Relevant bibliographies by topics / Ni/YSZ pattern anodes

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Ni/YSZ pattern anodes'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Ni/YSZ pattern anodes.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Ni/YSZ pattern anodes"

1

Goodwin, David G., Huayang Zhu, Andrew M. Colclasure, and Robert J. Kee. "Modeling Electrochemical Oxidation of Hydrogen on Ni–YSZ Pattern Anodes." Journal of The Electrochemical Society 156, no. 9 (2009): B1004. http://dx.doi.org/10.1149/1.3148331.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Yao, W., and E. Croiset. "Investigation of H2, CO and Syngas Electrochemical Performance Using Ni/YSZ Pattern Anodes." ECS Transactions 53, no. 30 (October 6, 2013): 163–72. http://dx.doi.org/10.1149/05330.0163ecst.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Yurkiv, Vitaliy, Annika Utz, André Weber, Ellen Ivers-Tiffée, Hans-Robert Volpp, and Wolfgang G. Bessler. "Elementary Kinetic Numerical Simulation of Electrochemical CO Oxidation on Ni/YSZ Pattern Anodes." ECS Transactions 35, no. 1 (December 16, 2019): 1743–51. http://dx.doi.org/10.1149/1.3570162.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Yao, Weifang, and Eric Croiset. "Stability and electrochemical performance of Ni/YSZ pattern anodes in H2/H2O atmosphere." Canadian Journal of Chemical Engineering 93, no. 12 (October 7, 2015): 2157–67. http://dx.doi.org/10.1002/cjce.22330.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Yurkiv, Vitaliy, Annika Utz, André Weber, Ellen Ivers-Tiffée, Hans-Robert Volpp, and Wolfgang G. Bessler. "Elementary kinetic modeling and experimental validation of electrochemical CO oxidation on Ni/YSZ pattern anodes." Electrochimica Acta 59 (January 2012): 573–80. http://dx.doi.org/10.1016/j.electacta.2011.11.020.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Yao, W., and E. Croiset. "Ni/YSZ pattern anodes fabrication and their microstructure and electrochemical behavior changes in H2–H2O environments." Journal of Power Sources 226 (March 2013): 162–72. http://dx.doi.org/10.1016/j.jpowsour.2012.10.053.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Bai, Shuang, and Jian Liu. "Femtosecond Laser Additive Manufacturing of Multi-Material Layered Structures." Applied Sciences 10, no. 3 (February 3, 2020): 979. http://dx.doi.org/10.3390/app10030979.

Full text
Abstract:
Laser additive manufacturing (LAM) of a multi-material multi-layer structure was investigated using femtosecond fiber lasers. A thin layer of yttria-stabilized zirconia (YSZ) and a Ni–YSZ layer were additively manufactured to form the electrolyte and anode support of a solid oxide fuel cell (SOFC). A lanthanum strontium manganite (LSM) layer was then added to form a basic three layer cell. This single step process eliminates the need for binders and post treatment. Parameters including laser power, scan speed, scan pattern, and hatching space were systematically evaluated to obtain optimal density and porosity. This is the first report to build a complete and functional fuel cell by using the LAM approach.
APA, Harvard, Vancouver, ISO, and other styles
8

Singh, Saurabh, Raghvendra Pandey, Sabrina Presto, Maria Paola Carpanese, Antonio Barbucci, Massimo Viviani, and Prabhakar Singh. "Suitability of Sm3+-Substituted SrTiO3 as Anode Materials for Solid Oxide Fuel Cells: A Correlation between Structural and Electrical Properties." Energies 12, no. 21 (October 24, 2019): 4042. http://dx.doi.org/10.3390/en12214042.

Full text
Abstract:
Perovskite anodes, nowadays, are used in any solid oxide fuel cell (SOFC) instead of conventional nickel/yttria-stabilized zirconia (Ni/YSZ) anodes due to their better redox and electrochemical stability. A few compositions of samarium-substituted strontium titanate perovskite, SmxSr1−xTiO3−δ (x = 0.00, 0.05, 0.10, 0.15, and 0.20), were synthesized via the citrate-nitrate auto-combustion route. The XRD patterns of these compositions confirm that the solid solubility limit of Sm in SrTiO3 is x < 0.15. The X-ray Rietveld refinement for all samples indicated the perovskite cubic structure with a P m 3 ¯ m space group at room temperature. The EDX mapping of the field emission scanning electron microscope (FESEM) micrographs of all compositions depicted a lower oxygen content in the specimens respect to the nominal value. This lower oxygen content in the samples were also confirmed via XPS study. The grain sizes of SmxSr1−xTiO3 samples were found to increase up to x = 0.10 and it decreases for the composition with x > 0.10. The AC conductivity spectra were fitted by Jonscher’s power law in the temperature range of 500–700 °C and scaled with the help of the Ghosh and Summerfield scaling model taking νH and σdc T as the scaling parameters. The scaling behaviour of the samples showed that the conduction mechanism depends on temperature at higher frequencies. Further, a study of the conduction mechanism unveiled that small polaron hopping occurred with the formation of electrons. The electrical conductivity, in the H2 atmosphere, of the Sm0.10Sr0.90TiO3 sample was found to be 2.7 × 10−1 S∙cm−1 at 650 °C, which is the highest among the other compositions. Hence, the composition Sm0.10Sr0.90TiO3 can be considered as a promising material for the application as the anode in SOFCs.
APA, Harvard, Vancouver, ISO, and other styles
9

Zhang, Yun, Bin Liu, Baofeng Tu, Yonglai Dong, and Mojie Cheng. "Redox Properties of Ni-YSZ Anodes." ECS Transactions 25, no. 33 (December 17, 2019): 97–106. http://dx.doi.org/10.1149/1.3334796.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Kong, Jiangrong, Kening Sun, Derui Zhou, Naiqing Zhang, Ju Mu, and Jinshuo Qiao. "Ni–YSZ gradient anodes for anode-supported SOFCs." Journal of Power Sources 166, no. 2 (April 2007): 337–42. http://dx.doi.org/10.1016/j.jpowsour.2006.12.042.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Ni/YSZ pattern anodes"

1

Yao, Weifang. "Hydrogen and Carbon Monoixde Electrochemical Oxidation Reaction Kinetics on Solid Oxide Fuel Cell Anodes." Thesis, 2013. http://hdl.handle.net/10012/7772.

Full text
Abstract:
Solid oxide fuel cells (SOFCs) are promising power generation devices due to its high efficiency and low pollutant emissions. SOFCs operate with a wide range of fuels from hydrogen (H2) to hydrocarbons, and are mainly intended for stationary power generation. Compared to combustion systems, SOFCs have significantly lower environmental impacts. However, the full scale commercialization of SOFCs is impeded by high cost and problems associated with long-term performance and durability. The cell performance can be affected by various internal losses, involving cathode, anode and electrolyte. Anodic losses make a significant contribution to the overall losses, practically in anode-supported cells. Therefore, it is desirable to reduce the anodic losses in order to enhance the overall cell performance. Knowledge of the actual elementary reaction steps and kinetics of electrochemical reactions taking place on the anode is critical for further improvement of the anode performance. Since H2 and carbon monoxide (CO) are the primary reforming products when hydrocarbons are used as SOFC fuels, investigation of electrochemical reactions involving H2 and CO should provide a better understanding of SOFC electrochemical behavior with hydrocarbon feeds. However, still exist uncertainties concerning both H2 and CO electrochemical reactions. The overall objective of this research is to investigate the mechanistic details of H2 and CO electrochemical reactions on SOFC anodes. To achieve this objective, Ni/YSZ pattern anodes were used in the experimental study and as model anodes for the simulation work due to their simplified 2-D structure. The Ni/YSZ pattern anodes were fabricated using a bi-layer resist lift-off method. Imaging resist nLOF2035 and sacrificial resist PGMI SF11 were found to be effective in the bi-layer photolithographic process. Suitable undercut size was found critical for successful pattern fabrication. A simple method, involving taking microscopic photographs of photoresist pattern was developed, to check if the undercut size is large enough for the lift-off; semi-circle wrinkles observable in photographs indicate whether the undercut is big enough for successful pattern anode fabrication. The final product prepared by this method showed straight and clear Ni patterns. A systematic study was performed to determine the stable conditions for Ni/YSZ pattern anode performance. The microstructure and electrochemical behavior changes of the pattern anode were evaluated as a function of Ni thickness, temperature and H2O content in H2 environment. Ni/YSZ pattern anodes with 0.5 µm thick Ni were tested in dry H2 at 550°C without significantly changing the TPB line. Ni/YSZ pattern anodes with Ni thickness of 0.8 µm were tested at 550°C under dry and humidified H2 (3-70% H2O) conditions without TPB line change. For 0.8 µm thick patterns, the TPB length showed pronounced changes in the presence of H2 with 3-70% H2O at 700°C. Significant increase in TPB length due to hole formation was observed at 800°C with 3% and 10% H2O. Ni/YSZ pattern anodes with 1.0 µm thick Ni were stable in H2 with 3% H2O in the range 500-800°C, with only slight changes in the TPB line. Changes of TPB line and Ni microstructure were observed in the presence of 3-70% H2O above 700C. Stabilization of the pattern anode performance depends on temperature. To accelerate stabilization of the cell, pre-treatment of the cell in H2 with 3% H2O for ~22 hrs at 750°C or 800°C could be performed. In addition, comprehensive data sets for H2 and CO electrochemical oxidation reactions on Ni/YSZ pattern anodes were obtained under stable test conditions. For the H2/H2O system, the polarization resistance (Rp) increases as temperature, overpotential, H2 partial pressure, TPB length decreases. Rp is also dependent on H2O content. When the H2O content is between 3% and 30-40%, Rp decreased with increasing H2O content. However, Rp is less affected with further increases in H2O content. For the CO/CO2 system, polarization resistance depends on partial pressure of CO and CO2, temperature and overpotential. Moreover, the polarization resistance decreases when the partial pressure of CO2 and temperature increase. The partial pressure of CO has a positive effect on the polarization resistance. The polarization resistance decreases to a minimum when the overpotential is 0.1 V. For both H2 and CO electrochemical oxidations, charge transfer reactions contribute to the rate limiting steps. A 1-D dynamic SOFC half-cell model considering multiple elementary reaction kinetics was developed. The model describes elementary chemical reactions, electrochemical reactions and surface diffusion on Ni/YSZ pattern anodes. A new charge transfer reactions mechanism proposed by Shishkin and Ziegler (2010) based on Density Functional Theory (DFT) was investigated through kinetic modeling and pattern anode experimental validation. This new mechanism considers hydrogen oxidation at the interface of Ni and YSZ. It involves a hydrogen atom reacting with the oxygen ions bound to both Ni and YSZ to produce hydroxyl (charge transfer reaction 1), which then reacts with the other hydrogen atom to form water (charge transfer reaction 2). The predictive capability of this reaction mechanism to represent our experimental results was evaluated. The simulated Tafel plots were compared with our experimental data for a wide range of H2 and H2O partial pressures and at different temperatures. Good agreements between simulations and experimental results were obtained. Charge transfer reaction 1 was found to be rate-determining under cathodic polarization. Under anodic polarization, a change in rate-limiting process from charge transfer reaction 1 to charge transfer reaction 2 was found when increasing the H2O partial pressure. Surface diffusion was not found to affect the H2 electrochemical performance.
APA, Harvard, Vancouver, ISO, and other styles
2

Thomas, Vaughan Lamar. "Particle-Based Modeling of Ni-YSZ Anodes." Thesis, 2012. https://thesis.library.caltech.edu/6881/1/thomas_vaughan_2012_thesis.pdf.

Full text
Abstract:

In this work we examine the performance of particle-based models with respect to the Ni-YSZ composite anode system. The conductivity and triple-phase boundary (tpb) of particle-based systems is estimated. The systems considered have mono-dispersed particle size distributions, bi-modal particle size distributions with a YSZ:Ni particle size ratio of 1:0.781, and particle size distributions based on experimental measurements. All three types of systems show qualitative behavioral agreement in terms of conductivity, with clear transition from non-conducting behavior to high conducting behavior over a small transition regime which varied from a nickel phase fraction of .22-.28 for the mono- dispersed cases, 0.19-.0.25 for the bimodal cases, and 0.19-0.30 for the experimentally based cases. Mono-dispersed and simple-polydispersed particle size distribution show very low variation from case to case, with σ/μ ≤ 0.04. Cases based on empirical particle size distribution data demonstrated significantly higher variances which varied over a very large range, 0.3 ≤ σ/μ ≤ 1.1. With respect to the calculations of the TPB length, we find that the same pattern of variance in the measure of the triple-phase boundary length. The TPB length for the mono-dispersed and simple poly-dispersed systems was in the range of 3 × 1012 –4 × 1013 m/m3 . For empirical particle size distribution data the TPB length density was in the range of 8×109–2×1011 m/m3. The variance of the TPB length density follows the same pattern as the conductivity measurements with very low variance for the mono-dispersed and simple poly-dispersed systems and much larger variance for the empirically-based systems. We also examine the association between the TPB length and the availability of conducting pathways for the participating particles xv of individual TPBs. The probability of a TPB having a conducting pathway in the gas phase is essentially 100% in all cases. The probability of an individual tpb section having conducting pathways in either of the solid phases is directly related to percolation condition of that phase.

We also considered a particle-based composite electrode realization based on a three- dimensional reconstruction of an actual Ni-YSZ composite electrode. For this model we used particles which vary in nominal size from 85–465 nm, with size increments of 42.5 nm. We paid particular attention to the coordination numbers between particles and the distribution of particle size interconnections. We found that homogeneous inter-particle connections were far more common than would occur using a random distribution of particles. In particular we found that for a random collection of particles of similar composition the likelihood Ni-Ni particle connections was between 0.18–0.30. For the reconstruction we found the likelihood of Ni-Ni particle connections to be greater than 0.56 in all cases. Similarly, the distribution of connections between particles, with respect to particle size of the participating particles, deviated from what would be expected using a random distribution of particles. Particles in the range of 85–169 nm showed the highest coordination with particles of the same size. Particles in the range of 211–338 nm have the highest coordination with particles of radius 169 nm with very similar distributions. Particles with radius greater than 338 nm represented only 7.2 × 10−3 % of the particles within the reconstruction, and showed the highest coordination with particles of radius of 211 nm, but the distributions vary widely.

In the final chapter, we build a model which can account for mass transfer, hetero- geneous chemistry, surface chemistry, and electrochemistry within a porous electrode. The electric potential is calculated on a particle basis using a network model; gas phase concentrations and surface coverages are calculated with a one-dimensional porous me- dia model. Properties of the porous media are calculated via a TPMC method. TPB electrochemistry is calculated at individual triple phase boundaries within the particle xvi model, based on local gas phase concentrations, surface coverages and particle poten- tials, and then added to the porous media model. Using this tool we are able to calculate the spatial distribution of the Faradaic current within the electrode, and variation in gas phase concentrations within the porous media.

APA, Harvard, Vancouver, ISO, and other styles
3

Wei, Jing-Run, and 魏境潤. "Effects of sintering temperature on performance of Ni/YSZ anodes." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/05441493737899163066.

Full text
Abstract:
碩士
元智大學
機械工程學系
94
In this research , electrochemical activity and material property for the anode of SOFC which sintered at different temperature were studied . Ni/YSZ is obtained by reducing a NiO/YSZ for the multi-layered anode . The current-voltage characteristics for single cell with the multi-layered anode were measured . Surface area of anode sintered at different temperature were calculate by Brunauer-Emmett-Teller (BET) , and also obtained the morphology of electrode structure by scanning electron microscope (SEM) . As the results , reactant area and morphology can be effected obviously by increasing or decreasing the sintering temperature , and which also influence the conductivity of electrode structure . Conductivity of electricity and surface were two important factors for the electrochemical activities that could be understood according to the result of current-voltage characteristic .
APA, Harvard, Vancouver, ISO, and other styles
4

Kirton, Kerry. "An Investigation of the Use of Hybrid Suspension-solution Feedstock to Fabricate Direct-oxidation Nickel-Based Anodes (BaO-Ni-YSZ, CeO2-Ni-YSZ, Sn-Ni-YSZ) by Plasma Spraying." Thesis, 2012. http://hdl.handle.net/1807/33272.

Full text
Abstract:
The reduction of manufacturing costs and the facilitation of direct-oxidation of hydrocarbon fuels have been identified as means of promoting the commercialization of the solid oxide fuel cell, a technology that offers both environmental and fuel conservation benefits compared to conventional energy conversion technologies. This research was conducted with the aim of realizing the production of direct-oxidation anodes using atmospheric plasma spraying, which has been identified as a fabrication technique that has the potential to reduce the manufacturing costs of solid oxide fuel cells. This thesis details the rationale behind the selection of the anode compositions (BaO-Ni-YSZ, CeO2-Ni-YSZ, and Sn-Ni-YSZ) and the specifics of the specialized fabrication strategy (SPS-SPPS) that was devised with the aim of realizing microstructures similar to those where the secondary phases (BaO, CeO2, and Sn) coat the surfaces of the primary Ni and YSZ phases. Results of XRD, SEM and EDS analyses are presented.
APA, Harvard, Vancouver, ISO, and other styles
5

Yeh, Dong-Yu, and 葉東育. "The Study of Sputter-Deposited Cu-CeO2-YSZ and Ni-CeO2-YSZ Thin Film Anodes for SOFC." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/3nb9h9.

Full text
Abstract:
碩士
國立臺灣科技大學
材料科技研究所
95
In this study, we investigate two different material systems, Cu-CeO2-YSZ and Ni-CeO2-YSZ, for the anode of solid oxide fuel cell (SOFC). By using co-sputter deposition technique, we deposit CuO-CeO2-YSZ or NiO-CeO2-YSZ film, and then use appropriate annealing and reducing conditions to form porous Cu-CeO2-YSZ or Ni-CeO2-YSZ film. The porous structure is expected to increase the three phase boundary and to reduce the polarization loss of the cell. The first part of study focuses the Cu-CeO2-YSZ material system. We deposited CuO-CeO2-YSZ thin film and Cu-Ce-Zr-Y metal thin film, respectively, following 500℃ annealing and 300℃ reduction in H2. It is found that some Cu particles precipitated out from the surface of thin film, which contains more than 9.46vol%-Cu, after annealing. The Cu precipitation reduced the concentration of Cu in the film. Pores are induced on the region of separated particles only, but not in the inner of the film. There is no appropriate way to overcome this problem at this moment, so the focus was changed to Ni-CeO2-YSZ. The second part of study focuses on the Ni-CeO2-YSZ material system. NiO-CeO2-YSZ thin films were deposited by co-sputtering, and then heat-treated by two different methods, direct reduction in H2 atmosphere and 2-step annealing and reduction. After the post treatments, the NiO-CeO2-YSZ thin films were converted to Ni-CeO2-YSZ thin film. The Ni nanowire would appear on the surface of the thin film if it is reduced in H2 directly without prior annealing. There were some pores in the thin films prepared by direct reduction. On the other way, if it was annealed at 900℃ firstly and then reduced in H2, the structure will become porous without forming Ni nanowire. Therefore, porous Ni-CeO2-YSZ films were prepared using the 2-step annealing and reduction. The Ni-CeO2-YSZ was used as anode, 8YSZ disc as electrolyte, and La0.7Sr0.3MnO3 - 8YSZ (50 wt%: 50 wt% ) as cathode to form fuel cells. Performance of the cell was measured in single chamber system using the mix gases of CH4, dry air and water vapor. The maximum open circuit voltage is 0.4V and the maximum power density is 0.23 mW/cm2 at 550℃.
APA, Harvard, Vancouver, ISO, and other styles
6

Lu, Yanchen. "Improving intermediate temperature performance of NI-YSZ cermet anodes for solid oxide fuel cells by infiltration of nickel nanoparticles and mixed ionic electronic conductors." Thesis, 2019. https://hdl.handle.net/2144/37096.

Full text
Abstract:
Solid oxide fuel cells (SOFCs) are one of the most efficient and environment-friendly devices for electricity generation. One critical challenge of SOFC commercialization is high cell operating temperatures (800°C-1000°C), which lead to high material costs, high performance degradation rates, long start-up and shutdown times, and limited portable applications. Intermediate temperature (600°C-800°C) operation of SOFCs is limited by sluggish electrode reaction kinetics. The objective of this research is to improve intermediate temperature performance of commercially available Ni-YSZ cermet anode supported SOFCs by liquid infiltration of the anode. One effective method to improve kinetics of electrochemical reactions at the anode is to increase the density of reaction sites, which are known as the triple phase boundaries (TPBs). The porous Ni-YSZ cermet anodes were liquid infiltrated with Ni nanoparticles, leading to a four-fold increase in TPB density in the anode. The improved electrochemical performance of the infiltrated cells compared to the uninfiltrated cells highlights the effectiveness of anode infiltration in facilitating improved anode electrochemical reaction kinetics. However, the post-electrochemical testing characterization revealed that Ni nanoparticles were not stable due to Ni coarsening and were mostly isolated indicating that not all of the additional TPBs were fully utilized in electrochemical reactions due to the lack of an electronic pathway between the Ni nanoparticles. In order to improve microstructural stability of the infiltrated Ni nanoparticles, and to fully utilize the added TPBs, co-infiltration of Ni with a mixed ionic and electronic conductor (MIEC) was carried out. Two MIEC materials are chosen based on their chemical stability and conductivity in the anode operating environments; Gd0.1Ce0.9O2-δ (GDC), a predominantly an ionic conductor, and La0.6Sr0.3Ni0.15Cr0.85¬O3-δ (LSNC), a predominantly electronic conductor, and cells were successfully co-infiltrated to form Ni-GDC and Ni-LSNC nanostructures with the MIEC phases connecting the Ni nanoparticles. Stability tests demonstrated that both MIECs inhibited Ni nanoparticle coarsening. Electrochemical studies showed that Ni-GDC is the most effective for improved anode kinetics. A long-term (120 hours) electrochemical test indicated that infiltration of Ni-GDC into Ni-YSZ cermet anode effectively improves overall cell performance at intermediate temperatures and maintains the performance gain for a long period of time.
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Ni/YSZ pattern anodes"

1

Corbin, S. F., R. M. Clemmer, and Q. Yang. "Development and Characterization of SOFC NI-YSZ Anodes Using Highly Porous NI Foam." In Ceramic Engineering and Science Proceedings, 151–58. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470291245.ch17.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Singh, C. Anand, and Venkatesan V. Krishnan. "Synthesis and Characterization of Ni Impregnated Porous YSZ Anodes for SOFCs." In Advances in Solid Oxide Fuel Cells IV, 173–79. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2009. http://dx.doi.org/10.1002/9780470456309.ch16.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Thydén, Karl, Rasmus Barfod, and Yi Lin Liu. "Degradation of Conductivity and Microstructure under Thermal and Current Load in Ni-YSZ Cermets for SOFC Anodes." In Advances in Science and Technology, 1483–88. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908158-01-x.1483.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Ni/YSZ pattern anodes"

1

Cayan, Fatma N., Suryanarayana R. Pakalapati, Francisco Elizalde-Blancas, and Ismail Celik. "A Phenomenological Model for Degradation of Solid Oxide Fuel Cell Anodes Due to Impurities in Coal Syngas." In ASME 2009 7th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2009. http://dx.doi.org/10.1115/fuelcell2009-85177.

Full text
Abstract:
A new phenomenological one-dimensional model is formulated to simulate the typical degradation patterns observed in Solid Oxide Fuel Cell (SOFC) anodes due to coal syngas contaminants such as arsenic (As) and phosphorous (P). The model includes ordinary gas phase diffusion including Knudsen diffusion and surface diffusion within the anode and the adsorption reactions on the surface of the Ni-YSZ based anode. Model parameters such as reaction rate constants for the adsorption reactions are calibrated to match the degradation rates reported in the literature. Preliminary results from implementation of the model demonstrated that the deposition of the impurity on the Ni catalyst starts near the fuel channel/anode interface and slowly moves toward the active anode/electrolyte interface which is in good agreement with the experimental data. Parametric studies performed at different impurity concentrations, operating temperatures and current densities showed that the coverage rate increases with increasing temperature, impurity concentration and current density, as expected.
APA, Harvard, Vancouver, ISO, and other styles
2

Cayan, Fatma N., Suryanarayana R. Pakalapati, and Ismail Celik. "A Degradation Model for Degradation of Solid Oxide Fuel Cell Anodes due to Impurities in Coal Syngas." In ASME 2011 9th International Conference on Fuel Cell Science, Engineering and Technology collocated with ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/fuelcell2011-54613.

Full text
Abstract:
A new phenomenological one-dimensional model is formulated to simulate the typical degradation patterns observed in Solid Oxide Fuel Cell (SOFC) anodes due to coal syngas contaminants such as arsenic (As) and phosphorous (P). The model includes gas phase diffusion and surface diffusion within the anode and the adsorption reactions on the surface of the Ni-YSZ-based anode. Model parameters such as reaction rate constants for the adsorption reactions are obtained through indirect calibration to match the degradation rates reported in the literature for arsine (AsH3), phosphine (PH3) and hydrogen sulfide (H2S) under accelerated testing conditions. Results from the model demonstrate that the deposition of the impurity on the Ni catalyst starts near the fuel channel/anode interface and slowly moves toward the active anode/electrolyte interface as observed in the experiments. Parametric studies performed at different impurity concentrations and operating temperatures show that the coverage rate increases with increasing temperature and impurity concentration, as expected. The calibrated model was then used for prediction of the performance curves at different impurity concentrations and operating temperatures. Good agreement is obtained between the predicted results and the experimental data reported in the literature.
APA, Harvard, Vancouver, ISO, and other styles
3

Shi, Yixiang, Won Yong Lee, and Ahmed F. Ghoniem. "Elementary Reaction Models for CO Electrochemical Oxidation on an Ni/YSZ Patterned Anode." In ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2010. http://dx.doi.org/10.1115/fuelcell2010-33205.

Full text
Abstract:
Analysis of recent experimental impedance spectra and polarization curves of nickel/yttria-stabilized zirconia (Ni/YSZ) patterned anode of a solid oxide fuel cell (SOFC) are used to determine the limiting steps in CO electrochemical oxidation kinetics. A comprehensive 1D model is proposed for the prediction of the steady-state polarization curve of a patterned anode SOFC. The model incorporates gas species adsorption/desorption with surface diffusion and one of two possible charge transfer reaction steps: O charge transfer reaction [O2−(YSZ)+(Ni)+↔(YSZ)+O(Ni)+2e−], or CO charge transfer reaction [O2−(YSZ)+CO(Ni)↔(YSZ)+CO2(Ni)+2e−]. We show that the mechanism incorporating charge transfer between adsorbed CO and oxygen vacancy is able to better predict the experimental data. We estimate some of the model parameters, such as the exchange current density and charge transfer coefficient by fitting the simulation of the polarization curves to the experimental data.
APA, Harvard, Vancouver, ISO, and other styles
4

Patel, Siddharth, Paul F. Jawlik, and Gregory S. Jackson. "Effects of Ceria Addition on Ni/YSZ Anodes for SOFC’s Operating With Syngas and n-Butane." In ASME 2009 7th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2009. http://dx.doi.org/10.1115/fuelcell2009-85090.

Full text
Abstract:
This study explores the incorporation of ceria (CeO2) into Ni/YSZ cermet anodes for solid oxide fuel cell performance with both syngas and n-butane/steam feeds to suppress carbon deposits and expand operability of Ni-based anodes with carbonaceous fuel feeds. CeO2 was co-fired with Ni/YSZ cermets to form a porous anode support layer (1 mm thick), which was tested in SOFC button cells with dense YSZ electrolytes (10–20 μm thick) and porous LSM/YSZ cathodes (∼50 μm thick). The co-fired Ni/CeO2/YSZ anode-supported cells were tested from 700 to 800 °C on various fuels including syngas and n-butane with H2O added at a 1.5-to-1 and a 1-to-1 steam-to-carbon (S/C) ratio. Electrochemical characterization revealed that CeO2 addition provided stable performance with high power densities at 800 °C — up to 0.6 W/cm2 on syngas and 0.35 W/cm2 on direct butane feeds — without significant carbon deposition as observed for Ni/YSZ anodes without CeO2. Testing with syngas at different H2 and CO partial pressures indicated that high power densities can be maintained along an anode channel for up to 50% fuel conversion. The results indicate that CeO2 addition to Ni/YSZ may provide a viable means for stable SOFC operation on either pre-reformed or direct light-hydrocarbon fuel feeds.
APA, Harvard, Vancouver, ISO, and other styles
5

Sakamoto, Yusuke, Naoki Shikazono, and Nobuhide Kasagi. "Effects of Electrode Microstructure on Polarization Characteristics of SOFC Anodes." In ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/fuelcell2008-65079.

Full text
Abstract:
Anode microstructure parameters were quantified by SEM-EDX measurements and the dependence of polarization characteristics on the anode microstructure parameters is investigated experimentally. Nickel yttria-stabilized zirconia (Ni-YSZ) anode supported cells with a thin YSZ electrolyte, lanthanum-strontium-manganite (LSM)-YSZ composite cathode, and LSM cathode current collector layers were fabricated by dip coating method. Anode microstructure was successfully imaged and quantified by ultra low voltage SEM and by means of stereology. Cell voltage measurements and impedance spectroscopy were performed at 650 and 750°C with hydrogen diluted by nitrogen as a fuel. A quantitative relationship between measured polarization and microstructure parameters, e.g., three phase boundary length, contiguity, etc., was discussed. Finally, a cell with an anode functional layer (AFL) was fabricated to investigate the possibility of improving both activation and concentration polarization characteristics.
APA, Harvard, Vancouver, ISO, and other styles
6

Ionov, I. V., N. S. Sochugov, A. A. Soloviev, A. N. Kovalchuk, A. O. Tcybenko, and T. I. Sigfusson. "Thin Ni-YSZ films fabricated by magnetron co-sputtering used as anodes for solid oxide fuel cells." In 2012 7th International Forum on Strategic Technology (IFOST). IEEE, 2012. http://dx.doi.org/10.1109/ifost.2012.6357501.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Harris, William M., Jeffrey J. Lombardo, George J. Nelson, Wilson K. S. Chiu, Barry Lai, Steve Wang, Joan Vila-Comamala, Mingfei Liu, and Meilin Liu. "Examining Effects of Sulfur Poisoning on Ni/YSZ Solid Oxide Fuel Cell Anodes Using Synchrotron-Based X-Ray Imaging Techniques." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63972.

Full text
Abstract:
Fuel flexibility is widely considered one of the most significant advantages of solid oxide fuel cells (SOFC). However, the presence of small amounts of sulfur or other impurities in the gas stream can have a serious impact on cell performance [1–10]. Under certain conditions, hydrogen sulfide (H2S), even at the ppm level, can lead to the formation of bulk nickel-sulfides within the conventional Ni–yttria-stabilized zirconia (Ni-YSZ) anode of SOFC’s [9]. Understanding the distribution of these sulfides is critical to describing their effects on the electrochemical activity of the cell.
APA, Harvard, Vancouver, ISO, and other styles
8

Rajaram, Gukan, Zhigang Xu, Devdas M. Pai, and Jag Sankar. "Effect of Processing Parameters on the Conductivity of the Solid Oxide Anode for Fuel Cells." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79967.

Full text
Abstract:
Good electrical conductivity is highly desirable in Ni / YSZ cermet anodes for solid oxide fuel cells (SOFCs), that operate at temperatures typically around 700 – 900 °C. The conductivity of the cell controls the polarization loss of the cell which affects the overall efficiency of the fuel cell. In the current study, the effect of processing parameters on the conductivity of the anode cermet at room temperature is studied. The cermet is prepared with two different NiO vol. % and also sintered at two different temperatures. Different sintering temperatures lead to different microstructure and overall pore volume. The dependency of the conductivity on the microstructure, pore volume, sintering temperature and also the Ni content in the cermet are analyzed. The current analysis shows that the conductivity of the anode cermet strongly depends on the overall pore volume. Increase in sintering temperature reduces the pore volume and also reduces the active electrical conduction path. Increased density also decreases the active diffusion path which eventually means that there is a reduction in electrochemically active sites. These changes directly affect the efficiency of the cell. The Ni content in the cermet also influences the conductivity. The conductivity of the cermet varies with the Ni volume present in the cermet.
APA, Harvard, Vancouver, ISO, and other styles
9

Gerdes, Kirk, and Randall Gemmen. "Porous Anode Model for Coal Syngas Fuelled SOFC: Combined Mass and Energy Transport Normal to Cell Plane." In ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/fuelcell2008-65055.

Full text
Abstract:
Solid oxide fuel cells are being developed for integrated gasification combined cycle hybrid power systems. It is therefore necessary to evaluate the coupled temperature and concentration profiles for SOFC anodes exposed to coal syngas. In this work the SOFC anode was treated as a porous composite of 50/50 (volume) Ni / YSZ. Porous transport was modeled using the dusty gas model (DGM) and included two pore reactions, namely water gas shift and steam reforming of methane. The thermal transport model considered heat exchange by radiation between the interconnect and SOFC surface, convective transfer from bulk gas flow over the anode, heat generation terms due to pore reactions, and heat generation terms at the electrolyte boundary due to electrochemical reactions, ohmic heating, and concentration polarization. Composition profiles throughout the porous anode were considered for the DGM alone and were compared to the DGM including energy (DGME). The cases examined were for current densities ranging from 0.000–0.750 A/cm2 and for pressures from 1–19 atm absolute. Simulation results predict that the average cell operating temperature will increase 10 to 60°C relative to the furnace wall with inclusion of the energy equations. However, the thermal gradients within the anode are small due to the good thermal conductivity of the Ni-based anode. The effect of inclusion of energy transport on the hydrogen concentration profile is mixed depending on the independent parameter considered, with relative insensitivity to changes in the current density, but modest sensitivity to changes in operating pressure. Consideration of the thermal transport is important for determination of the interaction of coal syngas trace species with the anode, but is less critical for material stability.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Ni/YSZ pattern anodes' for particular source types:
Journal articles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography