DocumentCode
3201957
Title
Influence of alloying additives (Sb, Sn, Ca, Ag) on the oxygen evolution reaction on Pb/PbO2 electrodes
Author
Monahov, B. ; Pavlov, D. ; Petrov, D.
Author_Institution
Central Lab. of Electrochem. Power Sources, Bulgarian Acad. of Sci., Sofia, Bulgaria
fYear
1999
fDate
1999
Firstpage
275
Lastpage
279
Abstract
When the lead-acid battery is charged over 70% SOC, oxygen is evolved on the positive plates due to water decomposition. In valve-regulated lead-acid batteries, the evolved oxygen forms a closed recombination cycle. The rate of O2 evolution depends on potential, temperature and alloying additives. In this work, the influence of alloying elements (Sb, Sn, Ca, Ag) on oxygen overvoltage is studied and their effect on the activation energy of the process is determined using smooth model electrodes. It is established that Sn increases both the oxygen overvoltage and the activation energy, Ag and Sb have the opposite effect (weaker for Sb). Ca has a small influence on O2 evolution. Besides, the additives increase the ratio α-/β-PbO2 in the corrosion layer
Keywords
electrochemical electrodes; electrochemistry; lead; lead compounds; oxygen; secondary cells; O2; Pb-PbO2; Pb-PbO2 electrodes; Pb-acid secondary batteries; VRLA; activation energy; alloying additives; closed recombination cycle; oxygen evolution reaction; oxygen overvoltage; positive plates; water decomposition; Alloying; Batteries; Electrodes; Laboratories; Lead compounds; Mercury (metals); Oxygen; Temperature dependence; Tin; Voltage control;
fLanguage
English
Publisher
ieee
Conference_Titel
Battery Conference on Applications and Advances, 1999. The Fourteenth Annual
Conference_Location
Long Beach, CA
ISSN
1089-8182
Print_ISBN
0-7803-4967-9
Type
conf
DOI
10.1109/BCAA.1999.796004
Filename
796004
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