Journal
ACS CATALYSIS
Volume 11, Issue 6, Pages 3704-3714Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.0c05543
Keywords
one-pot method; oxygen electrode; NBCCF@GDC composite; reversible solid oxide cells; strong coherency
Categories
Funding
- National Key Research & Development Project [2020YFB1506304, 2017YFE0129300]
- National Natural Science Foundation of China [52072135]
- China Scholarship Council [201806160178]
- Analytical and Testing Centre of Huazhong University of Science and Technology
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This study demonstrates a highly efficient oxygen electrode with strong coherency, high stability, and enhanced electrochemical performance. The phase contiguity and interfacial coherence between NBCCF and GDC in the composite material play a key role in improving the performance of the electrode.
The oxygen electrode with a fast oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and sufficient durability plays a pivotal role in reversible solid oxide cells (RSOCs). Here, we demonstrate a NdBa0.5Ca0.5Co1.5Fe0.5O5+delta@Gd0.1Ce0.9O2-delta (NBCCF@GDC) composite oxygen electrode via a one-pot method for exhibiting strong coherency, which result in boosting the electrochemical performance of RSOCs. The NBCCF@GDC electrode yields a very low polarization resistance (0.106 Omega-cm(2) at 800 degrees C), high electrolysis current density (1.45 A cm(-2) with 70 vol % absolute humidity at 1.3 V), and high power density (similar to 1.3 W cm(-2) at 800 degrees C) and shows excellent reversibility and stability. Notably, strong coherency in these NBCCF@GDC composite materials was successfully revealed by HT-XRD, XPS, STEM, and EELS. The phase contiguity and interfacial coherence between NBCCF and GDC increase the Co oxidation state and the number of active sites, which enhanced the electrocatalytic activity for perovskites. Overall, this work demonstrates a highly desirable strategy for the production of functionalized electrodes for next-generation reversible solid oxide cells.
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