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This content will become publicly available on April 6, 2019

Title: A highly active hybrid catalyst modified (La 0.60Sr 0.40) 0.95Co 0.20Fe 0.80O 3-δ cathode for proton conducting solid oxide fuel cells

The sluggish reaction kinetics in the cathode usually leads to considerable cathode polarization resistance, hindering the development of proton conducting solid oxide fuel cells (H-SOFCs) operated at intermediate temperatures (400–650 °C). In this paper, to address this problem, for the first time, a novel hybrid catalyst consisting of PrNi 0.5Mn 0.5O 3 and PrOx is impregnated in the (La 0.60Sr 0.40) 0.95Co 0.20Fe 0.80O 3-δ (LSCF) cathode of H-SOFCs, resulting in significant enhancement of the cathode reaction kinetics. Single cells with impregnated LSCF cathode and BaZr 0.8Y 0.2O 3 (BZY) electrolyte yield a maximum power density (MPD) of 0.198 W cm -2 at 600 °C, more than doubled of that with blank LSCF cathode (0.083 W cm -2). ECR and EIS studies reveal that the hybrid catalyst can substantially accelerate the oxygen-ion transfer and oxygen dissociation-absorption processes in the cathode, resulting in significantly lower polarization resistance and higher MPD. In addition, the hybrid catalyst possesses good chemical and microstructural stability at 600 °C. Consequently, the single cells with impregnated LSCF cathode show excellent durability. Finally, this study shows that the impregnation of this novel hybrid catalyst in the cathode could be a promising approach to improve the performance and stabilitymore » of H-SOFCs.« less
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [4] ;  [1]
  1. Univ. of South Carolina, Columbia, SC (United States). Dept. of Mechanical Engineering
  2. Univ. of South Carolina, Columbia, SC (United States). Dept. of Mechanical Engineering; Yancheng Inst. of Technology (China). Jiangsu Collaborative Innovation Center for Ecological Building Materials and Environmental Protection Equipments
  3. Clemson Univ., SC (United States). Dept. of Materials Science and Engineering
  4. Univ. of South Carolina, Columbia, SC (United States). Dept. of Mechanical Engineering; Zhejiang Normal Univ., Jinhua (China). College of Engineering
Publication Date:
Grant/Contract Number:
FE0031176; 21406190; LY15E020006
Type:
Accepted Manuscript
Journal Name:
Journal of Power Sources
Additional Journal Information:
Journal Volume: 389; Journal ID: ISSN 0378-7753
Publisher:
Elsevier
Research Org:
Univ. of South Carolina, Columbia, SC (United States); Yancheng Inst. of Technology (China); Zhejiang Normal Univ., Jinhua (China)
Sponsoring Org:
USDOE Office of Fossil Energy (FE); National Natural Science Foundation of China (NNSFC); Zhejiang Provincial Natural Science Foundation of China
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; solid oxide fuel cells; proton conducting ceramics; LSCF; impregnation
OSTI Identifier:
1432994