Progress in understanding SOFC electrodes

Mogensen, Mogens Bjerg; Jensen, Karen; Jørgensen, Mette; Primdahl, S.

doi:10.1016/s0167-2738(02)00269-2

Cited by 210 publications

(150 citation statements)

References 17 publications

Supporting

Mentioning

137

Contrasting

Unclassified

Order By: Relevance

“…Even for Ni/YSZ cermet anodes, the mechanism for hydrogen oxidation reactions is not completely understood. For example it has been shown that the rate of this reaction is dependent on water partial pressure with higher pressures resulting in higher reaction rates [8]. The mechanism by which water affects this reaction is currently under discussion, with the speculation that the zirconia surface is hydroxylated.…”

Section: Catalytic Propertiesmentioning

confidence: 99%

Advanced anodes for high-temperature fuel cells

et al. 2004

View full text Add to dashboard Cite

Fuel cells will undoubtedly find widespread use in this new millennium in the conversion of chemical to electrical energy, as they offer very high efficiencies and have unique scalability in electricity generation applications. The solid oxide fuel cell (SOFC) is one of the most exciting of these energy technologies; it is an all-ceramic device that operates at temperatures in the range 500-1000ºC. The SOFC offers certain advantages over lower temperature fuel cells, notably its ability to utilise CO as a fuel rather than being poisoned and the availability of high-grade exhaust heat for combined heat and power or combined cycle gas turbine applications. Although cost is clearly the most important barrier to widespread SOFC implementation, perhaps the most important technical barriers currently being addressed relate to the electrodes, particularly the fuel electrode or anode. In terms of mitigating global warming, the ability of the SOFC to utilise commonly available fuels at high efficiency, promises an effective and early reduction in carbon dioxide emissions and hence is one of the lead new technologies to improve the environment. Herein, we discuss recent developments of SOFC fuel electrodes that will enable the better utilisation of readily available fuels. is an all-ceramic device that operates at temperatures in the range 500-1000 o C. The SOFC offers certain advantages over lower temperature fuel cells, notably its ability to utilise CO as a fuel rather than being poisoned and the availability of high-grade exhaust heat for combined heat and power or combined cycle gas turbine applications. Although cost is clearly the most important barrier to widespread SOFC implementation, perhaps the most important technical barriers currently being addressed relate to the electrodes, particularly the fuel electrode or anode. In terms of mitigating global warming, the ability of the SOFC to utilise commonly available fuels at high efficiency, promises an effective and early reduction in carbon dioxide emissions and hence is one of the lead new technologies to improve the environment.Herein, we discuss recent developments of SOFC fuel electrodes that will enable the better utilisation of readily available fuels.

show abstract

Section: Catalytic Propertiesmentioning

confidence: 99%

Advanced anodes for high-temperature fuel cells

et al. 2004

View full text Add to dashboard Cite

show abstract

“…This leads to numerous substances which are considered to be potential SOFC cathode materials. However, published data often show a lack of agreement [27,28]. Here we try to give an overview of basic principles for choosing an appropriate perovskite material for a specific application.…”

Section: Affecting the Perovskite Propertiesmentioning

confidence: 99%

Materials design for perovskite SOFC cathodes

et al. 2009

View full text Add to dashboard Cite

This article focuses on perovskite materials for application as cathode material in solid oxide fuel cells. In order to develop new promising materials it is helpful to classify already known perovskite materials according to their properties and to identify certain tendencies. Thereby, composition-dependent structural data and materials properties are considered. Structural data under consideration are the Goldschmidt tolerance factor, which describes the stability of perovskites with respect to other structures, and the critical radius and lattice free volume, which are used as geometrical measures of ionic conductivity. These calculations are based on the ionic radii of the constituent ions and their applicability is discussed. A potential map of perovskites as a tool to classify simple ABO 3 perovskite materials according to their electrical conduction behavior is critically reviewed as a structured approach to the search for new cathode materials based on more complex perovskites with A and/or B-site substitutions. This article also covers the approaches used to influence electronic and the ionic conductivity. The advantage of mixed ionic electronic conductors in terms of the oxygen exchange reaction is addressed and their important properties, namely the oxygen-exchange coefficient and the oxygen diffusion coefficient, and their effect on the oxygen reduction reaction are presented.

show abstract

“…These types of cells are manufactured differently from full commercial cells and the microstructure and impurity level of the electrodes are likely to be different from the commercial cell. A direct comparison between the electrode performance of a full commercial cell and a symmetric cell is difficult, since the electrode performance is very sensitive to the microstructure [4,5] and impurities [6].…”

Section: Introductionmentioning

confidence: 99%

Break Down of Losses in Thin Electrolyte SOFCs

et al. 2006

View full text Add to dashboard Cite

The contributions of the individual components of the cell (anode, cathode, and electrolyte) to the cell resistance were determined experimentally, directly from impedance spectra obtained from a full cell. It was an anode supported thin electrolyte cell, consisting of a YSZ electrolyte, a Ni/YSZ cermet anode, and a LSM composite cathode. Additional, qualitative information was obtained using symmetric cells with LSM composite electrodes. The investigations were carried out in the temperature interval from 700 to 850 °C. The electrolyte and anode activation energies obtained were 0.9 and 1.1 eV, respectively, which is in relatively good agreement with literature values. The anode resistance was 0.24 Ω cm2 and the cathode resistance was 0.58 Ω cm2 at 700 °C, corresponding to 23% and 56% of the total resistance, respectively.

show abstract

Progress in understanding SOFC electrodes

Cited by 210 publications

References 17 publications

Advanced anodes for high-temperature fuel cells

Advanced anodes for high-temperature fuel cells

Materials design for perovskite SOFC cathodes

Break Down of Losses in Thin Electrolyte SOFCs

Contact Info

Product

Resources

About