期刊
CHEMICAL ENGINEERING JOURNAL
卷 438, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.135446
关键词
Solid oxide fuel cell; Thin-film coating; A-site deficiency; Oxygen reduction reaction; Long-term stability
资金
- National Natural Science Foundation of China [52002121, 52172199, 52072135]
- National Key Research & Development Project [2020YFB1506304]
- Key Program for Intergovernmental S&T Innovation Cooperation Projects of National Key R&D Program of China [2019YFE0107100]
- Overseas Expertise Introduction Center for Discipline Innovation [D18025]
- Analytical and Testing Center of Huazhong University of Science and Technology
To address the stability issue of La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) cathode, researchers propose a novel approach of introducing La(0.9)5CoO(3-delta) (LC95) thin film onto the surface of the porous LSCF scaffold. The hybrid cathode (LSCF@LC95) shows lower polarization resistance and remarkable long-term stability compared to the pristine LSCF cathode.
Challenged by the surface strontium (Sr) enrichment, long-term stability of the La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) cathode remains to be the most intractable problem hindering its further development and application in solid oxide fuel cells (SOFCs). To enhance the durability and performance of LSCF-based electrodes, we propose a novel approach by introducing a highly active A-site deficient La(0.9)5CoO(3-delta) (LC95) thin film onto the surface of the porous LSCF scaffold, simultaneously working as the accepter for Sr diffusion and conformal collector for electrons conduction. Besides the inhibiting effect from the dense coating, the A-site deficiencies reserved in coating lattice enable promising stabilization for Sr diffusion and segregation. At 700 ?, the La0.6Sr0.4Co0.2-Fe0.8O3-delta@La(0.9)5CoO(3-delta) (LSCF@LC95) hybrid cathode shows a polarization resistance of 0.28 omega cm(2), much lower than that for pristine LSCF cathode (0.36 omega cm(2)). In addition to the higher electrochemical activity, single cell with LSCF@LC95 cathode exhibits remarkable long-term stability without detectable degradation over 120 h.
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