Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 52, Pages 57941-57949Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c18583
Keywords
reversible solid oxide cell; high performance; oxygen electrode; stability; co-synthesis
Funding
- National Key Research & Development Project [2020YFB1506304, 2017YFE0129300]
- National Natural Science Foundation of China [52072135, 52002121]
- China Scholarship Council [201806160178]
- Analytical and Testing Centre of Huazhong University of Science and Technology
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Weak electrocatalytic activity of the La0.8Sr0.2MnO3-delta (LSM) oxygen electrode at medium and low temperatures leads to decreasing performance both in the solid oxide fuel cell (SOFC) mode and the solid oxide electrolysis cell (SOEC) mode. Herein, we design an Er0.4Bi1.6O3-delta (ESB) functionalized La0.8Sr0.2MnO3-delta (labeled as LSM/ESB) oxygen electrode via a one-step co-synthesis modified Pechini method. The unique LSM/ESB with polarization resistance of only 0.029 Omega.cm(2) at 750 degrees C enables a highly enhanced rate of oxygen reduction and evolution reaction. The single cell with the LSM/ESB electrode achieves a maximum power density of 1.747 W cm(-2) at 750 degrees C, 2.6 times higher than that of the mechanically mixed LSM-ESB electrode (0.667 W cm(-2)). In the SOEC mode, it also shows the improved performance of the LSM/ESB electrode. Furthermore, the cell exhibits admirable durability of 90 h in the fuel cell mode and excellent reversibility. The better performance can be concluded as a better surface-active state and a tighter connection between the LSM and ESB particles of LSM/ESB via a co-synthesis process. This work proposes a novel strategy to advance the application of the one-step modified Pechini technology for an efficient and stable oxygen electrode.
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