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In situ XRD investigation of the evolution of surface layers on Pb-alloy anodes

conference contribution
posted on 2023-08-29, 06:28 authored by Marie Clancy, Mark J Styles, Colleen J Bettles, Nick Birbilis, Justin A Kimpton, Nathan AS Webster
The electrochemical behaviour of a number of Pb-based anode alloys, under simulated electrowinning conditions, in a 1.6 M H2SO4 electrolyte at 45 °C was studied. Namely, the evolution of PbO2 and PbSO4 surface layers was investigated by quantitative in situ synchrotron X-ray diffraction (S-XRD) and subsequent Rietveld-based quantitative phase analysis (QPA). In the context of seeking new anode alloys, this research shows that the industry standard Pb-0.08Ca-1.52Sn (wt%) anode, when exposed to a galvanostatic current and intermittent power interruptions, exhibited poor electrochemical performance relative to select custom Pb-based binary alloys; Pb–0.73Mg, Pb–5.05Ag, Pb–0.07Rh, and Pb–1.4Zn (wt%). The in situ S-XRD measurements and subsequent QPA indicated that this was linked to a lower proportion of β-PbO2, relative to PbSO4, on the Pb-0.08Ca-1.52Sn alloy at all stages of the electrochemical cycling. The best performing alloy, in terms of minimisation of overpotential during normal electrowinning operation and minimising the deleterious effects of repeated power interruptions – both of which are significant factors in energy consumption – was determined to be Pb–0.07Rh.

History

Volume

32

Pagination

S54-S60

Location

AUSTRALIA, Melbourne

Start date

2017-02-05

End date

2017-02-09

ISSN

0885-7156

eISSN

1945-7413

Language

English

Title of proceedings

POWDER DIFFRACTION

Event

Australian-X-Ray-Analytical-Association Workshops (AXAA)

Issue

S2

Publisher

CAMBRIDGE UNIV PRESS

Place of publication

Cambridge, Eng.

Series

Powder Diffraction