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Exsolution of Ni nanoparticles on the surface of cerium and nickel co-doped lanthanum strontium titanate as a new anodic layer for DIR-SOFC. Anti-coking potential and H2S poisoning resistance of the prepared material
Abstract
The aim of this study was to evaluate a new catalytic material for biogas fueled DIR-SOFC. This material was a perovskite-type SrTiO3 doped with La, Ce and Ni of a general formula La0.27Sr0.54Ce0.09Ni0.1Ti0.9O3-σ (LSCNT). Additional preparation steps were undertaken to promote a nickel exsolution process. Heat post-treatment of powders in a humidified H2 resulted in an intensive growth of nickel nanoparticles (NPs) while the temperature of reduction was increased gradually from 800 to 1200 oC. Selected reduction temperature equal to 900 oC gave NPs of an average size 22 nm. The prepared material was used as a functional layer deposited onto the anodic site of Ni/YSZ supported SOFC to promote an effective reforming of synthetic and H2S-contaminated biogas at 750 oC. It was found that after 130 h of operation in 60% CH4/40% CO2 mixture, the fuel cell with additional LSCNT layer showed higher power density and no carbon deposits were observed. However, 20 ppm of H2S present in fuel caused a full deactivation of both reference and SOFC with LSCNT layer. Cyclic tests in sour biogas revealed that fabricated anodic layer is much more resistant to sulfur poisoning compared to bare Ni/YSZ anode. Recovery of overall performance after 3 poisoning cycles was nearly 90% for a fuel cell with LSCNT layer, while for unmodified one reached only 75%. Concentrations of exhaust gases such as CH4, CO2 and CO were continuously measured in situ using a FTIR-based technique. The thermochemical analysis revealed that investigated material ensures much better biogas reforming stability over whole testing time and strongly promotes catalytic reactions.
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Authors (5)
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Sea-Fue Wang
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- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.ijhydene.2020.07.162
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- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
no. 45,
pages 29186 - 29200,
ISSN: 0360-3199 - Language:
- English
- Publication year:
- 2020
- Bibliographic description:
- Błaszczak P., Łapiński M., Wang S., Jasiński P., Bochentyn B.: Exsolution of Ni nanoparticles on the surface of cerium and nickel co-doped lanthanum strontium titanate as a new anodic layer for DIR-SOFC. Anti-coking potential and H2S poisoning resistance of the prepared material// INTERNATIONAL JOURNAL OF HYDROGEN ENERGY -Vol. 45,iss. 53 (2020), s.29186-29200
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.ijhydene.2020.07.162
- Verified by:
- Gdańsk University of Technology
Referenced datasets
- dataset The XRD diffraction patterns of LSCNT sintered at various temperatures
- dataset The XPS spectra of LSCNT sintered at 1200C
- dataset Change of exhaust gases concentration for reference SOFC and SOFC with LSCNT layer fueled by biogas mixture at 750 C
- dataset Electrical power measurement of LSCNT modified SOFC fueled by biogas mixture at 750 C
- dataset The SEM images of LSCNT reduced at 900 degrees C under H2
- dataset FTIR spectra of SOFC with LSCNT layer fueled by biogas mixture at 750 C (pure)
- dataset The TEC measurement of LSCNT (dilatometry) in air
- dataset The SEM images of LSCNT sintered at 1200 degrees C in air
- dataset Electrical performance measurement of reference and SOFC with LSCNT layer fueled by H2 and 20ppm H2S/biogas mixture at 750 C - cyclic measurements (12h per cycle)
- dataset The XRD diffraction patterns of reduced LSCNT prepared using two methods and two sintering temperatures
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