Electrophoretic deposition for fabrication of YSZ electrolyte film on non-conducting porous NiO–YSZ composite substrate for intermediate temperature SOFC

Hosomi, Takushi; Matsuda, Motohide; Miyake, Michihiro

doi:10.1016/j.jeurceramsoc.2006.04.175

Cited by 73 publications

(59 citation statements)

References 19 publications

(22 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the preparation of electrolyte films in anode-supported SOFCs, a sintering step is needed to consolidate and densify the particles deposited by EPD, which are well packed using the proper deposition parameters with high green density. In the case of YSZ, EPD film occurs on pre-sintered substrates [21,22]. A balance between the substrate and film shrinkage during the co-firing has to be achieved to avoid film cracks.…”

Section: Introductionmentioning

confidence: 99%

Electrophoretic Deposition of Dense Sr‐ and Mg‐Doped LaGaO₃ Electrolyte Films on Porous La‐Doped Ceria for Intermediate Temperature Solid Oxide Fuel Cells

2008

View full text Add to dashboard Cite

The application of the electrophoretic deposition (EPD) technique to the preparation of dense La0.8Sr0.2Ga0.8Mg0.2O2.8 (LSGM) electrolyte films for intermediate temperature solid oxide fuel cells (IT‐SOFCs) was investigated. Suspensions of LSGM were prepared in acetone + I2 + H2O dispersion media. The effects of water and iodine content, of the applied voltage, and of powder loading on the EPD rate were systematically studied using metallic substrates (Pt and stainless steel). This allowed to identify the suitable set of EPD process parameters that were used to deposit LSGM films on tape‐cast composite electrodes, composed of lanthanum‐doped ceria (La0.4Ce0.6O2 –x, LDC), polyvinylidene difluoride (PVDF) and carbon powders. After EPD, dense and crack‐free 15 μm thick LSGM films were obtained on porous LDC by co‐firing in air at 1,490 °C. Line profile analyses performed by energy dispersive X‐ray spectroscopy (EDS) did not reveal any interdiffusion of ions across the LSGM/LDC interface. The chemical and structural compatibility of LSGM with LDC was also checked by heat treating a mixture of the two powders (1:1 weight ratio) using the same thermal cycle as that of the LDC/LSGM bi‐layer co‐firing at 1,490 °C. EPD has thus proven to be a viable way for manufacturing anode‐supported LSGM electrolyte films.

show abstract

Section: Introductionmentioning

confidence: 99%

Electrophoretic Deposition of Dense Sr‐ and Mg‐Doped LaGaO₃ Electrolyte Films on Porous La‐Doped Ceria for Intermediate Temperature Solid Oxide Fuel Cells

2008

View full text Add to dashboard Cite

show abstract

“…[7] Numerous attempts have been made to find alternative systems that can be operated at lower temperatures. [8,9] We report here unprecedented observations of power generation at temperatures as low as room temperature using dense bulk nanostructured yttria-stabilized zirconia (YSZ) and samaria-doped ceria (SDC) as electrolytes. This behavior is observed only when the material is nanostructured (grain size ∼ 15 nm).…”

mentioning

confidence: 99%

Unprecedented Room‐Temperature Electrical Power Generation Using Nanoscale Fluorite‐Structured Oxide Electrolytes

et al. 2008

View full text Add to dashboard Cite

The conversion of chemical energy to electrical energy through the use of fuel cells is an important step in the transition to a hydrogen-based economy. [1,2] Of the many types of fuel cells, solid oxide fuel cells (SOFCs), employing either oxygen ions or protons as charge carriers, provide an efficient, environmentally benign, and fuel-flexible power generation system that can be adapted for small power units (including mobile applications) and for large scale power plants. [3,4] However, SOFCs require high temperatures (800-1000°C), a condition that presents material degradation problems, [5,6] as well as other technological complications and economic obstacles. [7] Numerous attempts have been made to find alternative systems that can be operated at lower temperatures. [8,9] We report here unprecedented observations of power generation at temperatures as low as room temperature using dense bulk nanostructured yttria-stabilized zirconia (YSZ) and samaria-doped ceria (SDC) as electrolytes. This behavior is observed only when the material is nanostructured (grain size ∼ 15 nm). Open circuit electromotive force (emf) (up to 180 mV for YSZ and 400 mV for SDC) and closed circuit currents (∼ 6 nA for YSZ and 30 nA for SDC) were measured from water concentration cells, indicating proton conduction within the nanostructured oxides. These results show that with optimization, viable power generation using water concentration cells at room temperature is a possible goal. Low-temperature protonic conduction has been reported before for polymeric electrolytes and for structurally hydrated (i.e., hydrous) oxides. However, these materials have limitations that have largely restricted their further considerations for practical utilization. Polymeric electrolytes (e.g., Nafion) have limitations with respect to thermal stability, so that they are mostly limited to temperatures below 100°C. [10,11] In addition, polymeric systems require a catalyst whose optimal operation temperature is inconsistent with the thermal stability of the polymer. Another factor for these systems is the cost. In the case of hydrous oxides (e.g., SnO 2 · nH 2 O, ZrO 2 · nH 2 O, WO 3 · nH 2 O [11][12][13][14] ), the loss of structural water (at low temperatures, < 100°C) changes the protonic conductivity irreversibly, [12] with a concomitant degradation of mechanical properties. We were successful in making dense, bulk nanostructured YSZ (8 mol % yttria) and SDC (20 mol % samaria) with a grain size of ∼ 15 nm through the use of field-activated sintering of nanopowders.[15] We found ionic conductivity at low temperatures in structurally unhydrated YSZ only when the grain size of the material is in the nanoscale. [16] In the present work, we use these materials as electrolytes and demonstrate electrical power generation at room temperature using water concentration cells. We constructed concentration cells, using the nanostructured YSZ and SDC as electrolytes, as shown schematically in Figure 1. We measured the emf of both the YSZ and the SDC cells at room t...

show abstract

“…A mismatch in the shrinkage would produce stress which can lead to cracking of the electrolyte film during the cosintering process [10,22,28]. As already mentioned in the introduction, the linear shrinkage of the anode-support also affects the densification of the electrolyte film [17,19,22,29]. Some example values for shrinkage found in the literature are: Substrate shrinkage of above 15% has been found to produce fully densified GDC electrolyte films under single dipping conditions [17].…”

Section: Sintering Characteristics Of 8ysz Electrolyte and Nio-ysz Anodementioning

confidence: 97%

“…A common practice to avoid cracking during co-sintering is by using substrates that shrink together with the coating [10,22,26,28]. Substrate shrinkage during cosintering is also reported to aid the densification of the coating [17,19,22,29].…”

Section: Introductionmentioning

confidence: 99%

Dip-coating of 8YSZ nanopowder for SOFC applications

Tikkanen

Suciu

Wærnhus

et al. 2011

Ceramics International

View full text Add to dashboard Cite

Electrophoretic deposition for fabrication of YSZ electrolyte film on non-conducting porous NiO–YSZ composite substrate for intermediate temperature SOFC

Cited by 73 publications

References 19 publications

Electrophoretic Deposition of Dense Sr‐ and Mg‐Doped LaGaO₃ Electrolyte Films on Porous La‐Doped Ceria for Intermediate Temperature Solid Oxide Fuel Cells

Electrophoretic Deposition of Dense Sr‐ and Mg‐Doped LaGaO₃ Electrolyte Films on Porous La‐Doped Ceria for Intermediate Temperature Solid Oxide Fuel Cells

Unprecedented Room‐Temperature Electrical Power Generation Using Nanoscale Fluorite‐Structured Oxide Electrolytes

Dip-coating of 8YSZ nanopowder for SOFC applications

Contact Info

Product

Resources

About

Electrophoretic deposition for fabrication of YSZ electrolyte film on non-conducting porous NiO–YSZ composite substrate for intermediate temperature SOFC

Cited by 73 publications

References 19 publications

Electrophoretic Deposition of Dense Sr‐ and Mg‐Doped LaGaO3 Electrolyte Films on Porous La‐Doped Ceria for Intermediate Temperature Solid Oxide Fuel Cells

Electrophoretic Deposition of Dense Sr‐ and Mg‐Doped LaGaO3 Electrolyte Films on Porous La‐Doped Ceria for Intermediate Temperature Solid Oxide Fuel Cells

Unprecedented Room‐Temperature Electrical Power Generation Using Nanoscale Fluorite‐Structured Oxide Electrolytes

Dip-coating of 8YSZ nanopowder for SOFC applications

Contact Info

Product

Resources

About

Electrophoretic Deposition of Dense Sr‐ and Mg‐Doped LaGaO₃ Electrolyte Films on Porous La‐Doped Ceria for Intermediate Temperature Solid Oxide Fuel Cells

Electrophoretic Deposition of Dense Sr‐ and Mg‐Doped LaGaO₃ Electrolyte Films on Porous La‐Doped Ceria for Intermediate Temperature Solid Oxide Fuel Cells