Evidence of catalyzed oxidation of Li sub(2)O sub(2) for rechargeable Li-air battery applications

The oxidation kinetics of Li sub(2)O sub(2) was studied in a carbonate-free electrolyte using electrodes consisting of non-catalyzed and catalyzed Vulcan carbon (VC) and chemically synthesized Li sub(2)O sub(2) particles. VC and Au nanoparticles supported on VC (Au/C) were fairly inactive for cataly...

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Published inPhysical chemistry chemical physics : PCCP Vol. 14; no. 30; pp. 10540 - 10546
Main Authors Harding, Jonathon R, Lu, Yi-Chun, Tsukada, Yasuhiro, Shao-Horn, Yang
Format Journal Article
LanguageEnglish
Published 01.07.2012
Subjects
Electric potential
Electrodes
Gold
Nanoparticles
Oxidation
Platinum
Reaction kinetics
Voltage
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Summary:The oxidation kinetics of Li sub(2)O sub(2) was studied in a carbonate-free electrolyte using electrodes consisting of non-catalyzed and catalyzed Vulcan carbon (VC) and chemically synthesized Li sub(2)O sub(2) particles. VC and Au nanoparticles supported on VC (Au/C) were fairly inactive for catalyzing the oxidation of Li sub(2)O sub(2), where oxidation currents greater than 10 mA g sub(carbon) super(-1) were found only at voltages equal to and greater than 4.0 V vs.Li (V sub(Li)). Pt and Ru nanoparticles supported on VC (Pt/C and Ru/C) could significantly increase the kinetics of Li sub(2)O sub(2) oxidation, where Li sub(2)O sub(2) could be removed largely at voltages below 4 V sub(Li). In addition, Pt/C and Ru/C showed quick initiation of Li sub(2)O sub(2) oxidation in contrast to VC and Au/C.
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ISSN:1463-9076
1463-9084
DOI:10.1039/c2cp41761h