کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
188649 459664 2012 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
PbO2/Pb2+ cycling in methanesulfonic acid and mechanisms associated for soluble lead-acid flow battery applications
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
PbO2/Pb2+ cycling in methanesulfonic acid and mechanisms associated for soluble lead-acid flow battery applications
چکیده انگلیسی

Is this paper, the electrodeposition/electrodissolution cycling of lead dioxide (PbO2) is studied on vitreous carbon electrodes in lead methanesulfonate/methanesulfonic acid medium for a soluble lead acid flow battery application. The influence of the active species concentrations (Pb2+, H+) on the cyclability of lead dioxide (charge efficiency, lifetime of cycling, etc.) is assessed. The proton has a very adverse effect when its concentration is above 1 M. Electrochemical impedance spectroscopy (EIS) shows that the lead dioxide layer can be passivated at the end of reduction when the electrolyte is strongly acidic. Mass changes investigations carried out during PbO2 cycling with a quartz crystal microbalance (QCM) confirm the presence of the solid-state reaction predicted in the literature. This side reaction suggests the formation of a non-stoichiometric PbOx compound with a poor solubility and a high electric resistance. The effect of the acid concentration as well as the current density on the formation of PbOx is assessed. The poor cyclability of PbO2 in high acidic media can be related to the accumulation of this resistive compound within the layer. Finally, considerations for an optimal operation of the battery are presented.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 71, 1 June 2012, Pages 140–149
نویسندگان
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