001054009 001__ 1054009
001054009 005__ 20260206202203.0
001054009 037__ $$aFZJ-2026-01663
001054009 041__ $$aEnglish
001054009 1001_ $$0P:(DE-Juel1)204146$$aThankappakurup, Saranya$$b0$$eFirst author$$ufzj
001054009 1112_ $$a19th International Symposium on Solid Oxide Fuel Cells (SOFC-XIX)$$cStockholm$$d2025-07-13 - 2025-07-18$$wSweden
001054009 245__ $$aElectrochemical impedance analysis and degradation behavior of a commercial Ni-YSZ/YSZ/GDC/LSC single cell in direct CO2 electrolysis
001054009 260__ $$c2025
001054009 3367_ $$033$$2EndNote$$aConference Paper
001054009 3367_ $$2DataCite$$aOther
001054009 3367_ $$2BibTeX$$aINPROCEEDINGS
001054009 3367_ $$2DRIVER$$aconferenceObject
001054009 3367_ $$2ORCID$$aLECTURE_SPEECH
001054009 3367_ $$0PUB:(DE-HGF)6$$2PUB:(DE-HGF)$$aConference Presentation$$bconf$$mconf$$s1770383345_17482$$xAfter Call
001054009 520__ $$aThis study investigated the performance and electrochemical behavior of a commercial Ni-YSZ/YSZ/GDC/LSC single cell using AC- and DC- techniques under high temperature CO2 electrolysis conditions. The effects of the operating temperature, CO2 content in the fuel gas, and the oxygen partial pressure on the oxygen electrode side were evaluated. The maximum current density observed was 1.36 A‧cm-2 at 1.5 V and 900 °C. Furthermore, the maximum current densities of -1.2, -0.99, and -0.77 A·cm-2 were observed at 850, 800, and 750 °C, respectively, at 1.5 V under a fuel gas composition of 80% CO2 and 20% CO. The corresponding observed Area Specific Resistance (ASR) values are 0.29, 0.33, 0.38, and 0.49 Ω·cm2 at 900, 850, 800, 800, and 750 °C, respectively. A direct correlation was observed between temperature and ASR values: as the temperature increases, the current density increases, while the ASR values decrease. Furthermore, to analyze the ohmic resistance (RΩ), polarization resistance (Rp), and electrode processes, electrochemical impedance spectroscopy (EIS) was used. The recorded impedance spectrum was analyzed using the Distribution of Relaxation Times (DRT) method and an equivalent circuit model (ECM). The ECM consisting of four-time constants (LR–RC1–RC2–RQ–Ws) gives the best fit of the impedance data compared to other models. The activation energies for RΩ and Rp were calculated from the slopes of the Arrhenius plots. The obtained activation energies were 44 ± 8 kJ mol⁻¹ and 32 ± 3 kJ mol⁻¹ for RΩ and Rp, respectively. The electrode processes were then compared with the literature and found that the low-frequency Warburg short element (Ws) was attributed to gas diffusion at the fuel electrode, while the mid-frequency processes (R₃ and R₄) were associated with the combined contributions of the fuel and oxygen electrodes. Activation energies for the resistances R1, R2, R3, R4 and Ws were calculated using the Arrhenius plot.Finally, the short-term stability tests were conducted at 700, 750, and 800 °C for over 650 hours under a constant current load of -0.5 A‧cm⁻² under 80% CO2 and 20% CO gas composition. The degradation rates of 38, 36, and 34 mV‧kh-1 were found at 700, 750, and 800 °C, respectively. These are lower than the values reported in the literature under CO2 electrolysis conditions
001054009 536__ $$0G:(DE-HGF)POF4-1232$$a1232 - Power-based Fuels and Chemicals (POF4-123)$$cPOF4-123$$fPOF IV$$x0
001054009 7001_ $$0P:(DE-Juel1)169490$$aVibhu, Vaibhav$$b1$$eCorresponding author
001054009 7001_ $$0P:(DE-Juel1)180863$$aWolf, Stephanie$$b2
001054009 7001_ $$0P:(DE-Juel1)207064$$aFrömling, Till$$b3
001054009 7001_ $$0P:(DE-Juel1)156123$$aEichel, Rüdiger-A.$$b4$$ufzj
001054009 909CO $$ooai:juser.fz-juelich.de:1054009$$pVDB
001054009 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)204146$$aForschungszentrum Jülich$$b0$$kFZJ
001054009 9101_ $$0I:(DE-588b)36225-6$$6P:(DE-Juel1)204146$$aRWTH Aachen$$b0$$kRWTH
001054009 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)169490$$aForschungszentrum Jülich$$b1$$kFZJ
001054009 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)207064$$aForschungszentrum Jülich$$b3$$kFZJ
001054009 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)156123$$aForschungszentrum Jülich$$b4$$kFZJ
001054009 9101_ $$0I:(DE-588b)36225-6$$6P:(DE-Juel1)156123$$aRWTH Aachen$$b4$$kRWTH
001054009 9131_ $$0G:(DE-HGF)POF4-123$$1G:(DE-HGF)POF4-120$$2G:(DE-HGF)POF4-100$$3G:(DE-HGF)POF4$$4G:(DE-HGF)POF$$9G:(DE-HGF)POF4-1232$$aDE-HGF$$bForschungsbereich Energie$$lMaterialien und Technologien für die Energiewende (MTET)$$vChemische Energieträger$$x0
001054009 920__ $$lyes
001054009 9201_ $$0I:(DE-Juel1)IET-1-20110218$$kIET-1$$lGrundlagen der Elektrochemie$$x0
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