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Anodic Reaction

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Trygve Eidet – 1st expert on this subject based on the ideXlab platform

  • an impedance study of the kinetics and mechanism of the Anodic Reaction on graphite anodes in saturated cryolite alumina melts
    Journal of The Electrochemical Society, 1996
    Co-Authors: A. Kisza, Jomar Thonstad, Trygve Eidet

    Abstract:

    The Anodic Reaction on spectrally pure graphite (SPG) and pyrolytic graphite was studied in the potential range from 1.2 to 1.8 V vs. an aluminium reference electrode in alumina-saturated cryolite melts at 1000°C by means of electrochemical impedance spectroscopy. It has been found that the total electrode Reaction can be interpreted by a two-step two-electron charge-transfer process with an intermediate adsorption. The experimentally recorded impedance spectra were interpreted in terms of an equivalent circuit approach and the kinetic theory of Bai and Conway, giving the double-layer capacitance, electrode coverage, effective rate constants, and the charge needed for the coverage of the electrode by a monolayer. The process is faster on SPG anode, and on both anodes the second step is faster than the first one.

  • An Impedance Study of the Kinetics and Mechanism of the Anodic Reaction on Graphite Anodes in Saturated Cryolite‐Alumina Melts
    Journal of The Electrochemical Society, 1996
    Co-Authors: A. Kisza, Jomar Thonstad, Trygve Eidet

    Abstract:

    The Anodic Reaction on spectrally pure graphite (SPG) and pyrolytic graphite was studied in the potential range from 1.2 to 1.8 V vs. an aluminium reference electrode in alumina-saturated cryolite melts at 1000°C by means of electrochemical impedance spectroscopy. It has been found that the total electrode Reaction can be interpreted by a two-step two-electron charge-transfer process with an intermediate adsorption. The experimentally recorded impedance spectra were interpreted in terms of an equivalent circuit approach and the kinetic theory of Bai and Conway, giving the double-layer capacitance, electrode coverage, effective rate constants, and the charge needed for the coverage of the electrode by a monolayer. The process is faster on SPG anode, and on both anodes the second step is faster than the first one.

A. Kisza – 2nd expert on this subject based on the ideXlab platform

  • Mechanism and kinetics of the Anodic Reaction in cryolite melts. II. The influence of AIF 3 (11 wt%) at different Al2O3 content
    Polish Journal of Chemistry, 2020
    Co-Authors: A. Kisza, Jomar Thonstad, J. Hives

    Abstract:

    Aluminium trifluoride is the main additive to the cryolite-based electrolyte in aluminium electrolysis. By Electrochemical Impedance Spectroscopy (EIS) the influence of AlF3 upon the kinetics and mechanism of the Anodic Reaction in 4 cryolite–alumina melts containing 2, 4, 6 and 8 wt% of alumina and 11 wt% of AlF3 was determined at 1000C. The addition of 11 wt% of AlF3 to a cryolite melt with a certain alumina content increases the overpotential of the Anodic Reaction as compared to cryolite-alumina saturated (CRAS) melt. The Tafel slope increases from around 0.12 V/dec. to 0.24 V/dec., which indicates that at low alumina content the second charge transfer step is the rds, whereas at higher alumina content this control is shifted towards the first step. The effective rate constants of both charge transfer steps are increasing with the alumina content. It can be concluded that the influence of the added AlF3 is directly related to the participation of this reagent in the first charge transfer step, in which it is a product. The diffusion coefficient of the Al2OF 6 2 anionic species decreases as a function of the alumina content, due to the increase of the viscosity of the melts studied.

  • an impedance study of the kinetics and mechanism of the Anodic Reaction on graphite anodes in saturated cryolite alumina melts
    Journal of The Electrochemical Society, 1996
    Co-Authors: A. Kisza, Jomar Thonstad, Trygve Eidet

    Abstract:

    The Anodic Reaction on spectrally pure graphite (SPG) and pyrolytic graphite was studied in the potential range from 1.2 to 1.8 V vs. an aluminium reference electrode in alumina-saturated cryolite melts at 1000°C by means of electrochemical impedance spectroscopy. It has been found that the total electrode Reaction can be interpreted by a two-step two-electron charge-transfer process with an intermediate adsorption. The experimentally recorded impedance spectra were interpreted in terms of an equivalent circuit approach and the kinetic theory of Bai and Conway, giving the double-layer capacitance, electrode coverage, effective rate constants, and the charge needed for the coverage of the electrode by a monolayer. The process is faster on SPG anode, and on both anodes the second step is faster than the first one.

  • An Impedance Study of the Kinetics and Mechanism of the Anodic Reaction on Graphite Anodes in Saturated Cryolite‐Alumina Melts
    Journal of The Electrochemical Society, 1996
    Co-Authors: A. Kisza, Jomar Thonstad, Trygve Eidet

    Abstract:

    The Anodic Reaction on spectrally pure graphite (SPG) and pyrolytic graphite was studied in the potential range from 1.2 to 1.8 V vs. an aluminium reference electrode in alumina-saturated cryolite melts at 1000°C by means of electrochemical impedance spectroscopy. It has been found that the total electrode Reaction can be interpreted by a two-step two-electron charge-transfer process with an intermediate adsorption. The experimentally recorded impedance spectra were interpreted in terms of an equivalent circuit approach and the kinetic theory of Bai and Conway, giving the double-layer capacitance, electrode coverage, effective rate constants, and the charge needed for the coverage of the electrode by a monolayer. The process is faster on SPG anode, and on both anodes the second step is faster than the first one.

Hiromichi Arai – 3rd expert on this subject based on the ideXlab platform

  • effects of anode material and fuel on Anodic Reaction of solid oxide fuel cells
    Journal of The Electrochemical Society, 1992
    Co-Authors: Toshihiko Setoguchi, Kotaro Okamoto, Koichi Eguchi, Hiromichi Arai

    Abstract:

    In this paper, Anodic properties of solid oxide fuel cells are evaluated for several anode/electrolyte systems. Anodic over-voltage of metal/yttria-stabilized zirconia (YSZ) interface was related with metal-oxygen bonding strength and was the smallest for the Ni anode in the present study. The Anodic polarization conductivity of Ni-YSZ cermet/YSZ electrolyte interface strongly depended on oxygen partial pressure P[sub 02], in fuel, but was independent of the kind of fuel (H[sub 2]-H[sub 2]O, CO-CO[sub 2] and CH[sub 4]-H[sub 2]O). The activation of oxygen ion appears to be the rate limiting step in the overall Reaction. The overvoltages of Ni/ and Pt/samaria-doped ceria (SDC) were very small as compared with those of Ni/ and Pt/YSZ. The Anodic properties were also influenced by the oxide material mixed with Ni as a cermet component.