authors |
Mikhalev, SM; Juliao, PSB; Loureiro, FJA; Kovalevsky, AV; Shaula, AL; Frade, JR; Fagg, DP |
nationality |
International |
journal |
ELECTROCHIMICA ACTA |
author keywords |
Antimony; Lead; Melt; Impedance spectroscopy; Polarization resistance |
keywords |
FUEL-CELLS; MOLTEN SB; ANODE; PERFORMANCE; STABILITY; SN; BI |
abstract |
Liquid metals have emerged as potential materials for fuel cell and battery applications due to their suit-able redox potentials, fast redox kinetics, and/or active participation in electrode reactions. In this work, we study the electrochemical oxidation behavior of antimony-lead melts by the use of a robust, yttrium-stabilized zirconia based, test setup that can avoid the necessity for the use of precious metals as current collectors. Impedance spectroscopy results obtained at 700 degrees C as a function of applied anodic polarization reveal the presence of two main contributions: an interfacial resistance, occurring at high-frequencies, re-lated to the transference of oxygen-ions between the electrolyte and the anode melt and a low-frequency contribution, related to the diffusion of oxidized species within the bulk of the melt. These electrode mechanisms were followed as a function of the extent of melt oxidation, with suggested links made to the degree of melt segregation supported by SEM and XRD analyses. (c) 2021 Elsevier Ltd. All rights reserved. |
publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
issn |
0013-4686 |
isbn |
1873-3859 |
year published |
2021 |
volume |
395 |
digital object identifier (doi) |
10.1016/j.electacta.2021.139206 |
web of science category |
8 |
subject category |
Electrochemistry |
unique article identifier |
WOS:000697727000002
|