Cathodic and Anodic Polarization Phenomena at Platinum Electrodes with Doped CeO2 as Electrolyte: I . Steady‐State Overpotential

Wang, Da Yu; Nowick, A. S.

doi:10.1149/1.2129235

Cited by 203 publications

(126 citation statements)

References 2 publications

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“…At high oxygen pressures, the current over-potential curves were found to obey the Butler-Volmer equation which implied a charge transfer (or activation) polarization [28]. Also in this study, it was found that at low oxygen pressure, a limiting-current behaviour resulted which was characteristic of cathodic concentration polarization.…”

Section: Introductionsupporting

confidence: 59%

“…Here O represents the oxidized ~Rg~ species, ne is the number of electrons transferred, and R is the reduced species. This mechanism is modelled [27,28] by the Butler-Volmer equation [30] I (~aF~) (-:~oF~c) ] Je = Jo.e exp RT exp R~ (8) and occurs at the three-phase line and/or at the twophase contact area. In this relation, Jo,e is the exchange current density, e, and ~c are the anodic and cathodic transfer coefficients; r& and r/~ are the anodic and cathodic overpotentials.…”

Section: Rtamentioning

confidence: 99%

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A morphological investigation of electrodes for solid electrolytes

Canaday

Wheat

Haley³

et al. 1989

J Mater Sci

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using the techniques of image analysis, profilometry, gas permeability, mercury porosimetry, and gas adsorption, the morphological properties of porous electrode film (1 to 300/~m) materials are discussed. The materials include platinum paste which is utilized as electrodes for high-temperature oxygen-ion-conducting ZrO 2 electrolytes and for low-temperature solid-state protonic electrolytes. Also considered are plasma-sprayed nickel layers and silver membranes. It is shown that each of the five methods can be used to make quantitative evaluations of film electrodes. The electrode morphological parameters measured include particle diameter, pore diameter, porosity, three-phase line, thickness, surface texture, gas-flow/pressure, pore area, and surface area. A discussion of these properties as they relate to activation and concentration polarization of electrochemical cells is also presented. IntroductionThe morphology of the electrodes used in certain types of electrochemical cells has been known [1-9] to affect the performance of these devices. Of particular interest here is the three-phase cell consisting of a solid (ceramic) electrolyte (in which mobile ionic species migrate or diffuse), porous metal electrodes and reactant gas species. This structure may be compared with two-phase electrochemical cells containing a liquid or solid electrolyte and non-porous metal electrodes.A number of three-phase cells has been under intensive study. The cell with doped ZrO2 [1-9] as the electrolyte is an anionic conductor, having 02 ions as the mobile species. The operating temperatures of this cell is 800 to 1000 ° C. A cationically conducting cell based on the SrCeO3 electrolyte [10-13] also operates in this temperature range and has protons as its mobile species.Two protonic conductors which operate at 25 to 300°C have also been developed. The fl/fl"-A1203 [14][15][16] and Nasicon [17,18] formulations show promise as precursor electrolytes for fuel cells, electrolysers and sensors. In order for these materials to be used in hydrogen cells, it is necessary for the mobile cationic species to be exchanged for hydronium, H30 + , ions. A method for ion-exchanging the precursor material in powder form and then bonding the exchanged powder with an inorganic substance has been developed [19].A number of electrochemical devices have been reported which utilize the hydronium electrolyte;

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Section: Introductionsupporting

confidence: 59%

Section: Rtamentioning

confidence: 99%

A morphological investigation of electrodes for solid electrolytes

Canaday

Wheat

Haley³

et al. 1989

J Mater Sci

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“…Existing models [31,32] describing the oxygen transfer reactions at the YSZ-noble metal interface do not predict inductive loops in the impedance spectra [ 15 ]. In wet electrochemistry these inductive (or negative capacitive) effects are frequently encountered and can be described with a two-step electron transfer model in which the intermediate species compete for adsorption sites [ 33 ].…”

Section: Discussionmentioning

confidence: 99%

Oxygen transfer properties of ion-implanted yttria-stabilized zirconia

1992

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The influence of surface modification by ion implantation on oxygen transfer in yttria-stabilized zirconia (YSZ) has been studied. Implantation of 15 keV 56Fe in YSZ with a maximum dose of 8 X 10 ~6 atoms cm 2 yields reproducible surface layers of approximately 20 nm deep with a maximum Fe cation fraction of 0.5 at the surface. After annealing these layers are stable up to 700-800°C. The exchange current densities for the Fe-implanted layers, measured using porous gold electrodes, are a factor of 10-50 larger than observed for not-implanted YSZ. tsO isotope exchange experiments show that for Fc-implanted samples the surface oxygen exchange rate is at least a factor 30 larger than for normal YSZ. The electrode kinetics has been studied for normal and implanted YSZ using current-overvoltage measurements and impedance measurements under bias. An electrode reaction model for the transfer of oxygen has been developed. This model is able to explain the low frequency inductive loop in the impedance diagram which is observed at high cathodic and anodic polarizations for implanted as well as normal YSZ.

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“…Variety of research groups were involved to reveal the gas electrode kinetics. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] However, in the late 1970s when the author and the co-investigators started studies on the kinetics of solid electrolyte gas electrodes, independent research groups proposed different reaction models and no research group succeeded to explain the performance of fuel cells and chemical sensors under the same theorem.…”

Section: Introductionmentioning

confidence: 99%

Model for Solid Electrolyte Gas Electrode Reaction Kinetics; Key Concepts, Basic Model Construction, Extension of Models, New Experimental Techniques for Model Confirmation, and Future Prospects

Mizusaki

2014

Electrochemistry

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In order to survey history and state of art of theoretical and kinetic studies of gas electrode reaction on solid oxide electrolyte, overview was made on the research works reported by the author and his co-investigators. Through reviewing their works, frontier of research is clarified. It was shown that electrode reaction is controlled by nonfaradaic chemical reaction process, and the nature of the overpotential is the chemical potential deviation of the interface from equilibrium state. Mechanical stress at the electrode/solid electrolyte interface is considered varying with the overpotential. Importance is emphasized for mechano-electrochemistry, the field to study the relationship of electrochemistry and mechanical property of the electrochemical cells.

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Cathodic and Anodic Polarization Phenomena at Platinum Electrodes with Doped CeO2 as Electrolyte: I . Steady‐State Overpotential

Cited by 203 publications

References 2 publications

A morphological investigation of electrodes for solid electrolytes

A morphological investigation of electrodes for solid electrolytes

Oxygen transfer properties of ion-implanted yttria-stabilized zirconia

Model for Solid Electrolyte Gas Electrode Reaction Kinetics; Key Concepts, Basic Model Construction, Extension of Models, New Experimental Techniques for Model Confirmation, and Future Prospects

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