Mathematical modeling of Ni/GDC and Au–Ni/GDC SOFC anodes performance under internal methane steam reforming conditions

Souentie, Stamatios; Athanasiou, Michail; Niakolas, Dimitrios K.; Katsaounis, Alexandros; Neophytides, Stylianos G.; Vayenas, C.G.

doi:10.1016/j.jcat.2013.06.015

Cited by 48 publications

(39 citation statements)

References 66 publications

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“…The latter can be corroborated by similar observation from European Fuel Cell Group IEA Advanced Fuel Cell Programme (1994) where significant non-faradaic decrease of the carbon deposition rate was observed during the steam reforming of methane upon polarization of the Ni/YZS electrode. In addition in the case of Ni/GDC operating under S/C = 1 the supply of O 2− to the electrode induced around 25% decrease in the rate of the steam reforming reaction at current densities as high as 250 mA/cm 2 (Souentie et al, 2013). In general it was observed that the decrease in the steam reforming reaction rate was equal to the applied current onto the Ni/GDC electrode.…”

Section: Kinetics Of the Ch 4 Steam Reforming Reaction On Ni Based Cementioning

confidence: 87%

“…Beyond the decrease in CH 4 consumption rate the inhibiting effect of the applied current on the steam reforming reaction is also deduced by the fact that the sum of the slopes determining the CO and H 2 consumption rates is >1 that corresponds to the faradaic consumption of H 2 +CO. It is estimated that the rate of steam reforming reaction is decreased even up to 25% at the highest applied current density I = 230 mA/cm 2 (Souentie et al, 2013). It is worth noting that no CO 2 formation rate is observed even under fuel cell operation conditions.…”

Section: Electrokinetics and Carbon Tolerance Of Niau/gdc Anodes Undementioning

confidence: 98%

“…It can be assumed as a mixture of the following catalytic and electrochemical reactions, which proceed in parallel and/or in series (Maier et al, 2011;Niakolas et al, 2013;Souentie et al, 2013) …”

Section: Introductionmentioning

confidence: 99%

“…In addition, CH 4 can be partially oxidized electrochemically toward the production of H 2 and CO (Bebelis et al, 2000(Bebelis et al, , 2006Souentie et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…In this direction our research group with collaborators (Niakolas et al, 2010Papaefthimiou et al, 2013;Souentie et al, 2013;Neofytidis et al, 2015) attempted to study and modify NiO/YSZ and NiO/GDC powder with Au and/or Mo nano-particles. These modifications resulted in electrodes with high tolerance and improved electrocatalytic activity under both carbon forming and sulfur poisoning conditions.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Au and/or Mo Doping on the Development of Carbon and Sulfur Tolerant Anodes for SOFCs—A Short Review

Niakolas

Neofytidis

Neophytides

2017

Front. Environ. Sci.

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HIGHLIGHTS• The kinetics of CH 4 steam reforming and partial oxidation are determined by the oxidation rate of CH x adsorbed species • The modification of the Ni/YSZ and Ni/GDC with Au and/or Au-Mo results in differentiated structures of atomically dispersed Au and/or Au-Mo at the surface and the bulk of the Ni particles.• At lean S/C NiAu/YSZ selectively oxidizes electrochemically the catalytically produced H 2 and CO, while NiAu/GDC is selective to the direct partial electrochemical oxidation of CH 4 to CO and H 2.• The modified electrodes show significant tolerance to C formation.• Au-Mo modification enhances the intrinsic sulfur tolerance properties of Ni/GDC.The presented work is a short review of the research attempts from our group with collaborators, during the last 15 years, which had as main objective to study and improve the electrocatalytic performance of Ni-based electrode materials for the CH 4 Internal steam Reforming process (ISR.) in Solid Oxide Fuel Cells (SOFCs). In particular, NiO/YSZ and NiO/GDC anode powders were modified with Au and/or Mo nano-particles via different preparation methods. These efforts resulted in anode materials with high tolerance and improved electrocatalytic activity under both carbon forming and sulfur poisoning conditions. The most important findings are being reviewed and critical findings are being highlighted 50 as to stress the key differences in the electrocatalytic performance between Ni/YSZ and Ni/GDC. The possible effects of Au and/or Mo addition on the physicochemical and strucutral properties of the cermets are thoroughly discussed as well as active functional layers in the form of anode SOFC electrodes.

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Section: Kinetics Of the Ch 4 Steam Reforming Reaction On Ni Based Cementioning

confidence: 87%

Section: Electrokinetics and Carbon Tolerance Of Niau/gdc Anodes Undementioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

“…In addition, CH 4 can be partially oxidized electrochemically toward the production of H 2 and CO (Bebelis et al, 2000(Bebelis et al, , 2006Souentie et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of Au and/or Mo Doping on the Development of Carbon and Sulfur Tolerant Anodes for SOFCs—A Short Review

Niakolas

Neofytidis

Neophytides

2017

Front. Environ. Sci.

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The Reduction Properties of M–Doped (M=Zr, Gd) CeO₂/YSZ Scaffolds Co–Infiltrated with Nickel

et al. 2018

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In recent years infiltration of materials into porous ceramic scaffolds has been shown to be an effective way of creating catalytically active components for solid oxide fuel cells (SOFCs). However, the redox properties of these novel structures are not well understood. Here, we use X-ray photoelectron spectroscopy (XPS) and in-situ Raman spectroscopy to investigate the oxidation properties of yttriastabilised zirconia (YSZ) scaffolds infiltrated with ceria (CeO 2 ), gadolinium-doped ceria (GDC) and zirconia-doped ceria (ZDC), with and without Ni. XPS shows that doping ceria with zirconia increases the ratio of Ce 3 + to Ce 4 + , while gadolinium doping results in a decrease of Ce 3 + . The presence of Ni increases the Ce 3 + /Ce 4 + ratio for CeO 2 and GDC, but had little effect on ZDC. We used the shift of the F 2g Raman peak to monitor in-situ, the oxidation state of ceria. In the asmade compounds, we show that while the gadolinium and zirconium dopants significantly change the oxidation characteristics of ceria, the resulting materials are only significantly reduced above 500°C when co-infiltrated with Ni. In-situ Raman monitoring during reduction as a function of temperature showed that while ZDC reduces much more readily than undoped ceria or GDC, the presence of Ni dominated the reduction dynamics. software package as it required a more complicated background subtraction.

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Preparation of Cerium‐Doped Mesoporous γ‐Alumina Supported Nickel Catalysts for Pre–reforming of Liquefied Petroleum Gas under Low Steam to Carbon Ratio

et al. 2016

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Cerium‐doped mesoporous γ‐alumina supported nickel oxides (NiO/Ce–γ‐MA) were prepared via one‐pot hydrolysis of inorganic salts without surfactants and applied for pre‐reforming of liquefied petroleum gas (LPG) under a low steam to carbon molar ratio of 1.2. Influences of Ce contents on catalyst structure, interaction between Ni species and support, dispersion of nickel species and Ni particle sizes were investigated in detail. The NiO/Ce–γ‐MA materials possessed large surface areas and narrow pore size distributions with homogenously‐dispersed Ni oxide species in the matrices. Upon H2 reduction, uniform Ni crystallites were formed in the γ‐alumina frameworks. The addition of Ce could significantly promote the dispersion of nickel species and lower Ni crystallite sizes, improving the catalytic properties of the reduced Ni/Ce–γ‐MA catalyst. The Ni/Ce–γ‐MA catalyst containing 7 wt% Ce produced the smallest sub‐4‐nm Ni particles, resulting in the most excellent catalytic activity and stability with less than 1 wt% carbon deposition during the 100‐h reaction time for LPG pre‐reforming.

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Mathematical modeling of Ni/GDC and Au–Ni/GDC SOFC anodes performance under internal methane steam reforming conditions

Cited by 48 publications

References 66 publications

Effect of Au and/or Mo Doping on the Development of Carbon and Sulfur Tolerant Anodes for SOFCs—A Short Review

Effect of Au and/or Mo Doping on the Development of Carbon and Sulfur Tolerant Anodes for SOFCs—A Short Review

The Reduction Properties of M–Doped (M=Zr, Gd) CeO₂/YSZ Scaffolds Co–Infiltrated with Nickel

Preparation of Cerium‐Doped Mesoporous γ‐Alumina Supported Nickel Catalysts for Pre–reforming of Liquefied Petroleum Gas under Low Steam to Carbon Ratio

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Mathematical modeling of Ni/GDC and Au–Ni/GDC SOFC anodes performance under internal methane steam reforming conditions

Cited by 48 publications

References 66 publications

Effect of Au and/or Mo Doping on the Development of Carbon and Sulfur Tolerant Anodes for SOFCs—A Short Review

Effect of Au and/or Mo Doping on the Development of Carbon and Sulfur Tolerant Anodes for SOFCs—A Short Review

The Reduction Properties of M–Doped (M=Zr, Gd) CeO2/YSZ Scaffolds Co–Infiltrated with Nickel

Preparation of Cerium‐Doped Mesoporous γ‐Alumina Supported Nickel Catalysts for Pre–reforming of Liquefied Petroleum Gas under Low Steam to Carbon Ratio

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The Reduction Properties of M–Doped (M=Zr, Gd) CeO₂/YSZ Scaffolds Co–Infiltrated with Nickel