A novel flow battery: a lead acid battery based on an electrolyte with soluble lead(II): Part VII. Further studies of the lead dioxide positive electrode


Li, Xiaohong, Pletcher, Derek and Walsh, Frank C. (2009) A novel flow battery: a lead acid battery based on an electrolyte with soluble lead(II): Part VII. Further studies of the lead dioxide positive electrode. Electrochimica Acta, 54, (20), 4688-4695. (doi:10.1016/j.electacta.2009.03.075).

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Description/Abstract

Extensive cycling of the soluble lead flow battery has revealed unexpected problems with the reduction
of lead dioxide at the positive electrode during discharge. This has led to a more detailed study of the
PbO2/Pb2+ couple in methanesulfonic acid. The variation of the phase composition (XRD) and deposit
structure (SEM) have been defined as a function of current density, Pb2+ andH+ concentrations, deposition
charge and temperature aswell as the consequences of charge cycling. Pure-PbO2, pure-PbO2 and their
mixtures can be deposited from methanesulfonic acid media. The -phase deposits as a more compact,
smoother layer, which iswell suited to charge cycling. While the anodic deposition of thick layers of PbO2
is straightforward, their reduction is not; the complexities are explained by an increase in pH within the
pores of the deposit. The results suggest that operating the battery at lead(II) concentrations <0.3M and
elevated temperatures should be avoided.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1016/j.electacta.2009.03.075
ISSNs: 0013-4686 (print)
Related URLs:
Keywords: flow battery, lead acid, lead dioxide deposition, methanesulfonic acid, phase composition
Subjects: T Technology > TP Chemical technology
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Q Science > QD Chemistry
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
ePrint ID: 66547
Date Deposited: 29 Jun 2009
Last Modified: 06 Aug 2015 02:53
URI: http://eprints.soton.ac.uk/id/eprint/66547

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