Peng, Zhangquan and Freunberger, Stefan A. and Hardwick, Laurence J. and Chen, Yuhui and Giordani, Vincent and Barde, Fanny and Novak, Petr and Graham, Duncan and Tarascon, Jean-Marie and Bruce, Peter G. (2011) Oxygen Reactions in a Non-Aqueous Li+ Electrolyte. Agewandte Chemie-International Edition, 50 (28). pp. 6351-6355. ISSN 1433-7851Full text not available in this repository. (Request a copy from the Strathclyde author)
Oxygen (O2) reduction is one of the most studied reactions in chemistry.1 Widely investigated in aqueous media, O2 reduction in non-aqueous solvents, such as CH3CN, has been studied for several decades.2–7 Today, O2 reduction in non-aqueous Li+ electrolytes is receiving considerable attention because it is the reaction on which operation of the Li–air (O2) battery depends.8–29 The Li–O2 battery is generating a great deal of interest because theoretically its high energy density could transform energy storage.8, 9 As a result, it is crucial to understand the O2 reaction mechanisms in non-aqueous Li+ electrolytes. Important progress has been made using electrochemical measurements including recently by Laoire et al.29 No less than five different mechanisms for O2 reduction in Li+ electrolytes have been proposed over the last 40 years based on electrochemical measurements alone.25–29 The value of using spectroelectrochemical methods is that they can identify directly the species involved in the reaction. Here we present in situ spectroscopic data that provide direct evidence that LiO2 is indeed an intermediate on O2 reduction, which then disproportionates to the final product Li2O2. Spectroscopic studies of Li2O2 oxidation demonstrate that LiO2 is not an intermediate on oxidation, that is, oxidation does not follow the reverse pathway to reduction.
|Keywords:||electrochemistry, lithium batteries, oxygen, reduction, surface enhanced Raman spectroscopy, ionic liquids, air batteries, raman-scattering, superoxide ion, electroreduction, dioxygen, TIC - Bionanotechnology, Physical and theoretical chemistry, Electrical engineering. Electronics Nuclear engineering|
|Subjects:||Science > Chemistry > Physical and theoretical chemistry|
Technology > Electrical engineering. Electronics Nuclear engineering
|Department:||Faculty of Engineering > Electronic and Electrical Engineering|
Faculty of Science > Physics
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Faculty of Science > Pure and Applied Chemistry
|Depositing user:||Pure Administrator|
|Date Deposited:||17 Oct 2011 14:10|
|Last modified:||07 Dec 2013 01:56|
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