Electrochemical saturation of antimony-lead melts with oxygen: Cell design and measurement

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