Magnetic field effects on the mass transport at small electrodes studied by voltammetry and magnetohydrodynamic impedance measurements

Peipmann, Ralf; Lange, R.; Kubeil, Clemens; Mutschke, Gerd; Bund, Andreas

doi:10.1016/j.electacta.2010.09.033

Cited by 16 publications

(7 citation statements)

References 10 publications

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“…Thus, the applied magnetic field brings significant change on composition and morphology, and hence the properties of electrodeposited coatings. It was observed that the effect of magnetic field is more prominent when it is superimposed parallel to the deposit plane of an electrode surface (perpendicular to the direction of flow of ions under the electric field) . Further, it was observed that magnetoelectrolysis is found to enhance the surface smoothness of the electrodeposit. , The morphology and phase structure of Zn–Fe alloys can be altered significantly when they are electroplated in the presence of external magnetic field, B .…”

Section: Introductionmentioning

confidence: 99%

Magnetically Induced Codeposition of Ni–Cd Alloy Coatings for Better Corrosion Protection

Rao

Hegde

2014

Ind. Eng. Chem. Res.

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The effects of applied magnetic field, B (both parallel and perpendicular) during process of electrodeposition of Ni–Cd alloy coating on mild steel from a newly proposed electrolytic bath have been studied by using X-ray diffraction (XRD), energy-dispersive X-ray (EDX), and scanning electron microscopy (SEM) analysis. Both parallel and perpendicular B reduced the corrosion rates (CRs); however, the effect is more pronounced in case of perpendicular B. Progressive decrease of CR with increase in the intensity of B showed that corrosion protection efficacy bears close relation with changed composition and crystallographic orientation of the coatings. Under optimal condition, Ni–Cd coating deposited at 0.8 T (perpendicular) was found to be 35 times less corrosive than the conventional Ni–Cd coating (B = 0 T) deposited from the same bath for same time. The effect of B on thickness, microhardness, surface morphology, composition, and crystallographic orientation, and hence, the corrosion resistance of the coatings were analyzed in the light of magnetohydrodynamic (MHD) effect.

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Section: Introductionmentioning

confidence: 99%

Magnetically Induced Codeposition of Ni–Cd Alloy Coatings for Better Corrosion Protection

Rao

Hegde

2014

Ind. Eng. Chem. Res.

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“…As a result, change in surface morphology of the coating was observed tremendously in a perpendicular direction magnetic field. The Lorentz force was responsible for increase in mass transfer process towards cathode [43]. This in turn decreases the thickness of diffusion layer towards electrode [44].…”

Section: Sem Studymentioning

confidence: 99%

Effect of Magnetic Field on Corrosion Performance of Ni–Co Alloy Coatings

Shetty

Hegde

2022

J Bio Tribo Corros

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The corrosion protection efficacy of Ni–Co alloy coatings was tried to improve by magnetoelectrodeposition (MED) approach. The magnetic field of varying strength (B) was applied in perpendicular and parallel to the direction of diffusion of metal ions, simultaneously to the process of deposition. The corrosion behaviour of the deposited coatings was studied through electrochemical DC method and results revealed that Magneto-electrodeposited (MED) Ni–Co alloys coatings were found to be more corrosion resistant than their conventionally electrodeposited (ED) counterparts. Moreover, the effect of magnetic field is more pronounced in perpendicular field direction and was explained by Lorentz force. Under optimal condition, MED Ni–Co alloy coating obtained at a magnetic field intensity of B = 0.3 T (Perpendicular) was found to be less prone to corrosion than its ED alloy (B = 0 T) counterpart. The increased limiting current density (iL) of Co2+ ions in turn increases the corrosion resistant properties of MED Ni–Co alloy coatings. The effect of magnetic field on improved corrosion resistance of the deposited coatings have been investigated in terms of their changed surface morphology, composition, phase structure and surface roughness using Scanning electron microscopy (SEM), Energy dispersion spectroscopy (EDS), X-Ray diffraction (XRD) technique and Atomic Force Microscopy (AFM) respectively.

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“…[ 281–283 ] An uneven growth near the cathode surface is taken place due to a locally non‐uniform current distribution in the process of metal electrodeposition, resulting in formation of secondary micro‐MHD vortices around the diffusion layer of a bulge. [ 219,220 ] The micro‐MHD effect can enhance the performance of hard nickel electrodeposits containing alumina nanoparticles when they are pulse‐plated in an external magnetic field, which can be attributed to the effective removal of hydrogen bubbles during electroplating. [ 284 ]…”

Section: Magnetic Field Applications In Metal‐air Batteriesmentioning

confidence: 99%

“…[201] Based on magnetic oxygen enrichment theory, Lorenz force-induced MHD convection enhances the electrochemical reaction and promotes the separation of different gases. [219,220] Oxygen molecules is attracted toward a stronger magnetic field because of its paramagnetic properties that is due to its parallel spins in the electron configuration of a molecule. [216] While nitrogen molecules move in the opposite direction to oxygen molecules under the action of magnetic field, because its macroscopic magnetic moment is opposite to the direction of magnetic field due to its diamagnetism.…”

Section: Internal Magnetic Fieldmentioning

confidence: 99%

Magnetoelectric Coupling for Metal–Air Batteries

Wang

Zuo

et al. 2022

Adv Funct Materials

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Metal–air batteries have become one of the new potential sources of electrochemical energy due to the excellent electrochemical characteristics, environmental friendliness and cheap cost. Whereas, the commercialization of the metal–air batteries is still subject to the sluggish kinetics on air electrode and hydrogen evolution corrosion as well as dendrite growth of metal anode. Recently, the applied magnetic field, as a technology for transferring energy across physical space, receives more attention, can improve the performance of metal–air batteries by promoting mass transfer, accelerating charge transfer and enhancing electrocatalytic ability based on magnetohydrodynamic effect, Kelvin force effect, Hall effect, Spin selectivity effect, Maxwell stress effect and Magnetothermal effect. This review provides the recent progress in the research on the relative mechanism and characteristic of the magnetic field in the metal–air batteries.

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Magnetic field effects on the mass transport at small electrodes studied by voltammetry and magnetohydrodynamic impedance measurements

Cited by 16 publications

References 10 publications

Magnetically Induced Codeposition of Ni–Cd Alloy Coatings for Better Corrosion Protection

Magnetically Induced Codeposition of Ni–Cd Alloy Coatings for Better Corrosion Protection

Effect of Magnetic Field on Corrosion Performance of Ni–Co Alloy Coatings

Magnetoelectric Coupling for Metal–Air Batteries

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