Carbon deposition thresholds on nickel-based solid oxide fuel cell anodes I. Fuel utilization

Kuhn, Joel; Kesler, Olivera

doi:10.1016/j.jpowsour.2014.07.085

Cited by 18 publications

(10 citation statements)

References 50 publications

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“…Fuel cell specimens, seals, and testing hardware were identical to those described in part I [2]. Additionally, the test schedule also had the same structure as that described in part I, with an 18 h cycle time including a 10 h exposure to the carbon deposition gas mixture.…”

Section: Methodsmentioning

confidence: 99%

Carbon deposition thresholds on nickel-based solid oxide fuel cell anodes II. Steam:carbon ratio and current density

Kuhn

Kesler

2015

Journal of Power Sources

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Section: Methodsmentioning

confidence: 99%

Carbon deposition thresholds on nickel-based solid oxide fuel cell anodes II. Steam:carbon ratio and current density

Kuhn

Kesler

2015

Journal of Power Sources

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“…The deposited carbon covers the surface of Ni particles, which may deactivate the catalyst [1]. Besides, the deposited carbon blocks pores of the anode resulting in deterioration of mass transport, and it even induces irreversible damages to anode geometrical structures [11]. As a consequence, carbon deposition may cause a significant degradation of cell performance.…”

Section: Introductionmentioning

confidence: 99%

“…Current researches on carbon deposition of SOFCs are mainly focused on optimizing anode materials [6,[12][13][14][15][16][17][18][19][20][21][22] and operating conditions [5,7,8,11,[23][24][25][26][27][28][29]. Modifying/altering the catalyst of the Ni-based anode and adopting other anode materials such as perovskite are widely employed to develop more robust anodes immune to carbon deposition.…”

Section: Introductionmentioning

confidence: 99%

“…However, the formation of carbon deposition is seldom investigated. Carbon deposition can also be suppressed by proper selection of operating parameters, such as fuel types [5,7,8], molar ratio of steam to carbon [23,24], average current density [25,26], operating temperature [27,28], molar ratio of hydrogen to methane [29] and fuel utilization [11]. However, these parameters are interactional and the existing concluded adjusting strategies are sometimes inconsistent.…”

Section: Introductionmentioning

confidence: 99%

“…This model has superiority in revealing reforming reaction mechanisms, but it is cumbersome and timeconsuming to implement. Comparatively, the macroscopic reaction kinetic model is more effective [11,24,28,36]. Yang et al [28] adopted macroscopic reaction kinetic model to analyze the methane reforming process in the anode and found that a smaller Ni particle is more likely to cause carbon deposition.…”

Section: Introductionmentioning

confidence: 99%

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Lattice Boltzmann modeling of carbon deposition in porous anode of a solid oxide fuel cell with internal reforming

Han

Dong

2016

Applied Energy

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h i g h l i g h t sPore scale LB model is built for gas transfer and reaction in anode fed by methane. Local distributions of both position and amount of carbon deposition are presented. Anode microstructure and carbon deposition are correlated. Effect of heterogeneity of anode microstructure on carbon deposition is studied. Strategies for suppressing carbon deposition are obtained and analyzed. a b s t r a c tA pore scale Lattice Boltzmann (LB) model is developed for multi-component mass transport and carbon deposition in the porous anode of a solid oxide fuel cell (SOFC) fed with methane. In this model, the reforming and electrochemical reactions are discretely coupled via local molar fluxes of reactive gas species at catalytically active sites and triple phase boundaries (TPBs). By considering the heterogeneity of anode microstructure, the present pore scale LB model is capable of quantitatively predicting the local distributions of both the position and the amount of deposited carbon in the irregular porous anode. Using this model, the characteristics of carbon deposition in the anode are investigated. It is found that the heterogeneity of anode microstructure has significant influence on mass transport and carbon deposition. Increasing the pre-reforming extent of methane and decreasing the operating temperature are beneficial for the suppression of carbon deposition, whereas they will cause a relatively inferior cell performance. The LB model and results presented in this study are beneficial to mechanism investigation of carbon deposition. Furthermore, they are also helpful for studying the correlations between anode microstructure and carbon deposition and then bridging the manufacture of SOFC electrodes and their performance, which is useful to propose effective suggestions for avoiding performance degradation of SOFC induced by carbon deposition.

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Performance of Non‐Destructive Compressive Seals for Reversible Solid Oxide Cells

2017

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Contrary to hardened glass ceramics, compressive non‐destructive seals for solid oxide cells (SOCs) could enable stack repairs without utilizing destructive separation methods. In light of increasing interest for high temperature steam electrolysis and energy storage, the performances of two commercially available compressive materials were investigated in humidified gas conditions: Thermiculite‐866 and AFS‐170 alumina felts. Mass loss and thermogravimetric (TGA) experiments carried out in inert, oxidizing, and reducing atmospheres at 800 °C showed no influence of the atmosphere on the alumina felts, and a reversible redox behavior for Thermiculite‐866. Thermiculite‐866 showed better cyclability compared to AFS‐170 during SOC thermal cycling experiments. Initial open circuit voltages in dry H2 were measured and compared to those obtained with commercial mica seals. The highest were recorded with Thermiculite‐866, followed by mica and AFS‐170. The species outgassed by Thermiculite‐866 were quantified, and fluorine was found to be the main component released at 800 °C.

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Carbon deposition thresholds on nickel-based solid oxide fuel cell anodes I. Fuel utilization

Cited by 18 publications

References 50 publications

Carbon deposition thresholds on nickel-based solid oxide fuel cell anodes II. Steam:carbon ratio and current density

Carbon deposition thresholds on nickel-based solid oxide fuel cell anodes II. Steam:carbon ratio and current density

Lattice Boltzmann modeling of carbon deposition in porous anode of a solid oxide fuel cell with internal reforming

Performance of Non‐Destructive Compressive Seals for Reversible Solid Oxide Cells

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