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

Abstract

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.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE); USDOE Office of Science (SC)
OSTI Identifier:
1544315
DOE Contract Number:  
FE0026106; FE0031201; AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Joule
Additional Journal Information:
Journal Volume: 2; Journal Issue: 5; Journal ID: ISSN 2542-4351
Publisher:
Elsevier - Cell Press
Country of Publication:
United States
Language:
English

Citation Formats

Chen, Yu, Choi, YongMan, Yoo, Seonyoung, Ding, Yong, Yan, Ruiqiang, Pei, Kai, Qu, Chong, Zhang, Lei, Chang, Ikwhang, Zhao, Bote, Zhang, Yanxiang, Chen, Huijun, Chen, Yan, Yang, Chenghao, deGlee, Ben, Murphy, Ryan, Liu, Jiang, and Liu, Meilin. A Highly Efficient Multi-phase Catalyst Dramatically Enhances the Rate of Oxygen Reduction. United States: N. p., 2018. Web. doi:10.1016/j.joule.2018.02.008.
Chen, Yu, Choi, YongMan, Yoo, Seonyoung, Ding, Yong, Yan, Ruiqiang, Pei, Kai, Qu, Chong, Zhang, Lei, Chang, Ikwhang, Zhao, Bote, Zhang, Yanxiang, Chen, Huijun, Chen, Yan, Yang, Chenghao, deGlee, Ben, Murphy, Ryan, Liu, Jiang, & Liu, Meilin. A Highly Efficient Multi-phase Catalyst Dramatically Enhances the Rate of Oxygen Reduction. United States. doi:10.1016/j.joule.2018.02.008.
Chen, Yu, Choi, YongMan, Yoo, Seonyoung, Ding, Yong, Yan, Ruiqiang, Pei, Kai, Qu, Chong, Zhang, Lei, Chang, Ikwhang, Zhao, Bote, Zhang, Yanxiang, Chen, Huijun, Chen, Yan, Yang, Chenghao, deGlee, Ben, Murphy, Ryan, Liu, Jiang, and Liu, Meilin. Tue . "A Highly Efficient Multi-phase Catalyst Dramatically Enhances the Rate of Oxygen Reduction". United States. doi:10.1016/j.joule.2018.02.008.
@article{osti_1544315,
title = {A Highly Efficient Multi-phase Catalyst Dramatically Enhances the Rate of Oxygen Reduction},
author = {Chen, Yu and Choi, YongMan and Yoo, Seonyoung and Ding, Yong and Yan, Ruiqiang and Pei, Kai and Qu, Chong and Zhang, Lei and Chang, Ikwhang and Zhao, Bote and Zhang, Yanxiang and Chen, Huijun and Chen, Yan and Yang, Chenghao and deGlee, Ben and Murphy, Ryan and Liu, Jiang and Liu, Meilin},
abstractNote = {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.},
doi = {10.1016/j.joule.2018.02.008},
journal = {Joule},
issn = {2542-4351},
number = 5,
volume = 2,
place = {United States},
year = {2018},
month = {5}
}