Microbubble Formation from Ionic Vacancies in Copper Anodic Dissolution under a High Magnetic Field

Oshikiri, Yoshinobu; Aogaki, Ryoichi; Miura, Makoto; Sugiyama, Atsushi; Morimoto, Ryoichi; Miura, Masashi; Mogi, Iwao; Yamauchi, Yusuke

doi:10.5796/electrochemistry.83.549

Cited by 15 publications

(18 citation statements)

References 16 publications

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“…Figure 2A exhibits the microbubbles observed in copper electrodeposition under an 8 T vertical magnetic field. Universality of the phenomenon111213 allowed us to conclude that via. nanobubbels, the observed microbubbles arise from ionic vacancies created by electrode reactions.…”

Section: Resultsmentioning

confidence: 98%

“…2B, in the electrolysis under a vertical magnetic field, a tornado-like rotation called vertical MHD flow emerges over electrode surface, of which radial secondary flow gives rise to a collision field for created ionic vacancies at the electrode center, where ionic vacancies collide to yield nanobubbles of the order of 1 nm containing dissolved gas22, and the created nanobubbles are in turn converted to observable microbubbles via. Ostwald ripening111213.…”

Section: Resultsmentioning

confidence: 99%

“…In recent years, under high magnetic fields, microbubbles without electrochemical gas-evolution of hydrogen or oxygen has been continuously found in ferricyanide-ferrocyanide redox reaction11, copper cathodic deposition12 and copper anodic dissolution13. As will be elucidated later, such experimental results are attributed to the production of ionic vacancy in electrode reactions.…”

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confidence: 90%

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Magneto-Dendrite Effect: Copper Electrodeposition under High Magnetic Field

Miura

Oshikiri

Sugiyama

et al. 2017

Sci Rep

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Ionic vacancy is a by-product in electrochemical reaction, composed of polarized free space of the order of 0.1 nm with a 1 s lifetime, and playing key roles in nano-electrochemical processes. However, its chemical nature has not yet been clarified. In copper electrodeposition under a high magnetic field of 15 T, using a new electrode system called cyclotron magnetohydrodynamic (MHD) electrode (CMHDE) composed of a pair of concentric cylindrical electrodes, we have found an extraordinary dendritic growth with a drastic positive potential shift from hydrogen-gas evolution potential. Dendritic deposition is characterized by the co-deposition of hydrogen molecule, but such a positive potential shift makes hydrogen-gas evolution impossible. However, in the high magnetic field, instead of flat deposit, remarkable dendritic growth emerged. By examining the chemical nature of ionic vacancy, it was concluded that ionic vacancy works on the dendrite formation with the extraordinary potential shift.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 90%

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Magneto-Dendrite Effect: Copper Electrodeposition under High Magnetic Field

Miura

Oshikiri

Sugiyama

et al. 2017

Sci Rep

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“…Figure 2 exhibits photos of micro-bubble evolution in ferricyanide-ferrocyanide redox reaction without any electrochemical gas evolution 29 . After this report, the same kinds of photos of micro-bubble evolution have been taken in copper cathodic deposition 30 and copper anodic dissolution 31 . These experimental results obviously inform us that ionic vacancy is a sub-product, generally created in electrode reaction.…”

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confidence: 99%

Lifetime of Ionic Vacancy Created in Redox Electrode Reaction Measured by Cyclotron MHD Electrode

Sugiyama

Morimoto²,

Osaka

et al. 2016

Sci Rep

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The lifetimes of ionic vacancies created in ferricyanide-ferrocyanide redox reaction have been first measured by means of cyclotron magnetohydrodynamic electrode, which is composed of coaxial cylinders partly exposed as electrodes and placed vertically in an electrolytic solution under a vertical magnetic field, so that induced Lorentz force makes ionic vacancies circulate together with the solution along the circumferences. At low magnetic fields, due to low velocities, ionic vacancies once created become extinct on the way of returning, whereas at high magnetic fields, in enhanced velocities, they can come back to their initial birthplaces. Detecting the difference between these two states, we can measure the lifetime of ionic vacancy. As a result, the lifetimes of ionic vacancies created in the oxidation and reduction are the same, and the intrinsic lifetime is 1.25 s, and the formation time of nanobubble from the collision of ionic vacancies is 6.5 ms.

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“…Energy saving, high efficiency, and new functional materials are still the challenges of conventional electrochemical engineering. Metal electrodeposition and gas evolution (such as H 2 , O 2 , and Cl 2 ) are the main electrochemical reactions for electrochemical engineering such as electrometallurgy, functional material preparation, chloralkali electrolysis, and water electrolysis . During metal electrodeposition in aqueous solutions, the hydrogen evolution reaction inevitably occurs.…”

Section: Introductionmentioning

confidence: 99%

Progress toward Electrochemistry Intensified by using Supergravity Fields

Wang

Gong

et al. 2015

ChemElectroChem

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Supergravity fields with high gravity acceleration can promote interphase ship velocity and convection velocity. Over the past decade, research has been devoted to enhancing electrochemical reactions by using supergravity fields. The enhancement of electrochemical reactions is ascribed to the acceleration of mass transfer and bubble separation. In this Minireview, the intensification kinetics of a supergravity field on mass transfer and bubble separation during electrochemical reactions are analyzed theoretically. The progress in terms the enhancement of electrochemical reactions (such as metal electrodeposition, water electrolysis, and chloralkali electrolysis) under a supergravity field is reviewed. The structures and properties of functional films electrodeposited under a supergravity field on both the cathode and the anode are summarized. The Minireview is helpful to understand the effect of the mechanism of the supergravity field on electrochemical reactions and to expand potential applications.

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Microbubble Formation from Ionic Vacancies in Copper Anodic Dissolution under a High Magnetic Field

Cited by 15 publications

References 16 publications

Magneto-Dendrite Effect: Copper Electrodeposition under High Magnetic Field

Magneto-Dendrite Effect: Copper Electrodeposition under High Magnetic Field

Lifetime of Ionic Vacancy Created in Redox Electrode Reaction Measured by Cyclotron MHD Electrode

Progress toward Electrochemistry Intensified by using Supergravity Fields

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