Fluorine-containing oxygen electrodes of the nickelate family for proton-conducting electrochemical cells
authors Tarutin, AP; Vdovin, GK; Medvedev, DA; Yaremchenko, AA
nationality International
journal ELECTROCHIMICA ACTA
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
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.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0013-4686
year published 2020
volume 337
digital object identifier (doi) 10.1016/j.electacta.2020.135808
web of science category Electrochemistry
subject category Electrochemistry
unique article identifier WOS:000521531700038
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journal impact factor 6.215
5 year journal impact factor 5.478
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