Detailed Study of Sulfur Poisoning and Recovery of Ni-YSZ-Based Anodes Operating up to 1.8 W cm-2 in a Biogas Fuel

Ni-YSZ (nickel-yttrium-stabilized zirconia) is a common anode for solid oxide fuel cells (SOFCs) because of its excellent catalytic performance and electronic conductivity. It shows that the nickel anode-supported cell exhibits good cell performance in a biogas fuel of 36CH4-36CO2-20H2O-4H2-4CO. Unf...

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Bibliographic Details
Published inInternational journal of energy research Vol. 2023; pp. 1 - 14
Main Authors Ma, Jianjun, Jiang, Yao, Connor, Paul A., Gamble, Stephen R., Cassidy, Mark, Jiang, Cairong, Irvine, John T. S.
Format Journal Article
LanguageEnglish
Published Bognor Regis Hindawi 16.02.2023
Hindawi Limited
Subjects
Alternative energy sources
Anodes
Barium
Barium zirconates
Biogas
Biomass
Carbon
Catalysts
Circuits
Deactivation
Degradation
Fuel technology
Gas analysis
Gases
Hydrogen
Hydrogen fuels
Hydrogen sulfide
Hydrogen sulphide
Nickel
Oxidation
Poisoning
Recovery
Reforming
Shift reaction
Solid oxide fuel cells
Spectrum analysis
Steam
Sulfur
Sulphides
Sulphur
Working conditions
Yttria-stabilized zirconia
Yttrium
Zirconia
Zirconium dioxide
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Summary:Ni-YSZ (nickel-yttrium-stabilized zirconia) is a common anode for solid oxide fuel cells (SOFCs) because of its excellent catalytic performance and electronic conductivity. It shows that the nickel anode-supported cell exhibits good cell performance in a biogas fuel of 36CH4-36CO2-20H2O-4H2-4CO. Unfortunately, natural biogas fuels often contain sulfur, so using nickel anodes is not always straightforward. This paper investigates the sulfur poisoning and the recovery of BaCe0.7Zr0.1Y0.1Yb0.1O3-δ- (BCZYYb-) (Ce, Y, and Yb codoped barium zirconate) impregnated nickel anode-supported cells operating up to 1.8 W cm-2 in the biogas. The in situ gas analysis reveals that the suppression of the reforming reactions might cause sulfur poisoning in a 4 ppm (v) H2S (hydrogen sulfide) in open circuit conditions, whereas the current degradation in working conditions could be attributed to the deactivation of reforming reactions and catalyst activity. The incidence of water-gas shift reactions is associated with the degradation rate of these two reactions. After removing the H2S, the recovery is accelerated by a steam hydrogen fuel, indicating that steam facilitates the efficient release of sulfur from nickel sites.
ISSN:0363-907X
1099-114X
DOI:10.1155/2023/2339117