Applications selon Bauerlé du tracé des diagrammes d’admittance complexe en électrochimie des solides

Schouler, E.J.L.; Kleitz, M.; Déportes, C.

doi:10.1051/jcp/1973700923

Cited by 53 publications

(34 citation statements)

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“…For porous metals, such as platinum, and Lal_xSrxMnO 3 (LSM) perovskite electrodes, the reaction at the cathode is generally considered to proceed mostly through the triple phase boundary. Internal diffusion limiting step has been observed with non porous or molten silver electrodes [3,4,5] and LSM electrodes under large cathodic polarization [6,7].…”

Section: Introductionmentioning

confidence: 99%

Ideal behavior of a thin layer of La0.7Sr0.3CoO3−δ

Ringuedé

Guindet

1997

Ionics

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Abstract. Thin layers of La0.TSr0.3CoO3_ 5 (LSC) were deposited by RF Magnetron Sputtering on Yttria-Stabilized-Zirconia (YSZ) at low temperature. The electrochemical behavior was studied by impedance spectroscopy at equilibrium. The diagrams obtained were separated into a high frequency semi-circle and a finite diffusion characteristic. The diffusion and concentration parameters extracted from these diagrams allowed us to deduce the oxide vacancy concentration and the corresponding diffusion coefficient. Up to 530 ~ no interfacial chemical reactions interfere with the diffusion behavior. The diffusion parameters are compared to the literature data. The results confirm that the internal diffusion electrode mechanism can be implemented and that the cobaltite can be an excellent electrode material at reduced temperature.

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Section: Introductionmentioning

confidence: 99%

Ideal behavior of a thin layer of La0.7Sr0.3CoO3−δ

Ringuedé

Guindet

1997

Ionics

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“…The equivalent electric circuit consisting of ZC,,E in parallel with R,~ is known to have a similar response. E. Schouler [5] for the cell (2) and B.L. Kuzin [6] for the electrochemical cell with 02.-solid electrolyte, which had Ni electrodes in the H2+H20 atmosphere, confirmed this shape of the Nyquist plot.…”

Section: Introductionmentioning

confidence: 70%

Evaluation of the electrical capacitance of M,O2/O2− interfaces (M=Pt, Au, Pd, In2O3; O2− = zirconia based electrolyte) exhibiting constant phase element behavior

Kuzin

Бронин

2001

Ionics

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Abstract. The behavior of the electrode systems M,O2/O 2 (M = porous Pd, Pt, A and den~ ln20~ ; 0 2. = ZrO2-based single-crystal solid electrolyte) was studied by means of impedance measurements. The examination of the Pt,O2/O 2 electrode system showed that the constant phase element (CPE) can be attributed to a nonuniform distribution of current at the electrode surface. It was observed that the CPE parameters n and B in the expression YCPE = B ( j03 )" may be related by B = (Cd0" (R~2) "~ ,where Cd~ is the double layer capacitance and Rn the resistance of the electrolyte in the cell. Then, Cj~ of the electrode -electrolyte interface could be determined. The specific Cd~ of the oxidized noble metals and india electrodes is nearly one order of magnitude lower than Ca~ of the electrodes in the metallic state. The Cd~ value of all the electrodes studied depends little or is independent of temperature and oxygen pressure. It is concluded that the Helmholtz model of double layer structure does not contradict the Cjj behavior.

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“…Various studies [8,13,14] have shown that continuous siliceous phases suppress grain growth resulting in small grain-sizes and larger grain-boundary volume fraction (smaller grain volume fraction). Moreover, these impurities provide a blocking layer within the grain-boundary system that makes the grain-boundary region less conductive.…”

Section: Conductivitymentioning

confidence: 99%

Stable High Conductivity Bilayered Electrolytes for Low Temperature Solid Oxide Fuel Cells

Wachsman¹,

Duncan²

2002

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A bilayer electrolyte consisting of acceptor-doped ceria (on the fuel/reducing side) and cubicstabilized bismuth oxide (on the oxidizing side) was developed. The bilayer electrolyte that was developed showed significant improvement in open-circuit potential versus a typical ceria based SOFC. Moreover, the OCP of the bilayer cells increased as the thickness of the bismuth oxide layer increased relative to the ceria layer. Thereby, verifying the bilayer concept. Although, because of the absence of a suitable cathode (a problem we are still working assiduously to solve), we were unable to obtain power density curves, our modeling work predicts a reduction in electrolyte area specific resistance of two orders of magnitude over cubic-stabilized zirconia and projects a maximum power density of 9 W/m 2 at 800 °C and 0.09 W/m 2 at 500 °C.Towards the development of the bilayer electrolyte other significant strides were made. Among these were, first, the development of a, bismuth oxide based, oxide ion conductor with the highest conductivity (0.56 S/cm at 800 °C and 0.043 S/cm at 500 °C) known to date. Second, a physical model of the defect transport mechanisms and the driving forces for the ordering phenomena in bismuth oxide and other fluorite systems was developed. Third, a model for point defect transport in oxide mixed ionic-electronic conductors was developed, without the typical assumption of a uniform distribution of ions and including the effect of variable loads on the transport properties of an SOFC (with either a single or bilayer electrolyte).i CONTENTS

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Applications selon Bauerlé du tracé des diagrammes d’admittance complexe en électrochimie des solides

Cited by 53 publications

References 0 publications

Ideal behavior of a thin layer of La0.7Sr0.3CoO3−δ

Ideal behavior of a thin layer of La0.7Sr0.3CoO3−δ

Evaluation of the electrical capacitance of M,O2/O2− interfaces (M=Pt, Au, Pd, In2O3; O2− = zirconia based electrolyte) exhibiting constant phase element behavior

Stable High Conductivity Bilayered Electrolytes for Low Temperature Solid Oxide Fuel Cells

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