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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-HyunKim, Kyeong JoonJoh, Dong WooChae, Munseok S.Lee, Jong JunKim, Dae-WonKang, SeokbeomChoi, DoyoungHong, Seung-TaeLee, Kang Taek
DGIST Authors
Hong, Seung-TaeLee, Kang Taek
Issued Date
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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
  • 홍승태 Hong, Seung-Tae 에너지공학과
  • Research Interests Magnesium; calcium; and zinc ion batteries; lithium all-solid-state batteries; &#29;Inorganic materials discovery; Solid state chemistry; Crystallography; Mg; Ca; Zn 이온 이차전지; 리튬 전고체전지; 신 무기재료 합성; 고체화학; 결정화학
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Department of Energy Science and Engineering AECSL(Advanced Energy Conversion and Storage Lab) 1. Journal Articles
Department of Energy Science and Engineering Battery Materials Discovery Laboratory 1. Journal Articles


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