TY - JOUR

T1 - Transport properties and phase stability of Ni-doped Pr0.6Ba0.4FeO3–δ as potential symmetrical electrodes for proton-conducting electrochemical cells

AU - Gordeeva, M.A.

AU - Starostina, I.A.

AU - Murashkina, A.A.

AU - Vdovin, G.K.

AU - Medvedev, D.A.

N1 - Export Date: 21 October 2024 CODEN: IJHED Адрес для корреспонденции: Medvedev, D.A.; Laboratory of Electrochemical Devices Based on Solid Oxide Proton Electrolytes, Russian Federation; эл. почта: dmitrymedv@mail.ru Адрес для корреспонденции: Gordeeva, M.A.; Laboratory of Electrochemical Devices Based on Solid Oxide Proton Electrolytes, Russian Federation; эл. почта: maryanaberseneva@mail.ru

PY - 2024/11/1

Y1 - 2024/11/1

N2 - BaFeO3-based perovskites have recently attracted considerable attention as a highly promising matrix for the development of robust and electrochemically active electrodes for solid oxide electrochemical cells based on both oxygen-ionic and proton-conducting electrolytes. The excellent redox activity and mixed ionic‒electronic conducting behavior of BaFeO3-based materials support their application not only as oxygen electrodes but also as fuel electrodes. In the present study, Pr0.6Ba0.4FeO3–δ is employed as the initial composition, which is then subjected to various Ni-doping strategies until the formation of stoichiometric (Pr0.6Ba0.4Fe0.9Ni0.1O3–δ) and non-stoichiometric (Pr0.6Ba0.4FeNi0.1O3–δ) compounds. The crystal structure, phase relationships, conductivity, and electrochemical activity of these materials have been comprehensively studied in both oxidizing and reducing atmospheres in an effort to identify the best doped derivatives. The experimental results demonstrate that Ni doping represents a promising approach to increase the electrochemical activity of the origin electrode, as evidenced by the observed improvement in electrical conductivity in oxidizing atmospheres and the formation of electrocatalytically active exsolved particles in reducing atmospheres. At the same time, the stoichiometric composition results in superior electrode performance relative to the non-stoichiometric composition, indicating that conventional co-doping of ABO3 perovskites may prove more advantageous than B-excess (or A-deficient) analogs. Therefore, this work elucidates the intricate composition–structure–property relationships of barium ferrite materials fort their further high-temperature electrochemical applications. © 2024 Hydrogen Energy Publications LLC

AB - BaFeO3-based perovskites have recently attracted considerable attention as a highly promising matrix for the development of robust and electrochemically active electrodes for solid oxide electrochemical cells based on both oxygen-ionic and proton-conducting electrolytes. The excellent redox activity and mixed ionic‒electronic conducting behavior of BaFeO3-based materials support their application not only as oxygen electrodes but also as fuel electrodes. In the present study, Pr0.6Ba0.4FeO3–δ is employed as the initial composition, which is then subjected to various Ni-doping strategies until the formation of stoichiometric (Pr0.6Ba0.4Fe0.9Ni0.1O3–δ) and non-stoichiometric (Pr0.6Ba0.4FeNi0.1O3–δ) compounds. The crystal structure, phase relationships, conductivity, and electrochemical activity of these materials have been comprehensively studied in both oxidizing and reducing atmospheres in an effort to identify the best doped derivatives. The experimental results demonstrate that Ni doping represents a promising approach to increase the electrochemical activity of the origin electrode, as evidenced by the observed improvement in electrical conductivity in oxidizing atmospheres and the formation of electrocatalytically active exsolved particles in reducing atmospheres. At the same time, the stoichiometric composition results in superior electrode performance relative to the non-stoichiometric composition, indicating that conventional co-doping of ABO3 perovskites may prove more advantageous than B-excess (or A-deficient) analogs. Therefore, this work elucidates the intricate composition–structure–property relationships of barium ferrite materials fort their further high-temperature electrochemical applications. © 2024 Hydrogen Energy Publications LLC

KW - Conductivity

KW - Electrochemical activity

KW - Ferrites

KW - PCFCs

KW - Perovskite

KW - Redox stability

KW - SOFC

KW - Symmetrical electrodes

KW - Barium compounds

KW - Electrolytic cells

KW - Praseodymium compounds

KW - Redox reactions

KW - Semiconductor doping

KW - Solid electrolytes

KW - Electrochemical activities

KW - Ni-doped

KW - Ni-doping

KW - Oxidizing atmosphere

KW - Property

KW - Proton conducting

KW - Reducing atmosphere

UR - https://www.mendeley.com/catalogue/6f39132c-7a24-32fd-bcb1-b495b39217b4/

U2 - 10.1016/j.ijhydene.2024.10.115

DO - 10.1016/j.ijhydene.2024.10.115

M3 - статья

VL - 91

SP - 16

EP - 28

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

SN - 0360-3199

ER -