期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 900, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.163540
关键词
Reversible solid oxide cells; Ag-PrBa0.5Sr0.5CO2O5+delta perovskite nanofibers; Air electrode; Intermediate temperature; Stability
资金
- National Natural Science Foundation of China [22005227]
- Fundamental Research Funds for the Central Universities [2021QN1111]
- Open Project of Key Laboratory of Green Chemical Engineering Process of Ministry of Education [GCP202118]
- Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling [STWR-2021-10]
This study demonstrates the fabrication of novel Pr0.9Ag0.1B0.5Sr0.5Co2O5+delta nanofibers with enhanced electrocatalytic activities for reversible solid oxide cells, improving their performance in low-temperature operation. The cells with the nanofibers air electrode exhibit decreased polarization resistance, increased electrolysis current density, and adequate power density at 700 degrees C, showing exceptional reversibility and stability. The enhancement is attributed to in-situ exsolution of Ag nanoparticles and better interface combination between the air electrode and electrolyte.
Low-temperature operation of reversible solid oxide cells can effectively improve their stable and economical application. However, insufficient catalytic activity of the air electrode is the limiting factor for reversible solid oxide cells. Here, we fabricate a novel Pr0.9Ag0.1B0.5Sr0.5Co2O5+delta nanofibers with enhanced electrocatalytic activities via an electrospinning technique and in-situ exsolution. The study confirms the advantage of morphology engineering in enlarging the catalytic interface and reactive sites, and the cells with Pr0.9Ag0.1B0.5Sr0.5Co2O5+delta nanofibers air electrode exhibit obviously decreased polarization resistance (0.06 Omega cm(2)), increased electrolysis current density of 0.65 A cm(-2) (50 vol% absolute humidity and 1.5 V), and adequate power density (similar to 0.5 W cm(-2)) at 700 degrees C. Also, the cell exhibits exceptional reversibility and stability during the long-term test. The enhancement may be assigned to the in-situ exsolution of Ag nanoparticles at Pr(0.9)Ag(0.1)B(0.5)Sr(0.5)Co(2)O(5+delta )surface and better interface combination between the air electrode and electrolyte. This work provides an exemplificative study on the favorable nanofibers air electrode for high performance intermediate temperature reversible solid oxide cells. (C) 2021 Elsevier B.V. All rights reserved.
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