Direct reforming of biogas on Ni-based SOFC anodes: Modelling of heterogeneous reactions and validation with experiments

Santarelli, Massimo; Quesito, Francesco; Novaresio, Valerio; Guerra, Cosimo; Lanzini, Andrea; Beretta, D.

doi:10.1016/j.jpowsour.2013.05.020

Cited by 37 publications

(21 citation statements)

References 21 publications

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“…Only the chemical reaction (20) has been considered in the quasi-equilibrium condition and the value of k 7 associated with a specific protective layer used was evaluated.…”

Section: Influence Of Fuel Cell Current Density On Sofc System Performentioning

confidence: 99%

“…There are some articles in the literature in the field of numerical modeling and experimental analysis of SOFC fed by biogas [20][21][22][23][24][25]. In all the simulation models [20,[22][23][24][25] a conventional Ni-YSZ SOFC anode without protective layer is considered, in [20,25] only the anodic electrochemical reaction of hydrogen consumption is considered, in [22][23][24] also the anodic electrochemical reaction of carbon monoxide consumption is considered and only in [23] the anodic electrochemical reaction of methane total oxidation is taken in account.…”

Section: Introductionmentioning

confidence: 99%

“…In all the simulation models [20,[22][23][24][25] a conventional Ni-YSZ SOFC anode without protective layer is considered, in [20,25] only the anodic electrochemical reaction of hydrogen consumption is considered, in [22][23][24] also the anodic electrochemical reaction of carbon monoxide consumption is considered and only in [23] the anodic electrochemical reaction of methane total oxidation is taken in account. Simulation models in [20,[22][23][24][25] consider only the chemical reactions of steam reforming and water gas shift in the anode.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermoelectric characterization of an intermediate temperature solid oxide fuel cell system directly fed by dry biogas

Lorenzo

Corigliano

Faro

et al. 2016

Energy Conversion and Management

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“…Only the chemical reaction (20) has been considered in the quasi-equilibrium condition and the value of k 7 associated with a specific protective layer used was evaluated.…”

Section: Influence Of Fuel Cell Current Density On Sofc System Performentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermoelectric characterization of an intermediate temperature solid oxide fuel cell system directly fed by dry biogas

Lorenzo

Corigliano

Faro

et al. 2016

Energy Conversion and Management

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“…Measurements at open circuit by Gaula et al, for varying p CH 4 /p CO 2 indicates the absence of carbon deposition at low CO 2 /CH 4 ratios (<1) on conventional Ni/YSZ anode [5]. Whereas, a report by Santarelli et al claims the absence of carbon deposition at much higher CO 2 /CH 4 ratios (2.33-4) again on Ni/YSZ anode [9]. Several approaches to suppress carbon deposition by anode modification have also been reported in the literature [6,10,11] Although there are handful of experimental studies available for the direct biogas reforming in SOFCs, modeling studies are scarce in the literature.…”

Section: Introductionmentioning

confidence: 95%

“…Several approaches to suppress carbon deposition by anode modification have also been reported in the literature [6,10,11] Although there are handful of experimental studies available for the direct biogas reforming in SOFCs, modeling studies are scarce in the literature. Santarelli et al analyzed the performance of an anode supported (1.7 mm) tubular SOFC using previously published models and kinetics from the literature [9]. The study essentially focused on validating the exit gas composition under different current loads and CO 2 /CH 4 ratios.…”

Section: Introductionmentioning

confidence: 99%

Internal reforming of biogas in SOFC: a model based investigation

Janardhanan

2015

J Solid State Electrochem

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This paper presents a multiphysics model for the simulation of solid oxide fuel cell operating on biogas without external reforming. The model accounts for multicomponent species transport, heterogeneous reaction kinetics on Ni cermet anode, H 2 electrochemical oxidation, and charge transport in the cermet electrodes and electrolyte. The model uses only three adjustable parameters that are fitted against one set of experimental data and then kept constant throughout the study. The model predicted voltage fluctuations are in excellent agreement with experimental measurements reported in the literature. The model also reveals that the assumption of H 2 as the only electrochemically active species is probably inadequate to explain the behavior of cells operating directly on biogas. Thermodynamic analysis is further performed to support this claim made based on model predictions. The model results demonstrate that the thickness of electrochemically active layer is independent of fuel composition under fuel rich conditions, however, thins down as the fuel becomes more and more diluted.

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Evaluating the drop of electrochemical performance of Ni/YSZ and Ni/ScSZ solid oxide fuel cells operated with dry biogas

Arifin

Shamsuddin

Steinberger‐Wilckens

2020

Intl J of Energy Research

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This work is aimed at evaluating the influence of carbon deposition on the power density drop of in-house fabricated Ni/YSZ and Ni/ScSZ solid oxide fuel cells (SOFCs) operating in dry internal reforming of simulated biogas (CH 4 / CO 2 = 2). An immediate drop of open-circuit voltage (OCV) and maximum power densities is observed when the fuel changes from hydrogen to biogas, 86.5% and 33.3% for the Ni/YSZ and Ni/ScSZ cells, respectively with mass transfer polarisation dominates Ni/YSZ polarisation. Carbon deposition is investigated as the cause of the reduction in performance by quantification of deposited carbon by temperature programmed oxidation (TPO) and catalytic activity test. Results from TPO analysis show unexpectedly higher amount of carbon on the Ni/ScSZ cells (2.35 × 10 −3 mgC/mg cat) as compared to Ni/YSZ (5.68 × 10 −4 mgC/mg cat) despite higher performance of the former. Catalytic activity tests reveal a low carbon oxidation rate compared to an initially higher methane decomposition reaction, leading to carbon deposition in both cells, in which the methane decomposition reaction of Ni/ScSZ is higher. Different effects are observed on the pellets, where the carbon deposited on Ni/YSZ deactivates the reforming reaction sites as quick as 20 minutes into the operation, whereas carbon deposited on the Ni/ScSZ pellet did not show the same blocking effect on the catalyst due to the different carbon morphology formed. A graphitic whisker-like rod structure is observed on Ni/ScSZ while amorphous non-crystalline carbon covers the Ni/YSZ pellets with 3 hours exposure to high methane content dry biogas (CH 4 /CO 2 = 2). The difference of carbon structure affects the amount of carbon quantified in the TPO analysis where most of the amorphous carbon oxidises while some of the graphitic carbon deposits remain.

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Direct reforming of biogas on Ni-based SOFC anodes: Modelling of heterogeneous reactions and validation with experiments

Cited by 37 publications

References 21 publications

Thermoelectric characterization of an intermediate temperature solid oxide fuel cell system directly fed by dry biogas

Thermoelectric characterization of an intermediate temperature solid oxide fuel cell system directly fed by dry biogas

Internal reforming of biogas in SOFC: a model based investigation

Evaluating the drop of electrochemical performance of Ni/YSZ and Ni/ScSZ solid oxide fuel cells operated with dry biogas

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