Sintering-driven optimization of multi-ionic SDC-Na2CO3 nanocomposite electrolytes for low-temperature solid oxide cell applications
Composite electrolytes based on samarium-doped ceria (SDC) and sodium carbonate were synthesized via a single-step coprecipitation method and evaluated for low-temperature solid oxide cell (SOC) applications. The impact of sintering temperature on phase composition, microstructure, conductivity, and...
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Elsevier
2025-10-01
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| Series: | Fuel Processing Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0378382025001080 |
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| author | Maria Carmenza Diaz Lacharme Andrea Bartoletti Katia Monzillo Riccardo Ceccato Francesco Parrino Emanuela Callone Sandra Dirè Vincenzo Vaiano Alessandra Sanson Angela Gondolini Alessandro Donazzi |
| author_facet | Maria Carmenza Diaz Lacharme Andrea Bartoletti Katia Monzillo Riccardo Ceccato Francesco Parrino Emanuela Callone Sandra Dirè Vincenzo Vaiano Alessandra Sanson Angela Gondolini Alessandro Donazzi |
| author_sort | Maria Carmenza Diaz Lacharme |
| collection | DOAJ |
| description | Composite electrolytes based on samarium-doped ceria (SDC) and sodium carbonate were synthesized via a single-step coprecipitation method and evaluated for low-temperature solid oxide cell (SOC) applications. The impact of sintering temperature on phase composition, microstructure, conductivity, and stability was systematically studied. X-ray diffraction, scanning electron microscopy, Raman spectroscopy, and solid state nuclear magnetic resonance analyses revealed strong interfacial interactions between SDC and Na2CO3. Electrochemical impedance spectroscopy in air and 4 % H2 atmospheres demonstrated multi-ionic conduction with dominant protonic transport under dry reducing conditions. Conductivity values above 20 mS/cm at 600 °C were achieved in samples sintered at 700 °C, although these exhibited significant decay under 72 h exposure to a humidified atmosphere. Samples sintered at 850 and 900 °C showed improved densification (up to 97 %), allowing proton conduction to follow the same hydration-based transport mechanism observed in conventional perovskite proton conductors, independent of the surrounding gas composition. Open-circuit voltage experiments conducted at 600 °C on highly dense pellets revealed values close to the theoretical Nernst potential, confirming gas tightness and low electronic leakage compared to the pure SDC phase. These findings demonstrate that the SDC-Na2CO3 nanocomposite offers promising transport properties for SOC applications, with trade-offs between conductivity and stability driven by sintering-induced microstructural changes. |
| format | Article |
| id | doaj-art-92d4e5ba7661444984913784e69312ec |
| institution | DOAJ |
| issn | 0378-3820 |
| language | English |
| publishDate | 2025-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Fuel Processing Technology |
| spelling | doaj-art-92d4e5ba7661444984913784e69312ec2025-08-20T03:16:06ZengElsevierFuel Processing Technology0378-38202025-10-0127610828410.1016/j.fuproc.2025.108284Sintering-driven optimization of multi-ionic SDC-Na2CO3 nanocomposite electrolytes for low-temperature solid oxide cell applicationsMaria Carmenza Diaz Lacharme0Andrea Bartoletti1Katia Monzillo2Riccardo Ceccato3Francesco Parrino4Emanuela Callone5Sandra Dirè6Vincenzo Vaiano7Alessandra Sanson8Angela Gondolini9Alessandro Donazzi10Department of Energy, Politecnico di Milano, via Lambruschini 4, 20156 Milan, ItalyNational Research Council of Italy, Institute of Science, Technology and Sustainability for Ceramics (CNR-ISSMC), Via Granarolo 64, 48018 Faenza, ItalyDepartment of Industrial Engineering, University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, ItalyDepartment of Industrial Engineering, University of Trento, via Sommarive 9, 38123 Trento, ItalyDepartment of Industrial Engineering, University of Trento, via Sommarive 9, 38123 Trento, ItalyDepartment of Industrial Engineering, University of Trento, via Sommarive 9, 38123 Trento, ItalyDepartment of Industrial Engineering, University of Trento, via Sommarive 9, 38123 Trento, ItalyDepartment of Industrial Engineering, University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, ItalyNational Research Council of Italy, Institute of Science, Technology and Sustainability for Ceramics (CNR-ISSMC), Via Granarolo 64, 48018 Faenza, ItalyNational Research Council of Italy, Institute of Science, Technology and Sustainability for Ceramics (CNR-ISSMC), Via Granarolo 64, 48018 Faenza, Italy; Corresponding authors.Department of Energy, Politecnico di Milano, via Lambruschini 4, 20156 Milan, Italy; Corresponding authors.Composite electrolytes based on samarium-doped ceria (SDC) and sodium carbonate were synthesized via a single-step coprecipitation method and evaluated for low-temperature solid oxide cell (SOC) applications. The impact of sintering temperature on phase composition, microstructure, conductivity, and stability was systematically studied. X-ray diffraction, scanning electron microscopy, Raman spectroscopy, and solid state nuclear magnetic resonance analyses revealed strong interfacial interactions between SDC and Na2CO3. Electrochemical impedance spectroscopy in air and 4 % H2 atmospheres demonstrated multi-ionic conduction with dominant protonic transport under dry reducing conditions. Conductivity values above 20 mS/cm at 600 °C were achieved in samples sintered at 700 °C, although these exhibited significant decay under 72 h exposure to a humidified atmosphere. Samples sintered at 850 and 900 °C showed improved densification (up to 97 %), allowing proton conduction to follow the same hydration-based transport mechanism observed in conventional perovskite proton conductors, independent of the surrounding gas composition. Open-circuit voltage experiments conducted at 600 °C on highly dense pellets revealed values close to the theoretical Nernst potential, confirming gas tightness and low electronic leakage compared to the pure SDC phase. These findings demonstrate that the SDC-Na2CO3 nanocomposite offers promising transport properties for SOC applications, with trade-offs between conductivity and stability driven by sintering-induced microstructural changes.http://www.sciencedirect.com/science/article/pii/S0378382025001080Composite electrolyteLow-temperature solid oxide cellProton conductionMulti-ionic ConductorElectrochemical characterizationHydrogen |
| spellingShingle | Maria Carmenza Diaz Lacharme Andrea Bartoletti Katia Monzillo Riccardo Ceccato Francesco Parrino Emanuela Callone Sandra Dirè Vincenzo Vaiano Alessandra Sanson Angela Gondolini Alessandro Donazzi Sintering-driven optimization of multi-ionic SDC-Na2CO3 nanocomposite electrolytes for low-temperature solid oxide cell applications Fuel Processing Technology Composite electrolyte Low-temperature solid oxide cell Proton conduction Multi-ionic Conductor Electrochemical characterization Hydrogen |
| title | Sintering-driven optimization of multi-ionic SDC-Na2CO3 nanocomposite electrolytes for low-temperature solid oxide cell applications |
| title_full | Sintering-driven optimization of multi-ionic SDC-Na2CO3 nanocomposite electrolytes for low-temperature solid oxide cell applications |
| title_fullStr | Sintering-driven optimization of multi-ionic SDC-Na2CO3 nanocomposite electrolytes for low-temperature solid oxide cell applications |
| title_full_unstemmed | Sintering-driven optimization of multi-ionic SDC-Na2CO3 nanocomposite electrolytes for low-temperature solid oxide cell applications |
| title_short | Sintering-driven optimization of multi-ionic SDC-Na2CO3 nanocomposite electrolytes for low-temperature solid oxide cell applications |
| title_sort | sintering driven optimization of multi ionic sdc na2co3 nanocomposite electrolytes for low temperature solid oxide cell applications |
| topic | Composite electrolyte Low-temperature solid oxide cell Proton conduction Multi-ionic Conductor Electrochemical characterization Hydrogen |
| url | http://www.sciencedirect.com/science/article/pii/S0378382025001080 |
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