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), pp. 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)
Keywords: flow battery, lead acid, lead dioxide deposition, methanesulfonic acid, phase composition
Subjects:

Organisations: Engineering Mats & Surface Engineerg Gp
ePrint ID: 66547
Date :
Date Event
24 February 2009Submitted
29 March 2009Published
Date Deposited: 29 Jun 2009
Last Modified: 18 Apr 2017 21:35
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/66547

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