Effect of Interfacial Resistance on Determination of Transport Properties of Mixed‐Conducting Electrolytes

Liu, Meilin; Hu, Hongxing

doi:10.1149/1.1836892

Cited by 123 publications

(90 citation statements)

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“…That is, in general, the measurement of OCV cannot be used to determine the ionic or the electronic transference numbers of the material. This conclusion is similar to the one arrived at by Liu and Hu, who evaluated the effect of interfacial polarization on the apparent transference numbers of MIEC materials [19]. The effect of interfacial resistance on the apparent transference numbers in MIEC materials has also been examined by Kharton and Marques [20].…”

Section: Resultssupporting

confidence: 83%

“…Figure 17 shows a typical arrangement. Then, in order to investigate electrode kinetics at the working electrode, which may be a prospective cathode for SOFC, a DC voltage is applied across the working and the counter electrodes 19 . Both current through the cell and voltage across the working and reference electrodes are measured as functions of the applied voltage.…”

Section: >>mentioning

confidence: 99%

“…Let us consider this case first. Equation (78) then becomes 19 In many experimental procedures, the instrument is operated in such a mode so as to only track the voltage between the working and the reference electrodes, and little attention is paid to the actual voltage between the working and the counter electrodes. It is to be emphasized that from the standpoint of electrolyte stability and the present discussion, it is important to know the actual applied voltage, which is between the working and the counter electrodes.…”

Section: >>mentioning

confidence: 99%

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Active Cathodes for Super-High Power Density Solid Oxide Fuel Cells Through Space Charge Effects

Virkar¹

2005

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This report summarizes the work done during the eighth quarter of the project. Effort was devoted towards completing the work on theoretical analysis of oxygen transport through mixed ionic electronic conductors and predominantly oxygen ion conductors, including the role of interfaces. This formed the basis of the report #6 submitted in May 2004. The theoretical analysis is central to investigations of electrode polarization behavior using the three electrode system. This report includes the manuscript as-submitted to Journal of Power Sources.

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Section: Resultssupporting

confidence: 83%

Section: >>mentioning

confidence: 99%

Section: >>mentioning

confidence: 99%

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Active Cathodes for Super-High Power Density Solid Oxide Fuel Cells Through Space Charge Effects

Virkar¹

2005

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“…This is because OCVs depend also on the thickness of an electrolyte with partial electronic conductivity (such as SDC under the fuel cell conditions); the thinner the electrolyte, the lower the OCV [17]. Since the electronic conduction in SDC is not negligible under the fuel cell conditions, the interfacial resistances R p of the fuel cells based on SDC are determined with the following equation [18],…”

Section: Open Circuit Voltages (Ocvs)mentioning

confidence: 99%

Sm0.5Sr0.5CoO3 cathodes for low-temperature SOFCs

et al. 2002

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The electrochemical properties of the interfaces between an Sm 0.2 Ce 0.8 O 1.9 (samaria-doped ceria, SDC) electrolyte and porous composite cathodes consisting of Sm 0.5 Sr 0.5 CoO 3 (SSC) and SDC have been investigated in anode-supported single cells at low temperatures (400 -600 jC). The bilayer structures of the SDC electrolyte films (25 Am thick) and the NiO -SDC anode supports were formed by co-pressing and subsequent co-firing at 1350 jC for 5 h. The effect of composition, firing temperature, and microstructure of the composite cathodes on the electrochemical properties is systematically studied. Results indicate that the optimum firing temperature is about 950 jC, whereas the optimum content of SDC electrolyte in the composite cathodes is about 30 wt.%. It is noted that the addition of the proper amount of SDC to SSC dramatically improved the catalytic properties of the interfaces; reducing the interfacial resistance by more than one order of magnitude compared with an SSC cathode without SDC. D

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“…For solid electrolytes, the use of faradaic efficiency and e.m.f, methods is based on the relationship between the electrode polarization resistance in the measuring cells and the apparent ion transference numbers [13][14][15].…”

Section: Ion Transference Number Determination: Experimental and Methmentioning

confidence: 99%

P-Type electronic conduction in CeO2- and LaGaO3-based solid electrolytes

Хартон

Yaremchenko

Viskup

et al. 2002

Ionics

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Abstract.Modifications of the e.m.f, and faradaic efficiency techniques, taking into account electrode polarization in the measuring cells, in combination with the use of electrodes having sufficiently high polarization resistances enable a precise determination of minor electronic contributions to the conductivity of solid electrolytes. These methods were used to determine the ptype conductivity of compositions based on La(Sr)Ga(Mg)O3_s (LSGM) and Ce(Gd)O2.s (CGO) at 900-1270 K. The oxygen ion transference numbers of these materials under oxygen/air gradient vary in the range 0.999-0.970, increasing with decreasing temperature. Substitution of 2 % gadolinium in Ce0.80Gd0.2002.s with praseodymium was found to increase the electron-hole conduction by 2.5 -4 times. At temperatures above 700 K, both the partial oxygen ionic and ptype electronic conductivities of LaGaO3-based phases are higher than those in CGO. The electronhole transport in LSGM tends to increase with the magnesium concentration, while the activation energy is essentially independent of composition. Electronic conduction in CGO and LSGM electrolytes was also found to be influenced by the ceramic microstructure.

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Effect of Interfacial Resistance on Determination of Transport Properties of Mixed‐Conducting Electrolytes

Cited by 123 publications

References 0 publications

Active Cathodes for Super-High Power Density Solid Oxide Fuel Cells Through Space Charge Effects

Active Cathodes for Super-High Power Density Solid Oxide Fuel Cells Through Space Charge Effects

Sm0.5Sr0.5CoO3 cathodes for low-temperature SOFCs

P-Type electronic conduction in CeO2- and LaGaO3-based solid electrolytes

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