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

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dc.citedby7
dc.contributor.authorArifin N.A.en_US
dc.contributor.authorShamsuddin A.H.en_US
dc.contributor.authorSteinberger-Wilckens R.en_US
dc.contributor.authorid57195493347en_US
dc.contributor.authorid35779071900en_US
dc.contributor.authorid6603141340en_US
dc.date.accessioned2023-05-29T09:08:43Z
dc.date.available2023-05-29T09:08:43Z
dc.date.issued2021
dc.descriptionAmorphous carbon; Biogas; Catalyst activity; Catalytic oxidation; Deposition; Mass transfer; Methane; Nickel oxide; Open circuit voltage; Pelletizing; Polarization; Carbon structures; Different effects; Electrochemical performance; Internal reforming; Maximum power density; Methane decomposition; Solid oxide fuel cells (SOFCs); Temperature programmed oxidation; Solid oxide fuel cells (SOFC)en_US
dc.description.abstractThis 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 (CH4/CO2 = 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/mgcat) as compared to Ni/YSZ (5.68 � 10?4 mgC/mgcat) 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 (CH4/CO2 = 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. � 2020 John Wiley & Sons Ltden_US
dc.description.natureFinalen_US
dc.identifier.doi10.1002/er.6233
dc.identifier.epage6417
dc.identifier.issue4
dc.identifier.scopus2-s2.0-85097264402
dc.identifier.spage6405
dc.identifier.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85097264402&doi=10.1002%2fer.6233&partnerID=40&md5=980211b71f0b46f5c20a1450fe010b66
dc.identifier.urihttps://irepository.uniten.edu.my/handle/123456789/26286
dc.identifier.volume45
dc.publisherJohn Wiley and Sons Ltden_US
dc.relation.ispartofAll Open Access, Bronze
dc.sourceScopus
dc.sourcetitleInternational Journal of Energy Research
dc.titleEvaluating the drop of electrochemical performance of Ni/YSZ and Ni/ScSZ solid oxide fuel cells operated with dry biogasen_US
dc.typeArticleen_US
dspace.entity.typePublication
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