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Title: Enhanced Oxygen Electrocatalysis in Heterostructured Ceria Electrolytes for Intermediate-Temperature Solid Oxide Fuel Cells

Abstract

Heterostructured composite ceria electrolytes have been shown to accelerate the oxygen reduction activity and provide a new approach to improve solid oxide fuel cell (SOFC) performance. In this study, barium carbonate was added to gadolinium-doped ceria, Gd 0.2Ce 0.8O 2–δ (GDC) electrolyte to improve the electrochemical performance of intermediate-temperature SOFCs. The heterostructured electrolyte was formed by the addition of 5 wt % BaCO 3 to a GDC electrolyte, resulting in a reaction during sintering that formed well-dispersed BaCe 0.8Gd 0.2O 3–δ (BCG) throughout the electrolyte. The resulting material was tested as an electrolyte using La 0.6Sr 0.4Co 0.2Fe 0.8O 3–δ as a cathode, resulting in a dramatic reduction to the polarization resistance of more than half the value (600 and 700 °C, the resistance was reduced from 2.49 and 0.23 Ω cm 2 to 1.21 and 0.12 Ω cm 2) obtained by using pure GDC as an electrolyte. Furthermore, full cell SOFC tests employing the heterostructured electrolyte conducted during overextended durations indicated that the BCG phase in the 5BCG–GDC electrolyte was stable in an air atmosphere with no observed reactions with residual CO 2. This approach of tailoring surface reactivity by tailoring the composition and structure of the electrolyte asmore » opposed to electrode materials provides an alternative method to improve fuel cell performance.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]
  1. School of Materials Science and Engineering, Hefei University of Technology, Tunxi Road 193, Hefei 230009, China, Department of Materials Science and Engineering, Clemson University, Clemson, South Carolina 29634, United States
  2. National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
  3. Department of Materials Science and Engineering, Clemson University, Clemson, South Carolina 29634, United States, U.S. Department of Energy, National Energy Technology Laboratory, 3610 Collins Ferry Rd, P.O. Box 880, Morgantown, West Virginia 26507-0880, United States
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Morgantown, WV (United States)
Sponsoring Org.:
USDOE; FE
OSTI Identifier:
1478142
Alternate Identifier(s):
OSTI ID: 1509733
Report Number(s):
NETL-PUB-22340
Journal ID: ISSN 2470-1343
Grant/Contract Number:  
14-6357
Resource Type:
Journal Article: Published Article
Journal Name:
ACS Omega
Additional Journal Information:
Journal Name: ACS Omega Journal Volume: 3 Journal Issue: 10; Journal ID: ISSN 2470-1343
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 25 ENERGY STORAGE

Citation Formats

Hong, Tao, Zhang, Yanxiang, and Brinkman, Kyle. Enhanced Oxygen Electrocatalysis in Heterostructured Ceria Electrolytes for Intermediate-Temperature Solid Oxide Fuel Cells. United States: N. p., 2018. Web. doi:10.1021/acsomega.8b02127.
Hong, Tao, Zhang, Yanxiang, & Brinkman, Kyle. Enhanced Oxygen Electrocatalysis in Heterostructured Ceria Electrolytes for Intermediate-Temperature Solid Oxide Fuel Cells. United States. doi:10.1021/acsomega.8b02127.
Hong, Tao, Zhang, Yanxiang, and Brinkman, Kyle. Thu . "Enhanced Oxygen Electrocatalysis in Heterostructured Ceria Electrolytes for Intermediate-Temperature Solid Oxide Fuel Cells". United States. doi:10.1021/acsomega.8b02127.
@article{osti_1478142,
title = {Enhanced Oxygen Electrocatalysis in Heterostructured Ceria Electrolytes for Intermediate-Temperature Solid Oxide Fuel Cells},
author = {Hong, Tao and Zhang, Yanxiang and Brinkman, Kyle},
abstractNote = {Heterostructured composite ceria electrolytes have been shown to accelerate the oxygen reduction activity and provide a new approach to improve solid oxide fuel cell (SOFC) performance. In this study, barium carbonate was added to gadolinium-doped ceria, Gd0.2Ce0.8O2–δ (GDC) electrolyte to improve the electrochemical performance of intermediate-temperature SOFCs. The heterostructured electrolyte was formed by the addition of 5 wt % BaCO3 to a GDC electrolyte, resulting in a reaction during sintering that formed well-dispersed BaCe0.8Gd0.2O3–δ (BCG) throughout the electrolyte. The resulting material was tested as an electrolyte using La0.6Sr0.4Co0.2Fe0.8O3–δ as a cathode, resulting in a dramatic reduction to the polarization resistance of more than half the value (600 and 700 °C, the resistance was reduced from 2.49 and 0.23 Ω cm2 to 1.21 and 0.12 Ω cm2) obtained by using pure GDC as an electrolyte. Furthermore, full cell SOFC tests employing the heterostructured electrolyte conducted during overextended durations indicated that the BCG phase in the 5BCG–GDC electrolyte was stable in an air atmosphere with no observed reactions with residual CO2. This approach of tailoring surface reactivity by tailoring the composition and structure of the electrolyte as opposed to electrode materials provides an alternative method to improve fuel cell performance.},
doi = {10.1021/acsomega.8b02127},
journal = {ACS Omega},
issn = {2470-1343},
number = 10,
volume = 3,
place = {United States},
year = {2018},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1021/acsomega.8b02127

Citation Metrics:
Cited by: 2 works
Citation information provided by
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