Highly active and durable double-doped bismuth oxide-based oxygen electrodes for reversible solid oxide cells at reduced temperatures

Byung Hyun Yun, Kyeong Joon Kim, Dong Woo Joh, Munseok S. Chae, Jong Jun Lee, Dae Won Kim, Seokbeom Kang, Doyoung Choi, Seung Tae Hong, Kang Taek Lee

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)20558-20566
Number of pages9
JournalJournal of Materials Chemistry A
Volume7
Issue number36
DOIs
StatePublished - 2019
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2019 The Royal Society of Chemistry.

Funding

This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (20173010032120). This work also has supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT; The Ministry of Science and ICT) (No. 2019M3E6A1066426). This work also was supported by the DGIST Undergraduate Group Research Program (UGRP) grant.

FundersFunder number
DGIST Undergraduate Group Research Program
MSIT
UGRP
Ministry of Trade, Industry and Energy20173010032120
National Research Foundation of Korea
Ministry of Science ICT and Future Planning2019M3E6A1066426
Korea Institute of Energy Technology Evaluation and Planning

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