Assessment of the performance of Ni-yttria-stabilized zirconia anodes in anode-supported Solid Oxide Fuel Cells operating on H2–CO syngas fuels

Ye, Xiaofeng; Wang, S.R.; Zhou, Jing; Fan-rong, Zeng; Nie, Hongjiao; Wen, Tian

doi:10.1016/j.jpowsour.2010.04.016

Cited by 31 publications

(26 citation statements)

References 13 publications

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“…Comparison of polarization characteristics between model and data from Costa-Nunes et al 40 at 700 • C for hydrogen (97% H 2 + 3% H 2 O), syngas (25% H 2 + 25% CO + 50% N 2 ) and CO (99.9% CO + 0.1% CO 2 ). 41 at 750 • C for hydrogen (97% H 2 + 3% H 2 O), syngas #1 (47% H 2 + 47% CO + 6% H 2 O) and syngas #3 (42% H 2 + 42% CO + 16% H 2 O).…”

Section: A I (Mol Cm S) E Aimentioning

confidence: 99%

“…• C. 41 In this section, air leakage is not included in the model because predicted and experimental open-circuit voltages match well for these data sets. The version of the model adopted in this section also accounts for detailed transport and charge-transfer in the cathode 42 because experimental cathode overpotentials were not provided by these groups.…”

mentioning

confidence: 99%

“…This data set 40 (in Figure 12) and at 750 • C from Ye et al 41 (in Figure 13) is particularly well-suited for testing this model because it contains pure hydrogen, pure CO and syngas mixtures. The most noticeable discrepancy between the model and experimental data occurs in the syngas data set.…”

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confidence: 99%

“…• C. The polarization curves for this model are compared to experimental data from Ye et al 41 at 750…”

mentioning

confidence: 99%

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Investigation of a Combined Hydrogen and Oxygen Spillover Mechanism for Syngas Electro-Oxidation on Ni/YSZ

Ong

Hanna

Ghoniem

2016

J. Electrochem. Soc.

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An accurate, comprehensive model for the individual and simultaneous electro-oxidation of H 2 and CO on Ni-YSZ is necessary to predict SOFC performance for a range of gaseous fuels. A mechanism that combines hydrogen (H) spillover to YSZ with oxygen (O) spillover to nickel is implemented in a previously-validated 1D-MEA model with detailed gas-phase transport and surface reforming kinetics in the anode. This model is then successfully fitted to a wide range of experimental polarization data for fuel mixtures. The H and O spillover pathways are then investigated in depth for two anode fuel mixtures: 20% H 2 + 80% N 2 and 20% H 2 + 80% CO. Although these studies confirm that H spillover is typically the dominant source of current, they also show that the current produced by O spillover is non-negligible at higher currents. Furthermore, it is observed that H 2 adsorption to nickel becomes the rate-limiting step at high currents in the hydrogen pathways, while the current produced by O spillover to C O(Ni) is never limited by the rate of CO adsorption. The model is then successfully compared to two independent lower temperature data sets. Together these results demonstrate that it is important to model both spillover pathways on Ni/YSZ and to account for rate-limiting H 2 adsorption at high currents. The thermochemical and electrochemical reaction mechanisms within a SOFC anode are complex, particularly when hydrocarbon species are involved.1-3 Elementary reaction steps are needed to accurately depict gas-phase chemistry, heterogeneous surface reforming, and heterogeneous charge-transfer reactions. Understanding the governing mechanisms for internal reforming and electrochemistry is paramount to optimize anode structure and operating conditions. More specifically, it is critical to identify the correct rate-limiting steps in these elementary mechanisms because those steps control the rate at which the cell can produce current. The elementary electro-oxidation reaction mechanisms for H 2 and CO require special attention because both of these fuels are dominant in practical SOFC fuel streams like reformed natural gas, coal syngas and biogas. 4 A couple of reaction mechanism types have been proposed to represent H 2 electrochemical oxidation at the triple-phase boundary (TPB) of Ni-YSZ: (1) hydrogen spillover and (2) oxygen spillover. Hydrogen (H) spillover mechanisms involve a charge-transfer step where hydrogen spills over from nickel to YSZ to react with oxygen. Oxygen (O) spillover mechanisms, on the other hand, involve a charge-transfer step where oxygen spills over from YSZ to nickel to react with hydrogen. Hydrogen electro-oxidation models typically select only one spillover pathway rather than implementing both the H and O spillover pathways simultaneously. Although a few researchers have used O spillover mechanisms to describe H 2 electro-oxidation, 5,6 the majority have implemented H spillover mechanisms.7-14 A few researchers have compared these two pathways and concluded that H spillover mechanisms are bett...

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Section: A I (Mol Cm S) E Aimentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

“…• C. The polarization curves for this model are compared to experimental data from Ye et al 41 at 750…”

mentioning

confidence: 99%

See 2 more Smart Citations

Investigation of a Combined Hydrogen and Oxygen Spillover Mechanism for Syngas Electro-Oxidation on Ni/YSZ

Ong

Hanna

Ghoniem

2016

J. Electrochem. Soc.

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“…As nickel is considered an active catalyst for carbon synthesis (Gorte 2003) it is suspected that decreasing the flow rate through the cell dramatically increases the residence time, resulting in carbon deposition and subsequent cell deactivation (Miao 2010, Ye 2010. This theory is supported by carbon balance calculations and time on stream measurements, which indicates a rapid but 10 reversible decrease in cell performance.…”

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confidence: 95%

The effect of synthesis gas composition on the performance of Ni-based solid oxide fuel cells

Drewery

Kennedy

Alenazey

et al. 2015

Chemical Engineering Research and Design

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.Page 1 AbstractAn increased interest in using hydrocarbons in solid oxide fuel cells for the production of power has 20 led to research into operation on synthesis (syn) gas, a mixture of hydrogen and carbon monoxide.Hydrocarbons are typically reformed, either internally or in an external reformer prior to the fuel cell, producing syngas with various H 2 :CO ratios depending on the hydrocarbon used. This paper examines the effect of varying the H 2 :CO ratio with respect to C 1 to C 4 steam reforming reactions and additionally a mixture containing a higher ratio of carbon monoxide. It was found that there was no 25 significant relationship between cell performance and H 2 :CO ratio when a high feed rate was employed. For low flow rates, however, the high carbon monoxide concentration resulted in a significant decrease in cell performance. It was determined that this was caused by reversible carbon deposition as opposed to a decrease in carbon monoxide reactivity.

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Behavior of anode-supported SOFCs under simulated syngases

Miao

Liu

Chen

et al. 2014

J Solid State Electrochem

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Assessment of the performance of Ni-yttria-stabilized zirconia anodes in anode-supported Solid Oxide Fuel Cells operating on H2–CO syngas fuels

Cited by 31 publications

References 13 publications

Investigation of a Combined Hydrogen and Oxygen Spillover Mechanism for Syngas Electro-Oxidation on Ni/YSZ

Investigation of a Combined Hydrogen and Oxygen Spillover Mechanism for Syngas Electro-Oxidation on Ni/YSZ

The effect of synthesis gas composition on the performance of Ni-based solid oxide fuel cells

Behavior of anode-supported SOFCs under simulated syngases

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