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Preparation and cha...
Preparation and characterization of Sm and Ca co-doped ceria-La0.6Sr0.4Co0.2Fe0.8O3-delta semiconductor-ionic composites for electrolyte-layer-free fuel cells
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- Wang, Baoyuan (author)
- KTH,Energiteknik,Hubei University, China,Hubei Univ, Fac Phys & Elect Sci, Hubei Collaborat Innovat Ctr Adv Organ Chem Mat, Wuhan 430062, Hubei, Peoples R China.;Royal Inst Technol, Dept Energy Technol, SE-10044 Stockholm, Sweden.
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- Wang, Yi (author)
- Max Planck Inst Solid State Res MPI FKF, Stuttgart Ctr Electron Microscopy StEM, Heisenbergstr 1, D-70569 Stuttgart, Germany.
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- Fan, Liangdong (author)
- Hubei Univ, Fac Phys & Elect Sci, Hubei Collaborat Innovat Ctr Adv Organ Chem Mat, Wuhan 430062, Hubei, Peoples R China.;Shenzhen Univ, Coll Chem & Environm Engn, Shenzhen 518060, Guangdong, Peoples R China.
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- Cai, Yixiao (author)
- Uppsala universitet,Tillämpad materialvetenskap
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- Xia, Chen (author)
- KTH,Energiteknik,Hubei University, China,Hubei Univ, Fac Phys & Elect Sci, Hubei Collaborat Innovat Ctr Adv Organ Chem Mat, Wuhan 430062, Hubei, Peoples R China.;Royal Inst Technol, Dept Energy Technol, SE-10044 Stockholm, Sweden.
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- Liu, Yanyan (author)
- KTH,Energiteknik,Royal Inst Technol, Dept Energy Technol, SE-10044 Stockholm, Sweden.
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- Raza, Rizwan (author)
- COMSATS Inst Informat Technol, Dept Phys, Islamabad, Pakistan.
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- van Aken, Peter A. (author)
- Max Planck Inst Solid State Res MPI FKF, Stuttgart Ctr Electron Microscopy StEM, Heisenbergstr 1, D-70569 Stuttgart, Germany.
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- Wang, Hao (author)
- Hubei Univ, Fac Phys & Elect Sci, Hubei Collaborat Innovat Ctr Adv Organ Chem Mat, Wuhan 430062, Hubei, Peoples R China.
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- Zhu, Bin (author)
- KTH,Energiteknik,Hubei University, China,Hubei Univ, Fac Phys & Elect Sci, Hubei Collaborat Innovat Ctr Adv Organ Chem Mat, Wuhan 430062, Hubei, Peoples R China.;Royal Inst Technol, Dept Energy Technol, SE-10044 Stockholm, Sweden.
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(creator_code:org_t)
- 2016
- 2016
- English.
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In: Journal of Materials Chemistry A. - : Royal Society of Chemistry. - 2050-7488 .- 2050-7496. ; 4:40, s. 15426-15436
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https://doi.org/10.1...
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Abstract
Subject headings
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- A series of Sm and Ca co-doped ceria, i.e. Ca0.04Ce0.96-xSmxO2-delta (x = 0, 0.09, 0.16, and 0.24) (SCDC), were synthesized by a co-precipitation method. Detailed morphology, composition, crystal structure and electrochemical properties of the prepared materials were characterized. The results revealed that Sm and Ca co-doping could enhance the ionic conductivity in comparison with that of single Ca-doped samples. The composition as Ca0.04Ce0.80Sm0.16O2-delta exhibited a highest ionic conductivity of 0.039 S cm(-1) at 600 degrees C in comparison with the rest of the series, and the optimal ionic conductivity can be interpreted by the coupling effect of oxygen vacancies and mismatch between the dopant ionic radius and critical radius. Composite formation between the semiconductor La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) and the as-prepared SCDC contributed to a remarkable improvement in the ionic conductivity, an unexpectedly high ionic conductivity of 0.188 S cm(-1) was obtained for LSCF-SCDC composites at 600 degrees C, which was four times higher than that of pure SCDC. Using transmission electron microscopy and spectroscopy approaches, we detected an enrichment of oxygen in the LSCF-SCDC interface region and a depletion of oxygen vacancies in LSCF-SCDC and LSCF-LSCF grain boundaries was significantly mitigated, which resulted in the enhancement of ionic conductivity of semiconductor-ionic LSCF-SCDC composites. The electrolyte-layer-free fuel cell (EFFC) fabricated from the LSCF-SCDC semiconductor-ionic membrane demonstrated excellent performances, e.g. 814 mW cm(-2) at 550 degrees C for using the LSCF-Ca0.04Ce0.80Sm0.16O2-delta (SCDC2).
Subject headings
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Keyword
- Calcium
- Crystal structure
- Doping (additives)
- Electrolytes
- Fuel cells
- Grain boundaries
- High resolution transmission electron microscopy
- Ionic conductivity
- Oxygen
- Precipitation (chemical)
- Semiconductor doping
- Semiconductor insulator boundaries
- Transmission electron microscopy
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Wang, Baoyuan
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Wang, Yi
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Fan, Liangdong
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Cai, Yixiao
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Xia, Chen
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Liu, Yanyan
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Raza, Rizwan
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van Aken, Peter ...
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Wang, Hao
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Zhu, Bin
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Materials Chemis ...
- Articles in the publication
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Journal of Mater ...
- By the university
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Royal Institute of Technology
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Uppsala University