A Highly Efficient Multi-phase Catalyst Dramatically Enhances the Rate of Oxygen Reduction

Yu Chen, YongMan Choi, Seonyoung Yoo, Yong Ding, Ruiqiang Yan, Kai Pei, Chong Qu, Lei Zhang, Ikwhang Chang, Bote Zhao, Yanxiang Zhang, Huijun Chen, Yan Chen, Chenghao Yang, Ben deGlee, Ryan Murphy, Jiang Liu, Meilin Liu

Research output: Contribution to journalArticle

46 Scopus citations

Abstract

Summary This work demonstrates that a multi-phase catalyst coating (∼30 nm thick), composed of BaCoO3−x (BCO) and PrCoO3−x (PCO) nanoparticles (NPs) and a conformal PrBa0.8Ca0.2Co2O5+δ (PBCC) thin film, has dramatically enhanced the rate of oxygen reduction reaction (ORR). When applied to a state-of-the-art La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) cathode in a solid oxide fuel cell (SOFC), the catalyst coating reduced the cathodic polarization resistance from 2.57 to 0.312 Ω cm2 at 600°C. Oxygen molecules adsorb and dissociate rapidly on the NPs due to enriched surface oxygen vacancies and then quickly transport through the PBCC film, as confirmed by density functional theory-based computations. The synergistic combination of the distinctive properties of the two separate phases dramatically enhances the ORR kinetics, which is attractive not only for intermediate-temperature SOFCs but also for other types of energy conversion and storage systems, including electrolysis cells and membrane reactors for synthesis of clean fuels.
Original languageAmerican English
Pages (from-to)938-949
Number of pages12
JournalJoule
Volume2
Issue number5
DOIs
StatePublished - 16 May 2018

Keywords

  • oxygen reduction
  • ORR
  • surface coating
  • solid oxide fuel cell
  • cathode

Fingerprint Dive into the research topics of 'A Highly Efficient Multi-phase Catalyst Dramatically Enhances the Rate of Oxygen Reduction'. Together they form a unique fingerprint.

  • Cite this

    Chen, Y., Choi, Y., Yoo, S., Ding, Y., Yan, R., Pei, K., Qu, C., Zhang, L., Chang, I., Zhao, B., Zhang, Y., Chen, H., Chen, Y., Yang, C., deGlee, B., Murphy, R., Liu, J., & Liu, M. (2018). A Highly Efficient Multi-phase Catalyst Dramatically Enhances the Rate of Oxygen Reduction. Joule, 2(5), 938-949. https://doi.org/10.1016/j.joule.2018.02.008