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Highly active and durable double-doped bismuth oxide-based oxygen electrodes for reversible solid oxide cells at reduced temperatures
- Highly active and durable double-doped bismuth oxide-based oxygen electrodes for reversible solid oxide cells at reduced temperatures
- Yun, Byung-Hyun; Kim, Kyeong Joon; Joh, Dong Woo; Chae, Munseok S.; Lee, Jong Jun; Kim, Dae-Won; Kang, Seokbeom; Choi, Doyoung; Hong, Seung-Tae; Lee, Kang Taek
- DGIST Authors
- Hong, Seung-Tae; Lee, Kang Taek
- Issue Date
- Journal of Materials Chemistry A, 7(36), 20558-20566
- Article Type
- HIGH-PERFORMANCE; FUEL-CELLS; ELECTROCHEMICAL PERFORMANCE; REDUCTION REACTION; ELECTROLYSIS CELL; CATHODE; PEROVSKITE; STABILITY; HYDROGEN
- Sluggish reaction kinetics on oxygen electrodes at reduced temperatures (<750 °C) remain a major challenge for the technical progress of reversible solid oxide cells (SOCs). To overcome this issue, the development of highly active and stable oxygen electrodes at intermediate temperatures (ITs, <750 °C) is urgent and essential. Rare earth-stabilized bismuth oxides are known to have high ionic conductivity and fast oxygen surface kinetics. Despite these advantageous properties, unlike conventional zirconia- or ceria-based materials, stabilized bismuth oxides have not been widely investigated as oxygen electrode components for reversible SOC applications. Herein, using the double doping strategy, we successfully developed Dy and Y co-doped Bi2O3 (DYSB), which showed record-high conductivity, ∼110 times higher than that of yttria-stabilized zirconia (YSZ) at ITs. This DYSB combined with conventional La0.8Sr0.2MnO3-δ (LSM) significantly enhanced surface diffusion and incorporation of oxygen ion kinetics during the oxygen reduction reaction (ORR). Finally, the novel LSM-DYSB oxygen electrode was simply embedded in a YSZ electrolyte-based cell without a buffer layer. The LSM-DYSB SOC yielded an extremely high performance of 2.23 W cm-2 in fuel cell mode as well as 1.32 A cm-2 at 1.3 V in electrolysis mode at 700 °C, along with excellent long-term and reversible stabilities. This study demonstrates that the novel DYSB-based electrode has great potential as a high-performance oxygen electrode for next generation SOCs and provides new insight into rational design and material selection for solid state energy conversion and storage applications. © 2019 The Royal Society of Chemistry.
- Royal Society of Chemistry
- Related Researcher
Battery Materials Discovery Laboratory
Magnesium, sodium and lithium ion rechargeable batteries; New inorganic materials discovery; Solid state chemistry; Crystallography; Mg, Na, Li 이온 이차전지; 신 무기재료 합성; 고체화학; 결정화학
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- Department of Energy Science and EngineeringBattery Materials Discovery Laboratory1. Journal Articles
Department of Energy Science and EngineeringAECSL(Advanced Energy Conversion and Storage Lab)1. Journal Articles
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