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Title: A robust and active hybrid catalyst for facile oxygen reduction in solid oxide fuel cells

Abstract

The sluggish oxygen reduction reaction (ORR) greatly reduces the energy efficiency of solid oxide fuel cells (SOFCs). In this work, we present our results in dramatically enhancing the ORR kinetics and durability of the state-of-the-art La 0.6Sr 0.4Co 0.2Fe 0.8O 3 (LSCF) cathode using a hybrid catalyst coating composed of a conformal PrNi 0.5Mn 0.5O 3 (PNM) thin film with exsoluted PrOx nanoparticles. At 750 °C, the hybrid catalyst-coated LSCF cathode shows a polarization resistance of ~0.022 Ω cm 2, about 1/6 of that for a bare LSCF cathode (~0.134 Ω cm 2). Further, anode-supported cells with the hybrid catalyst-coated LSCF cathode demonstrate remarkable peak power densities (~1.21 W cm –2) while maintaining excellent durability (0.7 V for ~500 h). Near Ambient X-ray Photoelectron Spectroscopy (XPS) and Near Edge X-Ray Absorption Fine Structure (NEXAFS) analyses, together with density functional theory (DFT) calculations, imply that the oxygen-vacancy-rich surfaces of the PrOx nanoparticles greatly accelerate the rate of electron transfer in the ORR whereas the thin PNM film facilitates rapid oxide-ion transport while drastically enhancing the surface stability of the LSCF electrode.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [1];  [1];  [3];  [1]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1];  [4]; ORCiD logo [5];  [4];  [4];  [6]; ORCiD logo [6];  [7];  [7];  [4]; ORCiD logo [1]
  1. Georgia Inst. of Technology, Atlanta, GA (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); South China Univ. of Technology (SCUT), Guangzhou (China)
  3. SABIC Technology Center (Saudi Arabia)
  4. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  5. Materials Science and Engineering; Georgia Institute of Technology; Atlanta; USA
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  7. South China Univ. of Technology (SCUT), Guangzhou (China)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1491027
DOE Contract Number:  
AC02-05CH11231; NT0006557; AR0000502; SC0002633
Resource Type:
Journal Article
Journal Name:
Energy & Environmental Science
Additional Journal Information:
Journal Volume: 10; Journal Issue: 4; Journal ID: ISSN 1754-5692
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English

Citation Formats

Chen, Yu, Chen, Yan, Ding, Dong, Ding, Yong, Choi, YongMan, Zhang, Lei, Yoo, Seonyoung, Chen, Dongchang, deGlee, Ben, Xu, Han, Lu, Qiyang, Zhao, Bote, Vardar, Gulin, Wang, Jiayue, Bluhm, Hendrik, Crumlin, Ethan J., Yang, Chenghao, Liu, Jiang, Yildiz, Bilge, and Liu, Meilin. A robust and active hybrid catalyst for facile oxygen reduction in solid oxide fuel cells. United States: N. p., 2017. Web. doi:10.1039/c6ee03656b.
Chen, Yu, Chen, Yan, Ding, Dong, Ding, Yong, Choi, YongMan, Zhang, Lei, Yoo, Seonyoung, Chen, Dongchang, deGlee, Ben, Xu, Han, Lu, Qiyang, Zhao, Bote, Vardar, Gulin, Wang, Jiayue, Bluhm, Hendrik, Crumlin, Ethan J., Yang, Chenghao, Liu, Jiang, Yildiz, Bilge, & Liu, Meilin. A robust and active hybrid catalyst for facile oxygen reduction in solid oxide fuel cells. United States. doi:10.1039/c6ee03656b.
Chen, Yu, Chen, Yan, Ding, Dong, Ding, Yong, Choi, YongMan, Zhang, Lei, Yoo, Seonyoung, Chen, Dongchang, deGlee, Ben, Xu, Han, Lu, Qiyang, Zhao, Bote, Vardar, Gulin, Wang, Jiayue, Bluhm, Hendrik, Crumlin, Ethan J., Yang, Chenghao, Liu, Jiang, Yildiz, Bilge, and Liu, Meilin. Tue . "A robust and active hybrid catalyst for facile oxygen reduction in solid oxide fuel cells". United States. doi:10.1039/c6ee03656b.
@article{osti_1491027,
title = {A robust and active hybrid catalyst for facile oxygen reduction in solid oxide fuel cells},
author = {Chen, Yu and Chen, Yan and Ding, Dong and Ding, Yong and Choi, YongMan and Zhang, Lei and Yoo, Seonyoung and Chen, Dongchang and deGlee, Ben and Xu, Han and Lu, Qiyang and Zhao, Bote and Vardar, Gulin and Wang, Jiayue and Bluhm, Hendrik and Crumlin, Ethan J. and Yang, Chenghao and Liu, Jiang and Yildiz, Bilge and Liu, Meilin},
abstractNote = {The sluggish oxygen reduction reaction (ORR) greatly reduces the energy efficiency of solid oxide fuel cells (SOFCs). In this work, we present our results in dramatically enhancing the ORR kinetics and durability of the state-of-the-art La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) cathode using a hybrid catalyst coating composed of a conformal PrNi0.5Mn0.5O3 (PNM) thin film with exsoluted PrOx nanoparticles. At 750 °C, the hybrid catalyst-coated LSCF cathode shows a polarization resistance of ~0.022 Ω cm2, about 1/6 of that for a bare LSCF cathode (~0.134 Ω cm2). Further, anode-supported cells with the hybrid catalyst-coated LSCF cathode demonstrate remarkable peak power densities (~1.21 W cm–2) while maintaining excellent durability (0.7 V for ~500 h). Near Ambient X-ray Photoelectron Spectroscopy (XPS) and Near Edge X-Ray Absorption Fine Structure (NEXAFS) analyses, together with density functional theory (DFT) calculations, imply that the oxygen-vacancy-rich surfaces of the PrOx nanoparticles greatly accelerate the rate of electron transfer in the ORR whereas the thin PNM film facilitates rapid oxide-ion transport while drastically enhancing the surface stability of the LSCF electrode.},
doi = {10.1039/c6ee03656b},
journal = {Energy & Environmental Science},
issn = {1754-5692},
number = 4,
volume = 10,
place = {United States},
year = {2017},
month = {3}
}

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