Oxygen Reduction by Lithiated Graphene and Graphene-Based Materials

Kataev, E.Y.; Itkis, D.M.; Fedorov, A.V.; Senkovskiy, B.V.; Usachov, D.Y.; Verbitskiy, N.I.; Alexander, G.; Alxei, B.; Tsukanova, D.Y.; Volykhov, A.A.; Mironovich, K.V.; Krivchenko, V.A.; Rybin, M.G.; Obraztsova, E.D.; Clemens, L.; Vyalikh, D.V.; Yashina, L.V.

Статья опубликована в высокорейтинговом журнале

Информация о цитировании статьи получена из Web of Science, Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 21 мая 2019 г.

Авторы: Kataev Elmar Yu, Itkis Daniil M., Fedorov Alexander V., Senkovskiy Boris V., Usachov Dmitry Yu, Verbitskiy Nikolay I., Alexander Grueneis, Alxei Barinov, Tsukanova Daria Yu, Volykhov Andrey A., Mironovich Kirill V., Krivchenko Victor A., Rybin Maksim G., Obraztsova Elena D., Clemens Laubschat, Vyalikh Denis V., Yashina Lada V.
Журнал: ACS Nano
Том: 9
Год издания: 2015
Издательство: American Chemical Society
Местоположение издательства: United States
Первая страница: 320
Последняя страница: 326
DOI: 10.1021/nn5052103
Аннотация: Oxygen reduction reaction (ORR) plays a key role in the lithium-air batteries (LAB) that attracts great attention thanks to their high theoretical specific energy several times exceeding that of lithium-ion batteries. Due to high surface area, high electric conductivity and low specific gravity various carbons are often materials of choice for applications as the LAB cathode. Unfortunately, the possibility of practical application of such batteries is still under question as the sustainable operation of LABs with carbon cathodes is not demonstrated yet and the cycleability is quite poor that is usually associated with oxygen reduced species side reactions. However, the mechanisms of carbon reactivity towards these species are still unclear. Here we report a direct in situ X-ray photoelectron spectroscopy study of oxygen reduction by lithiated graphene and graphene-based materials. Although lithium peroxide (Li2O2) and lithium oxide (Li2O) reactions with carbon are thermodynamically favorable neither of them was found to react even at elevated temperatures. As lithium superoxide is not stable at room temperature, potassium superoxide (KO2) prepared in situ was used instead to test the reactivity of graphene with superoxide species. In contrast to Li2O2 and Li2O, KO2 was demonstrated to be strongly reactive.
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