TY - JOUR

T1 - New mixed ionic and electronic conductors based on LaScO3

T2 - Protonic ceramic fuel cells electrodes

AU - Plekhanov, M. S.

AU - Kuzmin, A. V.

AU - Tropin, E. S.

AU - Korolev, D. A.

AU - Ananyev, M. V.

N1 - Funding Information: This study is partly supported by the grant of the Russian Science Foundation (Project number no. 16-13-00053 ) and the act 211 of Government of the Russian Federation , agreement no. 02.A03.21.0006 . The work is done using the facilities of the Shared access center “Composition of Compounds” of IHTE UB RAS. Appendix A Publisher Copyright: © 2019 Elsevier B.V. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/2/15

Y1 - 2020/2/15

N2 - In the present work, the well-known proton conducting oxide La0.9Sr0.1ScO3-δ (LSS) is modified by the introduction of transition metal cations into a Sc sublattice in order to enhance the electronic conductivity of the material. Introduced cations of transition metal are selected on the basis of their ion radii and the variety of oxidation state, thus the compositions under study are La0.9Sr0.1Sc1-xMexO3–α (LSSMe) (where Me is Ti, Fe, Co, Ni, or Mo). Introduction of more than 5 mol.% of a dopant leads to a change in conductivity behaviour on pO2 which means that the predominant disorder type shifts from ionic to electronic. Electrochemical performance is studied on both symmetric and fuel cells. Impedance spectra are analysed by means of the distribution of relaxation time (DRT) technique. Both cathodes and anodes have shown great electrochemical performance with polarization resistance at 800 °C as low as 0.005 Ohm*cm2 for the cathode and 0.039 Ohm*cm2 for the anode in wet (water vapour pressure (pH2O) = 2.5*10−2 atm) air and hydrogen respectively.

AB - In the present work, the well-known proton conducting oxide La0.9Sr0.1ScO3-δ (LSS) is modified by the introduction of transition metal cations into a Sc sublattice in order to enhance the electronic conductivity of the material. Introduced cations of transition metal are selected on the basis of their ion radii and the variety of oxidation state, thus the compositions under study are La0.9Sr0.1Sc1-xMexO3–α (LSSMe) (where Me is Ti, Fe, Co, Ni, or Mo). Introduction of more than 5 mol.% of a dopant leads to a change in conductivity behaviour on pO2 which means that the predominant disorder type shifts from ionic to electronic. Electrochemical performance is studied on both symmetric and fuel cells. Impedance spectra are analysed by means of the distribution of relaxation time (DRT) technique. Both cathodes and anodes have shown great electrochemical performance with polarization resistance at 800 °C as low as 0.005 Ohm*cm2 for the cathode and 0.039 Ohm*cm2 for the anode in wet (water vapour pressure (pH2O) = 2.5*10−2 atm) air and hydrogen respectively.

KW - DRT

KW - Electrodes

KW - Impedance spectroscopy

KW - LaScO

KW - Mixed ionic and electronic conductors

KW - PCFC

KW - Protonic-ceramic fuel cell

KW - POLARIZATION RESISTANCE

KW - LaScO3

KW - CATHODE

KW - CONDUCTIVITY

KW - PEROVSKITE

KW - ANODE

KW - ELECTROCHEMICAL PERFORMANCE

UR - http://www.scopus.com/inward/record.url?scp=85075875144&partnerID=8YFLogxK

U2 - 10.1016/j.jpowsour.2019.227476

DO - 10.1016/j.jpowsour.2019.227476

M3 - Article

AN - SCOPUS:85075875144

VL - 449

JO - Journal of Power Sources

JF - Journal of Power Sources

SN - 0378-7753

M1 - 227476

ER -