In:
ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2023-01, No. 54 ( 2023-08-28), p. 357-357
Abstract:
Boosting the lower oxygen reduction reaction (ORR) activity of perovskite cathode material is essential for the development and widespread use of IT-SOFC. Oxygen ion migration at the cathode-electrolyte interface can enhance by introducing structural modifications consisting of high grain boundary density and heterointerfaces [1]. Herein, we fabricated Sr 2 CoNbO 6- δ @Sm 0.2 Ce 0.8 O 1.9 (SCNO@SDC) nanofiber composite using an electrospinning technique and examined the electrochemical impedance for the symmetric cell in air atmosphere. The distinct phases of SCNO and SDC were observed from XRD and FESEM-EDAX analysis. The ionic conductivity was analysed to monitor the electrochemical activity of synthesised material, and the results illustrated that the activation energy for the nanofiber was 0.51 eV lower than conventional composites’ 0.73 eV. The thermal expansion coefficient showed improvement as the value of 14.3 Х 10 -6 K -1 for nanofiber composite than the 17.6 Х 10 -6 K -1 of SCNO-SDC [2]. The symmetric SCNO|SDC|SCNO cell electrodes from nanofiber were fabricated, and electrochemical performance was compared with 20% SDC-SCNO composite in an air atmosphere with varying temperatures from 500 o C to 700 o C. Figure 1. compares polarisation resistance with increased temperature for nanofiber and conventional electrodes. The polarization resistance significantly decreased from 2.76 Ω cm 2 to 0.69 Ω cm 2 for the nanofiber composite than the conventional electrode 5.2 Ω cm 2 to 2.1 Ω cm 2 [3]. The sluggish ORR activity improved due to unique microstructure, high porosity, and specific surface area, which provides extensive triple phase boundaries and a continuous path for charge transfer [4] . Therefore, SCNO@SDC nanofiber composite offers an alternative approach for attaining efficient performance of IT-SOFC. References Choi, Y., Cho, H. J., Kim, J., Kang, J. Y., Seo, J., Kim, J. H., & Jung, W. (2022). Nanofiber Composites as Highly Active and Robust Anodes for Direct-Hydrocarbon Solid Oxide Fuel Cells. ACS nano , 16 (9), 14517-14526. Li, Z., Peng, M., Zhao, Y., Li, J., & Sun, Y. (2021). Minimized thermal expansion mismatch of cobalt-based perovskite air electrodes for solid oxide cells. Nanoscale , 13 (47), 20299-20308. Kumari, N., Tiwari, P. K., Haider, M. A., & Basu, S. (2017). Electrochemical performance of infiltrated Cu-GDC and Cu-PDC cathode for CO2 electrolysis in a solid oxide cell. ECS Transactions , 78 (1), 3329. Zhao, B., Zhang, L., Zhen, D., Yoo, S., Ding, Y., Chen, D., & Liu, M. (2017). A tailored double perovskite nanofiber catalyst enables ultrafast oxygen evolution. Nature communications , 8 (1), 1-9. Figure 1
Type of Medium:
Online Resource
ISSN:
2151-2043
DOI:
10.1149/MA2023-0154357mtgabs
Language:
Unknown
Publisher:
The Electrochemical Society
Publication Date:
2023
detail.hit.zdb_id:
2438749-6
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