Effect of air addition to methane on performance stability and coking over NiO–YSZ anodes of SOFC

Aslannejad, Hamed; Barelli, Linda; Babaie, Amin; Bozorgmehri, Shahriar

doi:10.1016/j.apenergy.2016.05.127

Cited by 47 publications

(16 citation statements)

References 27 publications

(31 reference statements)

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“…Additionally, taking into account that no visual carbon was found after dismantling the cells, the coke resistance in this case is thereby well-proved. The lower power density results with dry methane when compared to those in hydrogen could be elucidated by the fact that the system was dominated by the concentration polarisation whilst running with heavier fuels such as methane [4]. It also should be pointed out that an electrolyte-supported cell was used in the present work, which might result in lower performance, due to higher ohmic polarisation.…”

Section: Post-mortem Characterisationmentioning

confidence: 92%

“…Furthermore, the strategies for utilising hydrocarbons as fuels within nickel-based anodes are mainly focused on the reaction process in which the fuels are fed with an oxidising agent such as water or carbon dioxide [4][5][6][7][8]. The oxidising agent promotes fuel reforming within the anode (internal reforming) and thus produces a hydrogen-rich product such as syngas of hydrogen and carbon monoxide, which can be fully oxidised within the anode, thereby avoiding undesirable carbon deposition.…”

Section: Introductionmentioning

confidence: 99%

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Influence of novel anode design on the performance and coke resistance towards methane directly-fed solid oxide fuel cells

Sarruf

Hong

Steinberger‐Wilckens

et al. 2020

Ceramics International

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The direct utilisation of primary fuels such as natural gas, green methane or ethanol represents a transition step towards a cleaner energy-based society. This work shows the influence of a nickel-free intermediate anode layer, and a ceria-based functional anode composite, on solid oxide fuel cell (SOFC) performance when directly utilising dry methane without fuel pre-reforming. A CeO 2-Co 3 O 4-CuO electrocatalyst was investigated by X-ray diffraction and X-ray fluorescence to confirm the presence of CeO 2 , Co 3 O 4 , and CuO phases. To avoid thermal mismatches between the anode/electrolyte, an anode intermediate layer was developed and tested, with the aim of enhancing the thermal and chemical compatibility of components and oxygen ion transfer within the anode. The electrochemical properties of the assembled cells were evaluated by measuring i-V plots and electrochemical impedance spectra. The addition of the intermediate layer substantially decreased the polarisation resistance of the cell and increased the electrochemical performance of the cell 2.5-to 5.5-fold depending on which fuel was being utilised. Scanning electron microscopy was performed to observe the integrity of the microstructure morphology of both anode assemblies. The utilisation of dry methane was shown to be viable for operation from 750 to 850˚C within the developed cells. Furthermore, Raman spectroscopy and temperature-programmed oxidation tests confirmed that carbon deposition over the anode surface was negligible within the proposed configuration and materials design. Accordingly, this study reveals that the addition of the intermediate layer is promising for improving SOFC performance and mitigating carbon coking under direct methane-fuelled operation.

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Section: Post-mortem Characterisationmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Influence of novel anode design on the performance and coke resistance towards methane directly-fed solid oxide fuel cells

Sarruf

Hong

Steinberger‐Wilckens

et al. 2020

Ceramics International

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“…The deposited carbon can block the porous anode and increases diffusion resistance of fuel gas allowing cell performance reduction [14]. Some researchers have added some oxidizing agents such as H 2 O, CO 2 , or O 2 to reform the hydrocarbon fuel internally, and the method was called as direct internal reforming (DIR) [15,16].…”

Section: Introductionmentioning

confidence: 99%

Ceramic Protective Coatings for Cordierite-Mullite Refractory Materials

Вахула¹,

Pona²,

Солоха³

et al. 2021

ChChT

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The issue of cordierite-mullite refractories protection from the influence of aggressive factors is considered. The interaction between the components of protective coatings has been studied. It has been investigated that in the systems based on poly(methylphenylsiloxane) filled with magnesium oxide, alumina and quartz sand, the synthesis of cordierite (2MgO•2Al2O3•5SiO2), mullite (3Al2O3•2SiO2) or magnesium aluminate spinel (MgO•Al2O3) is possible. The basic composition of the protective coating, which can be recommended for the protection of cordierite-mullite refractory, is proposed.

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“…Several strategies had been introduced to tackle this problem where most of them focusing on the modification of anode layer compared to the electrolyte layer. Such modification increases the O:C ratio by the addition of oxygen containing gases into the anodic feeding gas, modifying the surface of the nickel particles by the introduction of other metal(s) into the nickel cermet anode, promoting the carbon elimination reaction by increasing the polarization current, and altering the anode structure and anode surface using other active oxide(s) or using anode barrier layers 9,10 …”

Section: Introductionmentioning

confidence: 99%

“…Such modification increases the O:C ratio by the addition of oxygen containing gases into the anodic feeding gas, modifying the surface of the nickel particles by the introduction of other metal(s) into the nickel cermet anode, promoting the carbon elimination reaction by increasing the polarization current, and altering the anode structure and anode surface using other active oxide(s) or using anode barrier layers. 9,10 Even so, electrolyte layer also plays an important role in providing the durability needed for CH 4 -based microtubular solid oxide fuel cell (MT-SOFC). Other than being the barrier layer in separating fuel and oxidant at the anode and cathode sites which require dense and gastight properties, optimum electrolyte thickness also contributes to the prevention of crack on the cell from happening after carbon deposition took place.…”

Section: Introductionmentioning

confidence: 99%

Effect of electrolyte thickness manipulation on enhancing carbon deposition resistance of methane‐fueled solid oxide fuel cell

et al. 2020

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Summary Dual‐layer hollow fiber (DLHF) micro‐tubular solid oxide fuel cell (MT‐SOFC) consisting of nickel oxide‐yttria‐stabilized zirconia (NiO‐YSZ) anode/YSZ electrolyte was fabricated via a single‐step phase inversion‐based co‐extrusion/co‐sintering technique in order to investigate the effect of different electrolyte extrusion rates (1‐5 mL min−1) at different sintering temperature (1350°C, 1400°C, and 1450°C) under methane (CH4) condition. The DLHF co‐sintered at 1450°C was chosen as optimum temperature due to the good mechanical strength and gas‐tight property. Meanwhile, 18 to 34 μm of electrolyte thickness was achieved when electrolyte extrusion rate increase from 1 to 5 mL min−1. Power density as high as 0.32 W cm−2 was obtained on the cell with the electrolyte layer of 18 μm in thickness (DLHF1) which is 20% higher than the cell with an electrolyte layer of 34 μm (DLHF5) which was only 0.12 W cm−2 when operated at 850°C. However, DLHF1 had suffered cracking formation that originated from anode site which shortened the stability test duration to only 8 hours of survival under 750°C. While DLHF5 can operate up to 15 hours but an increase in electrolyte thickness had resulted in higher ohmic area‐specific resistance that lowering the power density. Fifty‐seven percent reduction in cell performance was observed under methane condition when compared to the cell that performs using hydrogen gas due to the carbon deposition as proven by Raman spectroscopy and carbon, hydrogen, nitrogen, and sulfur analyzer.

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Effect of air addition to methane on performance stability and coking over NiO–YSZ anodes of SOFC

Cited by 47 publications

References 27 publications

Influence of novel anode design on the performance and coke resistance towards methane directly-fed solid oxide fuel cells

Influence of novel anode design on the performance and coke resistance towards methane directly-fed solid oxide fuel cells

Ceramic Protective Coatings for Cordierite-Mullite Refractory Materials

Effect of electrolyte thickness manipulation on enhancing carbon deposition resistance of methane‐fueled solid oxide fuel cell

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