Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 927, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.167033
Keywords
First principles; LSCF cathode; Oxygen reduction reaction; PSCF modification; Solid oxide fuel cell
Categories
Funding
- Open Foundation of Guangxi Key laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University [2021GXYSOF01]
- Scientific and Technological Project in Henan Province [222102320091]
- 111 Project [B17034]
- Key Lab of Colloid and Interface Chemistry, at Shandong University
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This study investigates the effects of perovskite-structured Pr0.4Sr0.6Co0.2Fe0.8O3-delta (PSCF) modification on the electrochemical performance of La1-xSrxCo1-yFeyO3-delta (LSCF) cathodes using experimental and theoretical methods. The results show that PSCF modification reduces the formation energies of oxygen vacancies, lowers the adsorption energies of oxygen adsorption on the LSCF surface, and greatly decreases the dissociation barriers of oxygen molecules on the LSCF surface. These changes result in a significant improvement in the rate of oxygen reduction reaction and the activation of the LSCF surface with PSCF modification, leading to enhanced performance of the cathode.
Surface modification is an effective approach for the improvement of the electrochemical performance of cathodes. Here effects of perovskite-structured Pr0.4Sr0.6Co0.2Fe0.8O3-delta (PSCF) modification are investigated on the electrochemical performance of La1-xSrxCo1-yFeyO3-delta (LSCF) cathodes with experimental and theoretical methods. The formation energies of oxygen vacancy are reduced with PSCF modification and the adsorption energies of oxygen adsorption on PSCF modified LSCF surface are lower than those on the LSCF surface. Also the dissociation barriers of oxygen molecules on the LSCF surface are greatly decreased, indicating that the rate of oxygen reduction reaction is greatly improved and the LSCF surface is activated with PSCF modification. Results of electrochemical impedance spectra tests show that polarization resistance (R-p) of LSCF cathodes decreases with the appropriate amount of PSCF impregnation and reaches the lowest R-p (0.055 omega cm(2)) with about 10 wt% impregnation at 750 ?. Results of electrical conductivity relaxation indicate that the performance improvement of LSCF cathodes mainly results from the increase of oxygen surface exchange property (5.4 x10(-4) and 1.1 x10(-3 )cm s(-1)), which is consistent with the calculation results. (c) 2022 Elsevier B.V. All rights reserved.
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