Preparation and electrochemical properties of La0.5Sr0.5Co0.2Fe0.8O3 oxides as bifunctional catalysts for reversible single-component cells

LIU Fei; YANG Bei-bei; MA Xin-yu; LI Ping; YAN Fei; FU Dong

doi:10.19906/j.cnki.JFCT.2022080

Volume 51 Issue 6

Jun. 2023

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Article Navigation > Journal of Fuel Chemistry and Technology > 2023 > 51(6): 852-862

LIU Fei, YANG Bei-bei, MA Xin-yu, LI Ping, YAN Fei, FU Dong. Preparation and electrochemical properties of La0.5Sr0.5Co0.2Fe0.8O3 oxides as bifunctional catalysts for reversible single-component cells[J]. Journal of Fuel Chemistry and Technology, 2023, 51(6): 852-862. doi: 10.19906/j.cnki.JFCT.2022080

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LIU Fei, YANG Bei-bei, MA Xin-yu, LI Ping, YAN Fei, FU Dong. Preparation and electrochemical properties of La_0.5Sr_0.5Co_0.2Fe_0.8O₃ oxides as bifunctional catalysts for reversible single-component cells[J]. Journal of Fuel Chemistry and Technology, 2023, 51(6): 852-862. doi: 10.19906/j.cnki.JFCT.2022080

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Preparation and electrochemical properties of La_0.5Sr_0.5Co_0.2Fe_0.8O₃ oxides as bifunctional catalysts for reversible single-component cells

doi: 10.19906/j.cnki.JFCT.2022080

LIU Fei^{1, 2
,},
YANG Bei-bei^{1, 2
,},
MA Xin-yu^{1, 2
,},
LI Ping^{1, 2
,},
YAN Fei^{1, 2
,
,},
FU Dong^{1, 2}

1.
North China Electric Power University, Baoding campus, Department of Environmental Science and Engineering, Baoding 071003, China
2.
Hebei Key Laboratory of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China

Funds: The project was supported by the National Natural Science Foundation of China (52102246), Natural Science Foundation of Hebei Province (B2020502002 and B2020502003), and the Fundamental Research Funds for the Central Universities (2020MS124, 2020MS126)

Received Date: 2022-09-09
Accepted Date: 2022-11-03
Rev Recd Date: 2022-11-01

Available Online: 2022-11-08

Publish Date: 2023-06-15

Abstract

Abstract

La_0.5Sr_0.5Co_0.2Fe_0.8O₃ (LSCF) perovskite materials were prepared by hard template method with SBA-15 as the template in methanol and ethanol solvents and the electrochemical properties of LSCF were investigated. It is found that LSCF prepared with ethanol solvent has larger specific surface area and more oxygen vacancy concentration, which in turn exhibits higher electrical conductivity and better catalytic activity towards oxygen reduction reaction (ORR) and hydrogen oxidation reaction (HOR). This is because the LSCF prepared by the ethanol solvent has more Co^{2 +}/Co^{3 +} and Fe^{2 +}/Fe^{3 +} electron pairs, which promotes the electronic conduction of the material. In addition, for HOR, the rate determining step (RDS) is the transfer of adsorbed H to the reaction site, and for ORR, the RDS is the reduction of the adsorbed oxygen atom on LSCF. In addition, the reversible single-component cell (RSCC) composed of LSCF prepared by ethanol solvent shows better performance for discharge and water electrolysis. The maximum power density (P_max) of the RSCC is 232.9 mW/m², and the current density at 1.3 V is −398.3 mA/cm² at 700 ℃.
- perovskite oxides,
- solid oxide fuel cell,
- bifunctional catalysts,
- electrochemical performance

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References(39)

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