Electrochemical Oxidation of H[sub 2] and CO in a H[sub 2]-H[sub 2]O-CO-CO[sub 2] System at the Interface of a Ni-YSZ Cermet Electrode and YSZ Electrolyte

Matsuzaki, Yoshio; Yasuda, Isamu

doi:10.1149/1.1393409

Cited by 216 publications

(127 citation statements)

References 8 publications

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“…Therefore, the lowest frequency peak (<1 Hz) could be attributed to CO conversion, by analogy to the analysis of the (dry-humid) case. This peak being at a lower frequency compared to the H 2 conversion peak (2 Hz) is consistent with the fact that electrochemical conversion of CO on Ni-YSZ is known to be slower than that of H 2 [25,26]. Furthermore, this low-frequency peak is negligible at 710°C and becomes significant only above 760°C, indicating that CO is only scarcely electrochemically converted at 710°C.…”

Section: Comparison Of Performance With Dry and Humid Mixtures: Effecsupporting

confidence: 82%

“…Matsuzaki and co-workers have shown that, in H 2 /CO mixtures, the water-gas shift reaction plays an important role because it is much faster than the oxidation reactions [26]. Therefore, the intermediate peaks could be related to the additional H 2 production through the water-gas shift reaction.…”

Section: Comparison Of Performance With Dry and Humid Mixtures: Effecmentioning

confidence: 99%

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Ethanol internal steam reforming in intermediate temperature solid oxide fuel cell

Diethelm¹,

herle²

2011

Journal of Power Sources

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This study investigates the performance of a standard Ni-YSZ anode supported cell under ethanol steam reforming operating conditions. Therefore, the fuel cell was directly operated with a steam/ethanol mixture (3 to 1 molar). Other gas mixtures were also used for comparison to check the conversion of ethanol and of reformate gases (H 2 , CO) in the fuel cell. The electrochemical properties of the fuel cell fed with 4 different fuel compositions were characterized between 710 and 860°C by I-V and EIS measurements at OCV and under polarization. In order to elucidate the limiting processes, impedance spectra obtained with different gas compositions were compared using the derivative of the real part of the impedance with respect of the natural logarithm of the frequency.Results show that internal steam reforming of ethanol takes place significantly on Ni-YSZ anode only above 760°C. Comparisons of results obtained with reformate gas showed that the electrochemical cell performance is dominated by the conversion of hydrogen. The conversion of CO also occurs either directly or indirectly through the water-gas shift reaction but has a significant impact on the electrochemical performance only above 760°C.

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Section: Comparison Of Performance With Dry and Humid Mixtures: Effecsupporting

confidence: 82%

Section: Comparison Of Performance With Dry and Humid Mixtures: Effecmentioning

confidence: 99%

Ethanol internal steam reforming in intermediate temperature solid oxide fuel cell

Diethelm¹,

herle²

2011

Journal of Power Sources

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“…These assumptions can be compared to the result from Matsuzaki and Yasuda in [47], where it was concluded that the electrochemical oxidation rate of H 2 at the interface in a porous…”

Section: Electrochemical Reactionsmentioning

confidence: 99%

“…Carbon monoxide can be oxidized in the electrochemical reaction, but also reacts with water in the WGSR [48]]. Note that the WGSR is in general much faster than the carbon monoxide electrode reaction [47][48][49]. Methane reacts with steam in the MSR.…”

Section: Internal Reforming Reactionsmentioning

confidence: 99%

SOFC modeling considering hydrogen and carbon monoxide as electrochemical reactants

Andersson

Yuan

Sundén

2013

Journal of Power Sources

125

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Fuel cells are promising for future energy systems, because they are energy efficient and able to use renewable fuels. A fully coupled computational fluid dynamics (CFD) approach based on the finite element method, in twodimensions, is developed to describe a solid oxide fuel cell (SOFC). Governing equations for, gas-phase species, heat momentum, ion and electron transport are implemented and coupled to kinetics describing electrochemical and internal reforming reactions. Both carbon monoxide and hydrogen are considered as electrochemical reactants within the anode. The predicted results show that the current density distribution along the main flow direction depends on the local concentrations and temperature. A higher (local) fraction of electrochemical reactants increases the Nernst potential as well as the current density. For fuel mixtures without methane, the cathode air flow rate needs to be increased significantly to avoid high temperature gradients within the cell as well as a high outlet temperature.

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“…Similarly, impedance spectroscopy was used to examine the effect of carbon monoxide concentration, where it was identified that increasing CO produced increased carbon deposition with the exception of the cell being operated on pure carbon monoxide, implying that the mechanism of carbon formation is via a hydrogen assisted CO dissociation route (Alzate-Restrepo 2010). Matsuzaki and Yasuda also identified an increased 20 polarisation resistance with increased carbon monoxide concentration, however the lower rate of chemical oxidation was attributed to a larger diffusion resistance of carbon monoxide compared to hydrogen (Matsuzaki 2000). This paper examines the effects of H 2 :CO ratios in syngas on a commercially available scandia doped 25 zirconia electrolyte utilising a nickel anode.…”

mentioning

confidence: 99%

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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Electrochemical Oxidation of H[sub 2] and CO in a H[sub 2]-H[sub 2]O-CO-CO[sub 2] System at the Interface of a Ni-YSZ Cermet Electrode and YSZ Electrolyte

Cited by 216 publications

References 8 publications

Ethanol internal steam reforming in intermediate temperature solid oxide fuel cell

Ethanol internal steam reforming in intermediate temperature solid oxide fuel cell

SOFC modeling considering hydrogen and carbon monoxide as electrochemical reactants

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

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