Development and microstructure optimization of atmospheric plasma-sprayed NiO/YSZ anode coatings for SOFCs

Kim, Sooki; Kwon, Ohchul; Kumar, S.; Xiong, Yao; Lee, Changhee

doi:10.1016/j.surfcoat.2007.11.041

Cited by 25 publications

(6 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, careful control of the microstructure is essential for the optimization of the electrochemical performance of an anode. One of the most frequently used anode materials for SOFCs is a double phase nickel and YSZ (Ni/YSZ) “cermet” material, where Ni is both regarded as a catalyst for the internal reforming of methane to CO/H 2 and the subsequent electro-oxidation of hydrogen and CO to water and CO 2 , whereas YSZ forms a porous ceramic network required to create an extended reaction zone as well as to adapt the thermomechanical properties of the anode to the ones of the other cell components. − In addition to hydrogen, several hydrocarbons, transforming to H 2 and CO by external or internal reforming processes, can also be used as fuels . Because of its abundance and high hydrogen-to-carbon ratio, methane as hydrogen/carbon source is regarded as the main energy source for fuel cell technology.…”

Section: Introductionmentioning

confidence: 99%

Methane Decomposition and Carbon Growth on Y₂O₃, Yttria-Stabilized Zirconia, and ZrO₂

et al. 2014

View full text Add to dashboard Cite

Carbon deposition following thermal methane decomposition under dry and steam reforming conditions has been studied on yttria-stabilized zirconia (YSZ), Y2O3, and ZrO2 by a range of different chemical, structural, and spectroscopic characterization techniques, including aberration-corrected electron microscopy, Raman spectroscopy, electric impedance spectroscopy, and volumetric adsorption techniques. Concordantly, all experimental techniques reveal the formation of a conducting layer of disordered nanocrystalline graphite covering the individual grains of the respective pure oxides after treatment in dry methane at temperatures T ≥ 1000 K. In addition, treatment under moist methane conditions causes additional formation of carbon-nanotube-like architectures by partial detachment of the graphite layers. All experiments show that during carbon growth, no substantial reduction of any of the oxides takes place. Our results, therefore, indicate that these pure oxides can act as efficient nonmetallic substrates for methane-induced growth of different carbon species with potentially important implications regarding their use in solid oxide fuel cells. Moreover, by comparing the three oxides, we could elucidate differences in the methane reactivities of the respective SOFC-relevant purely oxidic surfaces under typical SOFC operation conditions without the presence of metallic constituents.

show abstract

Section: Introductionmentioning

confidence: 99%

Methane Decomposition and Carbon Growth on Y₂O₃, Yttria-Stabilized Zirconia, and ZrO₂

et al. 2014

View full text Add to dashboard Cite

show abstract

“…The reliability and cost of these materials along with the conventional fabrication techniques allow them maintain their importance for the implementation of SOFC applications (5)(6). microstructure plays a critical role in oxidation of fuel and generation of electrons in the anode (10)(11)(12), it influences the reduction of the oxygen and delivery of the electrons in the cathode (13)(14). Both anode and cathode layers have to satisfy the requirements of high electrical conductivity, uniform phase distribution, high surface area and high permeability for the reactant and product gases to provide improved electrochemical performance (9,(15)(16)(17).…”

Section: Introductionmentioning

confidence: 99%

Effect of Microstructural Evolution on the Electrochemical Properties of High Performance SOFCs

2012

View full text Add to dashboard Cite

Microstructures of the component layers play a critical role in the performance of anode supported solid oxide fuel cells (SOFCs). Conventional SOFC configuration composed of laminated and cosintered NiO-YSZ (yttria stabilized zirconia) anode and YSZ electrolyte and screen printed YSZ-LSM (lanthanum-strontium manganite) was used to investigate the performance of the tailored microstructures. Identification of the polarization mechanisms in half and complete cells allowed improving the microstructural development of the electrodes. Polystyrene demonstrated striking features among the pore formers evaluated to optimize the microstructure of Ni-YSZ anodes. The effects of the composition and sintering temperature on the polarization of YSZ-LSM cathodes were investigated to optimize the cathode performance. The contribution of the electrolyte to the ohmic polarization was lowered by decreasing its thickness. Power densities over 1.75 W/cm 2 were measured at 800 o C in flowing 10% hydrogen -90% argon gas mixture on the anode side and air on the cathode side.

show abstract

“…Solid oxide fuel cell (SOFC) is a highly efficient energy‐conversion device that converts chemical energy into electric energy directly through electrochemical reaction 1, 2. In general, the key components of SOFC are anode, cathode, electrolyte, interconnect, and sealing glass 3, in which the anode plays an important role in generation of electron from oxide fuel 4. Ni‐YSZ porous cermets are widely used as anode support because of their excellent electrochemical performance 5.…”

Section: Introductionmentioning

confidence: 99%

In suit Investigation of Anode Support on Cell Performance Reduced under Various Temperatures for Planar Solid Oxide Fuel Cells

2015

View full text Add to dashboard Cite

The performance of anode support of Ni-YSZ reduced from room temperature (T R ) to working temperature (T w ) and at T w in anode-supported planar solid oxide fuel cell was investigated quantitatively in situ. A 2 μm thick Pt voltage probe was embedded at the interface between the anode support and the function anode in the cell. Results showed that the power densities of the stack that was reduced from T R to T w (stack 1) and stack reduced at T w (stack 2) were 0.343 W cm -2 and 0.583 W cm -2 with the corresponding fuel utilization of 36.28% and 63.87%, respectively, under the operating voltage of 0.8 V. The degradation rate of stack 1 was 7.76 times more than that of stack 2 when the stack was discharged under a constant current of 0.476 Acm -2 for 100 h. Ni particles agglomerated in the anode support of the cell inside stack 1, whereas Ni particles in the anode support of the cell inside stack 2 were evenly distributed. The performance of stack 1 was poor mainly because of the increasing ohmic and polarization resistances caused by Ni agglomeration and decreasing porosity of the anode support.

show abstract

Development and microstructure optimization of atmospheric plasma-sprayed NiO/YSZ anode coatings for SOFCs

Cited by 25 publications

References 14 publications

Methane Decomposition and Carbon Growth on Y₂O₃, Yttria-Stabilized Zirconia, and ZrO₂

Methane Decomposition and Carbon Growth on Y₂O₃, Yttria-Stabilized Zirconia, and ZrO₂

Effect of Microstructural Evolution on the Electrochemical Properties of High Performance SOFCs

In suit Investigation of Anode Support on Cell Performance Reduced under Various Temperatures for Planar Solid Oxide Fuel Cells

Contact Info

Product

Resources

About

Development and microstructure optimization of atmospheric plasma-sprayed NiO/YSZ anode coatings for SOFCs

Cited by 25 publications

References 14 publications

Methane Decomposition and Carbon Growth on Y2O3, Yttria-Stabilized Zirconia, and ZrO2

Methane Decomposition and Carbon Growth on Y2O3, Yttria-Stabilized Zirconia, and ZrO2

Effect of Microstructural Evolution on the Electrochemical Properties of High Performance SOFCs

In suit Investigation of Anode Support on Cell Performance Reduced under Various Temperatures for Planar Solid Oxide Fuel Cells

Contact Info

Product

Resources

About

Methane Decomposition and Carbon Growth on Y₂O₃, Yttria-Stabilized Zirconia, and ZrO₂

Methane Decomposition and Carbon Growth on Y₂O₃, Yttria-Stabilized Zirconia, and ZrO₂