Electrical double layer in solid electrolytes—theory: oxide electrolytes

Chebotin, V.N.; Remez, I. D.; Solovieva, L.M.; Karpachev, S.V.

doi:10.1016/0013-4686(84)87016-4

Cited by 21 publications

(14 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The observed potential dependence of the apparent double layer capacitance is in the opposite direction compared with the results obtained by Chebotin et al [30]. In that study the electric double layer capacitance was determined by impedance measurements with a liquid metal electrode in an oxygen free atmosphere.…”

Section: Xsupporting

confidence: 49%

Electrode polarization at the Au, O2 (g) / yttria stabilized zirconia interface. Part II: electrochemical measurements and analysis

1991

View full text Add to dashboard Cite

The impedance of the Au,O,(g)/yttria stabilized zirconia interface has been measured as function of the overpotential, temperature and oxygen partial pressure. At large cathodic overpotentials (vi -0. I V) and large anodic overpotentials (7~ +O. I V) inductive effects are observed in the impedance diagram at low frequencies. Those inductive effects result from a charge transfer mechanism where a stepwise transfer of electrons towards adsorbed oxygen species occurs. A model analysis shows that the inductive effects at cathodic overpotentials appear when the fraction of coverage of one of the intermediates increases with more negative cathodic overpotentials.The steady state current-voltage characteristics can be analyzed with a Butler-Volmer type of equation. The apparent cathodic charge transfer coefficient is close to 01, =0.5 and the apparent anodic charge transfer coefficient varies between I .7 < (Y, -C 2.8. The logarithm of the equilibrium exchange current density ( lo ) shows a positive dependence on the logarithm ofthe oxygen partial pressure with a slope of m = (0.602 0.02). Both the apparent cathodic charge transfer coefficient and the oxygen partial pressure dependence of I,, are in accordance with a reaction model where a competition exists between charge transfer and mass transport of molecular adsorbed oxygen species along the electrode/solid electrolyte interface. The apparent anodic charge transfer coefficients deviate from the model prediction.

show abstract

Section: Xsupporting

confidence: 49%

Electrode polarization at the Au, O2 (g) / yttria stabilized zirconia interface. Part II: electrochemical measurements and analysis

1991

View full text Add to dashboard Cite

show abstract

“…This is also valid for the contact surface between solid electrolyte and metal electrode, where defect concentrations may exceed few times the concentration in the volume. 49 Thus, the strongest signal we detect is, we believe, due to surface oxide ions from the regular sublattice but bound stronger compared to the ions in the volume of the crystal. Also the contribution of the species at BE 3 (adsorbed species) is significant.…”

Section: Oxygen 1s Peakmentioning

confidence: 62%

Electrochemical activation of molecular nitrogen at the Ir/YSZ interface

Valov

Luerßen

Mutoro

et al. 2011

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

Nitrogen is often used as an inert background atmosphere in solid state studies of electrode and reaction kinetics, of solid state studies of transport phenomena, and in applications e.g. solid oxide fuel cells (SOFC), sensors and membranes. Thus, chemical and electrochemical reactions of oxides related to or with dinitrogen are not supposed and in general not considered. We demonstrate by a steady state electrochemical polarisation experiments complemented with in situ photoelectron spectroscopy (XPS) that at a temperature of 450 1C dinitrogen can be electrochemically activated at the three phase boundary between N 2 , a metal microelectrode and one of the most widely used solid oxide electrolytes-yttria stabilized zirconia (YSZ)-at potentials more negative than E = À1.25 V. The process is neither related to a reduction of the electrolyte nor to an adsorption process or a purely chemical reaction but is electrochemical in nature. Only at potentials more negative than E = À2 V did new components of Zr 3d and Y 3d signals with a lower formal charge appear, thus indicating electrochemical reduction of the electrolyte matrix. Theoretical model calculations suggest the presence of anionic intermediates with delocalized electrons at the electrode/electrolyte reaction interface. The ex situ SIMS analysis confirmed that nitrogen is incorporated and migrates into the electrolyte beneath the electrode.

show abstract

“…The capacitance, C DL , might be in general related to the differential double-layer capacitance at the electrode/electrolyte interface. Values reported for this capacitance at the Pt/YSZ interface 23,24 and for Au electrodes on YSZ single crystals 25 are 0.5-14 F cm Ϫ2 and 20-40 F cm Ϫ2 , respectively, and thus, in the same order of magnitude as the values for C DL . Considering additionally the rough and inhomogeneous structure of the Ni-YSZ cermet electrodes close to the solid electrolyte, C DL may be related to the double-layer capacitance in the Ni-YSZ/YSZ system.…”

Section: Impedance Modelmentioning

confidence: 85%

Reaction of Hydrogen/Water Mixtures on Nickel‐Zirconia Cermet Electrodes: II. AC Polarization Characteristics

Holtappels

Vinke

Haart

et al. 1999

J. Electrochem. Soc.

109

View full text Add to dashboard Cite

For investigating the dynamics of electrochemical reactions, impedance spectroscopy proves to be a powerful tool in determining the number and kind of processes involved in the interfacial reaction. 1 The interpretation of the impedance spectra needs to separate complex contributions of non-faradaic processes, e.g., the charging of the electrochemical double layer, from contributions of the electrochemical reaction, which is the faradaic impedance, 2 Z F . The faradaic impedance can give information on the processes involved in the electrochemical reaction.Impedance spectra reported previously for nickel-zirconia (Ni-YSZ) cermet electrodes are rather complex and, obviously, influenced by more than one process. [3][4][5][6][7][8] The influence of the cermet preparation and structure 3-6 as well as contributions of the gas atmosphere above the cermet electrode have been investigated. 7 Mechanistic models have also been proposed and correlated to the impedance data. [8][9][10] The results are, however, not always fully understood, but they indicate a complex correlation between preparation, structure, and prehistory of the Ni-YSZ cermet electrode, the experimental setup, and the corresponding impedance. The study of these relationships might be complicated by the fact that complex electrochemical kinetics have been suggested for the hydrogen/water reaction at even simpler shaped Nicone electrodes. 11 In this work, impedance data are presented for a single kind of Ni-YSZ cermet electrodes, which have been characterized by dc measurements. The dc polarization characteristics are described in Part I 12 and indicate different electrochemical kinetics for the hydrogen oxidation and the hydrogen evolution reaction. A chargetransfer controlled reaction rate was concluded for the hydrogen oxidation reaction in the temperature range from 725 to 845ЊC. Adsorption was indicated for this reaction at temperatures above 890ЊC and might affect the hydrogen evolution reaction as well. Based on these results and literature data for the Ni/YSZ system, a model is developed describing possible processes in the investigated Ni-YSZ cermet electrodes. ExperimentalThe electrodes consist of annular-shaped Ni-YSZ cermet and La(Sr)MnO 3 perovskite electrodes screen-printed as symmetrically as possible on each side of 150 m thick electrolyte disks. Zirconia stabilized with 8 mol % yttria (8YSZ) was used as the electrolyte and as the ceramic phase in the Ni-YSZ cermet electrodes. The inner and outer diameters of the electrodes were 4 and 12 mm, respectively, giving a geometric area of 1 cm 2 . Pt mesh current collectors were pressed in contact to the electrodes. A spring-loaded Pt point contact in the center of the cathode served as the reference electrode. The experimental setup has been described previously. 12 The reliability of this cell design in dc and ac polarization measurements has been verified by modeling of the cell current-potential distribution considering the in-plane conductivity, the sloping edges, and the electrochemical prope...

show abstract

Electrical double layer in solid electrolytes—theory: oxide electrolytes

Cited by 21 publications

References 4 publications

Electrode polarization at the Au, O2 (g) / yttria stabilized zirconia interface. Part II: electrochemical measurements and analysis

Electrode polarization at the Au, O2 (g) / yttria stabilized zirconia interface. Part II: electrochemical measurements and analysis

Electrochemical activation of molecular nitrogen at the Ir/YSZ interface

Reaction of Hydrogen/Water Mixtures on Nickel‐Zirconia Cermet Electrodes: II. AC Polarization Characteristics

Contact Info

Product

Resources

About