Analysis of the regenerative H2S poisoning mechanism in Ce0.8Sm0.2O2-coated Ni/YSZ anodes for intermediate temperature solid oxide fuel cells

Yun, Jeong Woo; Yoon, Sung Pil; Park, Sanggyun; Kim, Hee Su; Nam, Suk Woo

doi:10.1016/j.ijhydene.2010.10.060

Cited by 42 publications

(33 citation statements)

References 32 publications

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“…However, an important reduction of particle size (~0.2 mm) was detected in the sample exposed to H 2 S. This change is probably caused by the formation of sulfide species such as NiS, WS 2 and Ce 2 O 2 S as can be observed by the XRD and XPS results. A reduction of both porosity and pore sizes of the ceria-coated Ni/YSZ after introducing H 2 S was also detected by Yun et al [21].…”

Section: Resultssupporting

confidence: 57%

“…In addition, under reducing operation conditions, CeO 2 is likely to be reduced to CeO 2-x , which is highly reactive with H 2 S to form cerium oxysulfide. These reactions are presented in the following equations [2,21]:…”

Section: Resultsmentioning

confidence: 99%

“…Good fitting between the equivalent circuit and the experimental was observed. This equivalent circuit has been used by other authors to analyze H 2 S poising mechanism [21,26,32] and hydrogen oxidation varying the fuel utilization and gas flow rate in a SOFC cell [27]. In addition, we have also employed this model to study the methane oxidation in cells [25,28].…”

Section: Resultsmentioning

confidence: 99%

“…) could be related to diffusion processes [21,32] and/or bulk processes that might have been caused from the density changes resulting from the formation of NiS, WS 2 , and Ce 2 O 2 S from Ni, W and CeO 2 , after introducing H 2 S, thereby leading to decreased porosity and pores sizes of the anode. Alternatively, it is also possible that the increase of the LF arc could be related to changes in surface property after introduction of H 2 S, for example, surface exchange reactions not including electron transfer or surface diffusion.…”

Section: Resultsmentioning

confidence: 99%

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Electrochemical Analysis of a System Based on W and Ni Combined with CeO₂ as Potential Sulfur‐tolerant SOFC Anode

Escudero

Fuerte

2016

Fuel Cells

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A formulation of tungsten and nickel combined with CeO 2 (WNi-Ce) was prepared and evaluated as sulfur-tolerant anode for SOFC at intermediate temperature. Structural and morphological changes that take place in the system upon interactions with hydrogen sulfide were analyzed. The electrochemical performance was tested in a single cell, WNi-Ce/ LDC/LSGM/LSFC, varying H 2 S concentration (0-500 ppm) at 750°C using I-V curves, impedance spectroscopy and load demands. The highest cell performance was reached in H 2 and decrease with H 2 S content increase in the fuel from 226 mW cm -2 in pure H 2 to 108 mW cm -2 in 500 ppm H 2 S/H 2 .Essentially, no decay in the cell performance was observed in the several short-term load tests studied under several H 2 S concentration (0-500 ppm) during 1h, and even in 500 ppm H 2 S/H 2 during 70 h, indicating that this material could be a potential sulfur-tolerant anode.

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Section: Resultssupporting

confidence: 57%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Electrochemical Analysis of a System Based on W and Ni Combined with CeO₂ as Potential Sulfur‐tolerant SOFC Anode

Escudero

Fuerte

2016

Fuel Cells

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“…In addition, Sm-doped ceria has been reported to act as a sulfur sorbent in an SOFC operated with sulfur containing hydrogen fuel. The authors reported the possible formation of cerium oxysulfide which significantly reduced the sulfur deactivation ability of the Ni/YSZ anode [42]. Although the Pd-CGO containing catalyst did not show any reduction in sulfur deactivation during the steady-state reforming reactions, it is still plausible that CGO retains a considerable amount of sulfur.…”

Section: Post Steady-state Reaction Catalyst Characterizationmentioning

confidence: 99%

Biogas Catalytic Reforming Studies on Nickel‐Based Solid Oxide Fuel Cell Anodes

et al. 2016

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Heterogeneous catalysis studies were conducted on two crushed solid oxide fuel cell (SOFC) anodes in fixed-bed reactors. The baseline anode was Ni/ScYSZ (Ni/scandia and yttria stabilized zirconia), the other was Ni/ScYSZ modified with Pd/doped ceria (Ni/ScYSZ/Pd-CGO). Three main types of experiments were performed to study catalytic activity and effect of sulfur poisoning: (i) CH 4 and CO 2 dissociation; (ii) biogas (60% CH 4 and 40% CO 2 ) temperature-programmed reactions (TPRxn); and (iii) steady-state biogas reforming reactions followed by postmortem catalyst characterization by temperature-programmed oxidation and timeof-flight secondary ion mass spectrometry. Results showed that Ni/ScYSZ/Pd-CGO was more active for catalytic dissociation of CH 4 at 750°C and subsequent reactivity of deposited carbonaceous species. Sulfur deactivated most catalytic reactions except CO 2 dissociation at 750°C. The presence of Pd-CGO helped to mitigate sulfur deactivation effect; e.g. lowering the onset temperature (up to 190°C) for CH 4 conversion during temperature-programmed reactions. Both Ni/ScYSZ and Ni/ScYSZ/Pd-CGO anode catalysts were more active for dry reforming of biogas than they were for steam reforming. Deactivation of reforming activity by sulfur was much more severe under steam reforming conditions than dry reforming; a result of greater sulfur retention on the catalyst surface during steam reforming.

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The effect of H₂S on internal dry reforming in biogas fuelled solid oxide fuel cells

Wasajja

Saadabadi

Illathukandy

et al. 2021

Energy Science & Engineering

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Internal dry reforming of methane is envisaged as a possibility to reduce on capital and operation costs of biogas fuelled solid oxide fuel cells (SOFCs) system by using the CO2 present in the biogas. Due to envisaged internal dry reforming, the requirement for biogas upgrading becomes obsolete, thereby simplifying the system complexity and increasing its technology readiness level. However, impurities prevailing in biogas such as H2S have been reported in literature as one of the parameters which affect the internal reforming process in SOFCs. This research has been carried out to investigate the effects of H2S on internal dry reforming of methane on nickel‐scandia‐stabilised zirconia (Ni‐ScSZ) electrolyte supported SOFCs. Results showed that at 800°C and a CH4:CO2 ratio of 2:3, H2S at concentrations as low as 0.125 ppm affects both the catalytic and electric performance of a SOFC. At 0.125 ppm H2S concentration, the CH4 reforming process is affected and it is reduced from over 95% to below 10% in 10 h. Therefore, future biogas SOFC cost reduction seems to become a trade‐off between biogas upgrading for CO2 removal and biogas cleaning of impurities to facilitate efficient internal dry reforming.

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Analysis of the regenerative H2S poisoning mechanism in Ce0.8Sm0.2O2-coated Ni/YSZ anodes for intermediate temperature solid oxide fuel cells

Cited by 42 publications

References 32 publications

Electrochemical Analysis of a System Based on W and Ni Combined with CeO₂ as Potential Sulfur‐tolerant SOFC Anode

Electrochemical Analysis of a System Based on W and Ni Combined with CeO₂ as Potential Sulfur‐tolerant SOFC Anode

Biogas Catalytic Reforming Studies on Nickel‐Based Solid Oxide Fuel Cell Anodes

The effect of H₂S on internal dry reforming in biogas fuelled solid oxide fuel cells

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Analysis of the regenerative H2S poisoning mechanism in Ce0.8Sm0.2O2-coated Ni/YSZ anodes for intermediate temperature solid oxide fuel cells

Cited by 42 publications

References 32 publications

Electrochemical Analysis of a System Based on W and Ni Combined with CeO2 as Potential Sulfur‐tolerant SOFC Anode

Electrochemical Analysis of a System Based on W and Ni Combined with CeO2 as Potential Sulfur‐tolerant SOFC Anode

Biogas Catalytic Reforming Studies on Nickel‐Based Solid Oxide Fuel Cell Anodes

The effect of H2S on internal dry reforming in biogas fuelled solid oxide fuel cells

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Electrochemical Analysis of a System Based on W and Ni Combined with CeO₂ as Potential Sulfur‐tolerant SOFC Anode

Electrochemical Analysis of a System Based on W and Ni Combined with CeO₂ as Potential Sulfur‐tolerant SOFC Anode

The effect of H₂S on internal dry reforming in biogas fuelled solid oxide fuel cells