|
authors |
Tarutin, AP; Vdovin, GK; Medvedev, DA; Yaremchenko, AA |
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nationality |
International |
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journal |
ELECTROCHIMICA ACTA |
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author keywords |
F-doping; Nd2NiO4; Proton-conducting electrolytes; PCECs & PCFCs; Energy conversion; DRT analysis |
|
keywords |
OXIDE FUEL-CELLS; STRUCTURAL PHASE-TRANSITION; TRANSPORT-PROPERTIES; ELECTRICAL-PROPERTIES; HYDROGEN-PRODUCTION; CHEMICAL-STABILITY; RELAXATION-TIMES; CATHODE MATERIAL; CLEAN ENERGY; PERFORMANCE |
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abstract |
In the present work, the anionic doping of a Ba-containing Nd2NiO4+delta mixed conductor is proposed as an efficient means of tuning its functional properties for application as an oxygen/steam electrode material in protonic ceramic electrolysis cells (PCECs). Single-phase Nd1.9Ba0.1NiO4+delta F gamma(gamma = 0, 0.03, 0.05, 0.07 and 0.1) nickelates having a K2NiF4-type structure were prepared and comprehensively characterised in the range from room temperature to 1000 degrees C. A combination of complimentary techniques, including 4-probe DC electrical measurements, an electron-blocking method, electrochemical impedance spectroscopy and analysis of equivalent circuit schemes and distribution of relaxation times, was employed to reveal the fundamental correlations between electrical properties, oxygen-ionic transport and electrochemical performance of fluorinated nickelates. The highest ionic conductivity in combination with the lowest electrode polarisation resistance was found for the composition with gamma = 0.05. The enhanced transport properties of this material were attributed to mixed anion lattice effect. Electrochemical tests of an electrolysis cell based on a proton-conducting BaCe0.5Zr0.3Y0.1Y0.1O3-delta electrolyte with a Nd1.9Ba0.1NiO4+delta F0.05 oxygen electrode demonstrated competitive performance compared to state-of-the-art PCECs, thus supporting the prospective viability of the proposed approach. (C) 2020 Elsevier Ltd. All rights reserved. |
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publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
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issn |
0013-4686 |
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isbn |
1873-3859 |
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year published |
2020 |
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volume |
337 |
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digital object identifier (doi) |
10.1016/j.electacta.2020.135808 |
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web of science category |
Electrochemistry |
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subject category |
Electrochemistry |
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unique article identifier |
WOS:000521531700038
|
