Comparison of solid oxide fuel cell (SOFC) electrolyte materials for operation at 500 °C

Zhang, J.; Lenser, Christian; Menzler, Norbert H.; Guillon, Olivier

doi:10.1016/j.ssi.2019.115138

Cited by 116 publications

(54 citation statements)

References 68 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The fitted values for the activation energy of each partial conductivity are shown in Table 1, along with the grain and grain boundary capacitances at 200 °C. All values are within the expected range for GDC ceramics 93,94 .…”

Section: Accepted Articlesupporting

confidence: 73%

“…This model yields satisfactory results for the conventionally sintered ceramic and the flash sintered ceramic, when extended by R-CPE elements to describe the electrode response. A grain size analysis for a sample processed under identical conditions as the reference sample yielded an average grain size of 0.73 + 0.3 µm, and the relative density was determined as 97.9 + 0.2 %93 . The values for total and grain conductivity of both samples are identical within the margin of error of the analysis, while the grain boundary…”

mentioning

confidence: 99%

See 1 more Smart Citation

Development of a processing map for safe flash sintering of gadolinium‐doped ceria

et al. 2021

Self Cite

View full text Add to dashboard Cite

Flash sintering was discovered in 2010, where a dog-bone shaped zirconia sample was sintered at a furnace temperature of 850 o C in < 5s by applying electric fields of ~100 V cm -1 directly to the specimen. Since its discovery, it has been successfully applied to several if not all oxides and even ceramics of complex compositions. Among several processing parameters in flash sintering, the Accepted ArticleThis article is protected by copyright. All rights reserved electrical parameters i.e. electric field and electric current were found to influence the onset temperature for flash and the degree of densification respectively. In this work, we have systematically investigated the influence of the electrical parameters on the onset temperature, densification behavior and microstructure of the flash sintered samples. In particular, we focus on the development of a processing map that delineates the safe and fail regions for flash sintering over a wide range of applied current densities and electric fields. As a proof of concept, Gadolinium-doped Ceria (GDC) is shown as an example for developing of such a processing map for flash sintering, which can also be transferred to different materials systems. Localization of current coupled with hot spot formation and crack formation are identified as two distinct failure mode in flash sintering. The grain size distribution across the current localized and nominal regions of the specimen was analyzed. The specimens show exaggerated grain growth near the positive electrode (anode). The region adjacent to the negative electrodes (cathode) showed retarded densification with large concentration of isolated pores. The electrical conductivity of the flash sintered and conventional sintered samples shows identical electrical conductivity. This quantitative analysis indicates that similar sintering quality of the GDC can be achieved by flash sintering at temperature as low as 680° C.

show abstract

Section: Accepted Articlesupporting

confidence: 73%

mentioning

confidence: 99%

Development of a processing map for safe flash sintering of gadolinium‐doped ceria

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, the current commercialization process of SOFC is still restricted by its excessively high operating temperature, as the ionic transport in electrolytes and the catalytic activity of cathode that are linked to the power output and lifetime of fuel cells are thermally driven processes. For instance, the most frequently used electrolyte by far, Y 2 O 3 -stabilized ZrO 2 (YSZ) strictly requires high temperature over 700 °C to reach a sufficient ionic conductivity to run the fuel cell [ 2 , 3 , 4 ]. For addressing this challenge, extensive efforts have been made to reduce the operating temperature of SOFCs to a lower range of 400–600 °C [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Remarkable Ionic Conductivity in a LZO-SDC Composite for Low-Temperature Solid Oxide Fuel Cells

Tian

et al. 2021

Nanomaterials

View full text Add to dashboard Cite

Recently, appreciable ionic conduction has been frequently observed in multifunctional semiconductors, pointing out an unconventional way to develop electrolytes for solid oxide fuel cells (SOFCs). Among them, ZnO and Li-doped ZnO (LZO) have shown great potential. In this study, to further improve the electrolyte capability of LZO, a typical ionic conductor Sm0.2Ce0.8O1.9 (SDC) is introduced to form semiconductor-ionic composites with LZO. The designed LZO-SDC composites with various mass ratios are successfully demonstrated in SOFCs at low operating temperatures, exhibiting a peak power density of 713 mW cm−2 and high open circuit voltages (OCVs) of 1.04 V at 550 °C by the best-performing sample 5LZO-5SDC, which is superior to that of simplex LZO electrolyte SOFC. Our electrochemical and electrical analysis reveals that the composite samples have attained enhanced ionic conduction as compared to pure LZO and SDC, reaching a remarkable ionic conductivity of 0.16 S cm−1 at 550 °C, and shows hybrid H+/O2− conducting capability with predominant H+ conduction. Further investigation in terms of interface inspection manifests that oxygen vacancies are enriched at the hetero-interface between LZO and SDC, which gives rise to the high ionic conductivity of 5LZO-5SDC. Our study thus suggests the tremendous potentials of semiconductor ionic materials and indicates an effective way to develop fast ionic transport in electrolytes for low-temperature SOFCs.

show abstract

“…[ 16,17 ] When operating the cell at 600–700 °C, ScSZ is of interest as an alternative to YSZ due to its superior ionic conductivity. [ 62 ] However, YSZ is still used in many applications because of the higher price of Sc and issues concerning fabrication and phase stability of ScSZ. [ 16,34 ] The largest drawback of zirconia‐based electrolytes is their reactivity with Sr (and to a lesser extent La) which are elements present in many high‐performance air electrodes.…”

Section: Soc Processing Testing Setups and Materialsmentioning

confidence: 99%

Performance Benchmark of Planar Solid Oxide Cells Based on Material Development and Designs

et al. 2021

Self Cite

View full text Add to dashboard Cite

Solid oxide cell (SOC) technology currently attracts great attention due to its unique potential for substantially contributing to a carbon‐neutral power supply. The variety in possible designs and applications—covering oxygen ion and proton conductors and the ability to convert surplus electricity to easily storable synthetic fuels, as well as to produce electricity from these fuels according to demand and availability—provides the excellent position of SOCs with regard to decentralized power generation and distribution. Herein, a reference work on cell performance is provided by highlighting specific advantages of the different cell types, designs, and materials with regard to certain operating conditions, including challenges concerning operational modes, processing, and degradation. In conjunction with a critical examination in terms of relevance and technical feasibility, the data provided enable an assessment of the general potential of the cell types for technology development and connect scientific research to industrial considerations.

show abstract

Comparison of solid oxide fuel cell (SOFC) electrolyte materials for operation at 500 °C

Cited by 116 publications

References 68 publications

Development of a processing map for safe flash sintering of gadolinium‐doped ceria

Development of a processing map for safe flash sintering of gadolinium‐doped ceria

Remarkable Ionic Conductivity in a LZO-SDC Composite for Low-Temperature Solid Oxide Fuel Cells

Performance Benchmark of Planar Solid Oxide Cells Based on Material Development and Designs

Contact Info

Product

Resources

About

Comparison of solid oxide fuel cell (SOFC) electrolyte materials for operation at 500 °C

Cited by 116 publications

References 68 publications

Development of a processing map for safe flash sintering of gadolinium‐doped ceria

Development of a processing map for safe flash sintering of gadolinium‐doped ceria

Remarkable Ionic Conductivity in a LZO-SDC Composite for Low-Temperature Solid Oxide Fuel Cells

Performance Benchmark of Planar Solid Oxide Cells Based on Material Development and Designs

Contact Info

Product

Resources

About

Comparison of solid oxide fuel cell (SOFC) electrolyte materials for operation at 500 °C