Fabrication and performance of gadolinia-doped ceria-based intermediate-temperature solid oxide fuel cells

Zhen, Y. D.; Tok, Alfred Iing Yoong; Jiang, San Ping; Boey, Freddy

doi:10.1016/j.jpowsour.2007.11.113

Cited by 87 publications

(32 citation statements)

References 25 publications

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“…This means that the GDC electrolyte film prepared by the spray coating process can be used as electrolyte for anode-supported SOFC. However, the power densities of the single cell in this study are very lower than those reported in the literatures (22,23), where the maximum power densities at 600 ºC are 386 and 270 mW/cm 2 , respectively. Therefore, the electrical performance of the single cell needs to be improved in the future.…”

Section: Electrical Performance Of Single Cell Based On Gdc Electrolycontrasting

confidence: 82%

“…The open circuit voltages (OCV) are 0.83, 0.81 and 0.74 V at 500, 600 and 700 ºC, respectively. The reported OCVs at 600 ºC are 0.90 V for a single cell with 19 µm GDC electrolyte (22) and 0.85 V for a single cell with 26 µm GDC electrolyte (23) . The OCV of single cell in this study is lower than that of the reported single cell.…”

Section: Microstructure Of Gdc Electrolyte Filmsmentioning

confidence: 98%

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Preparation and Characterization of Ce0.9Gd0.1O1.95 Electrolyte Films by Spray Coating Process

Ding

Lin

Sato

et al. 2010

JMMP

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Anode-supported solid oxide fuel cells (SOFCs) have attracted extensive attention due to low operating temperatures and high electrical performance. In the anodesupported SOFCs, the key is to prepare dense electrolyte films on porous anode substrates. In this study, a simple and cost-effective technique, spray coating process, is introduced to prepare dense electrolyte films. In the spray coating process, the preparation of powder suspension is very important, which affects the quality of resulting electrolyte films. A well-dispersed Ce 0.9 Gd 0.1 O 1.95 (GDC) suspension were prepared in isopropyl alcohol by adding 2 mass% surfactant. Using the well-dispersed GDC suspension, dense and crack-free GDC electrolyte films with thickness of 2-10 µm were successfully prepared on porous NiO-GDC anode substrates by the spray coating process. In order to evaluate the GDC electrolyte film as electrolyte for SOFC, anode-supported SOFC was fabricated and its electrical performance was measured. Results show that the GDC electrolyte film prepared by the spray coating process can be used as electrolyte of SOFC. The GDC electrolyte film is well adhered to the anode substrate, and there is no crack and delamination observed after electrical performance test.

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Section: Electrical Performance Of Single Cell Based On Gdc Electrolycontrasting

confidence: 82%

Section: Microstructure Of Gdc Electrolyte Filmsmentioning

confidence: 98%

Preparation and Characterization of Ce0.9Gd0.1O1.95 Electrolyte Films by Spray Coating Process

Ding

Lin

Sato

et al. 2010

JMMP

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“…• C. [39][40][41][42] Although caution must be taken since the OCV depends on the electrode polarization (and therefore a fair comparison should be done with strictly identical electrodes), GDC and SDC achieve similar voltages when the electrolyte thickness is almost the same. As the electrolyte becomes thinner, a decrease of the OCV occurs due to the growth of the leakage current density.…”

Section: Polarization and Eis Experiments-experiments At 700mentioning

confidence: 99%

A Distributed Charge Transfer Model for IT-SOFCs Based on Ceria Electrolytes

Rahmanipour

Pappacena

Boaro

et al. 2017

J. Electrochem. Soc.

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A distributed charge transfer model for IT-SOFCs with MIEC electrolyte and composite electrodes is developed. A physically-based description of the electronic leakage current in the electrolyte is included, together with mass and charge conservation equations. The model is applied to simulate experimental polarization curves and impedance spectra collected on IT-SOFCs consisting of SDC electrolytes, Cu-Pd-CZ80 infiltrated anodes and LSCF/GDC composite cathodes. Hydrogen electro-oxidation experiments are examined (H 2 /N 2 humidified mixtures, 700 • C, 30-100% H 2 molar fraction). A significant increase of the ohmic resistance measured in the impedance spectra is revealed at decreasing the H 2 partial pressure or increasing the voltage (from 0.71 cm 2 at 100% H 2 to 0.81 cm 2 at 30% H 2 ). Good agreement between the calculated and experimental polarization and EIS curves is achieved by fitting the exchange current density and the capacitance of each electrode. Model and theoretical analyses allow to rationalize the observed shift of the ohmic resistance, highlighting the key-role played by the electronic leakage current. Overall, the model is able to capture significant kinetic features of IT-SOFCs, and allows to gain insight into relevant parameters for the optimal design of the cell (electrochemically active thickness, current and potential distribution, mass diffusion gradients). Samaria doped Ceria (SDC) and Gadolinia doped Ceria (GDC) are reference electrolyte materials for intermediate temperature solid oxide fuel cell (IT-SOFC) applications, thanks to their high ionic conductivity between 500• C and 700• C. 1-5 Associated to a high ionic conductivity, however, these materials show mixed ionic and electronic conductive (MIEC) properties, and their electronic conductivity increases when exposed to reducing atmospheres. The MIEC character of the electrolyte, in turn, results in the onset of electronic leakage currents (or short circuit currents) and low open-circuit voltage values. The leakage current has a chemical origin and is due to the partial reduction of Ce 4+ ions to Ce 3+ ions, prompted by the different chemical potential at the electrodes: this current is active also in the absence of an electric field applied on the cell, since it stems from the spontaneous transfer of ions across the lattice structure. As a consequence, the effects of the leakage current are not confined to the electrolyte, but extend to the electrodes, and entail a complex relationship with the current drawn from the cell. 6 Deeper insight can therefore be achieved by mathematical modeling.In the literature, comprehensive models can be found, which take into account the MIEC properties of Ce-based electrolytes. Starting from continuum rigorous descriptions, a series of models has been derived for the prediction of impedance spectra collected on MIEC electrolytes, the most important examples being those by Jamnik and Maier, 7 by the group of Haile 8,9 and by Atkinson et al. 10 These models propose closed-form, equivalent circuit-l...

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“…Therefore, anode supported cell (ASC) generally exhibits higher power density compared with that of ESC due to its low IR loss by using thin electrolyte film, and there are many studies reported on ASC using YSZ or Gd-doped CeO 2 (GDC) electrolyte. 4) 7) In recent years, micro-tubular SOFC has also been attracting interest due to their higher mechanical and thermal stability, simple gas sealing, higher power density and shorter times to start-up and shut-down comparing with that of the conventional ESC designs.…”

Section: Introductionmentioning

confidence: 99%

Microtubular SOFC using doped LaGaO<sub>3</sub> electrolyte film prepared with dip coating method

Hosoi

Hong

Sakai

et al. 2015

J. Ceram. Soc. Japan

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Preparation of Microtubular cell using doped lanthanum gallate (LSGM) electrolyte with a dip coating and co-sintering process was studied. In order to suppress Ni diffusion from Ni-based anode substrate to LSGM electrolyte layer, Ti added La-doped ceria (Ti-LDC) was inserted as buffer layer. The amount of Ni diffused in LSGM electrolyte was investigated by EDX analysis as a function of sintering temperatures. It was found that sintering at 1350°C is suitable from the sintering density and the Ni diffusion. The cell sintered at 1350°C exhibited the higher power density than that of the conventional LSGM micro-tubular cell, even though a small amount of Ni diffusion was still observed at the Ti-LDC buffer layer/LSGM electrolyte interface. The microtubular cell with around 50¯m thickness showed the open circuit potential higher than 1.0 V and the maximum power density of 0.69, 0.31 and 0.12 W/cm 2 at 700, 600 and 500°C, respectively, were achieved.

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Fabrication and performance of gadolinia-doped ceria-based intermediate-temperature solid oxide fuel cells

Cited by 87 publications

References 25 publications

Preparation and Characterization of Ce0.9Gd0.1O1.95 Electrolyte Films by Spray Coating Process

Preparation and Characterization of Ce0.9Gd0.1O1.95 Electrolyte Films by Spray Coating Process

A Distributed Charge Transfer Model for IT-SOFCs Based on Ceria Electrolytes

Microtubular SOFC using doped LaGaO<sub>3</sub> electrolyte film prepared with dip coating method

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