46]:…”

Section: Eis Measurements At An Applied Anodic Potentialmentioning

confidence: 99%

Effect of Volcano-Polluted Seawater on the Corrosion Behaviour of Different Alloys

Sánchez-Tovar¹,

Fernández‐Domene²,

Garcı́a³

et al. 2016

Updates in Volcanology - From Volcano Modelling to Volcano Geology

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During a subsea volcano eruption, gases and thermal water emissions are released. This might change the behaviour of the materials that are in contact with the seawater caused by the decrease of the pH value. For this reason, the materials for marine applications are selected to maintain the integrity of the structure and to be corrosion resistant. In spite of this, corrosion can cause great damage to marine steel infrastructures such as bridges, wharfs, platforms and pipeline systems. These corrosion problems could be aggravated if the medium is altered, due to volcano emissions, since the resistance of the surface film is influenced by the environmental conditions. Electrochemical techniques are useful to evaluate the corrosion behaviour of different metals and alloys. However, literature regarding the influence of underwater-volcanopolluted seawater on the passivation/corrosion behaviour of stainless steels is scarce. According to this, the objective of the chapter is the evaluation of the influence of an underwater volcano eruption on the corrosion behaviour of different materials that might be used in seawater environments. Electrochemical techniques are applied to evaluate the performance of the different materials when they are immersed in polluted volcano seawater. The results are relevant in the evaluation of natural hazard risk assessments involving critical infrastructures.

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“…For Cu/Ni electrode, the peak at −0.68 V, corresponds to Ni/Ni 2+ oxidation, the transformation of ␣-Ni(OH) 2 to ␤-Ni(OH) 2 takes place between the potential ranges of −0.57-0.34 V [26,52,53]. The peak centered at 0.41 V corresponds to the Ni 2+ /Ni 3+ transition [52,53]. The cathodic peak at 0.31 V, corresponds to the Ni 3+ /Ni 2+ reduction.…”

Section: Characterization Of Coatingsmentioning

confidence: 99%

“…There are three anodic peaks at −0.64 V, −0.48 V and 0.45 V also two cathodic peaks at 0.33 V and −0.99 V were observed. The illustrated oxidation reactions are Ni/Ni 2+ and Bi/Bi 3+ at −0.64 V, −0.48 V, respectively [52][53][54][55]. At the forward scan, between the −0.40 and 0.40 V potential ranges, anodic events were illustrated with Bi 3+ /Bi 4 O 7 , Bi 2 O 4 and Bi 2 O 5 transitions [54,55].…”

Section: Characterization Of Coatingsmentioning

confidence: 99%