On the Efficacy of Electrocatalysis in Nonaqueous Li–O2 Batteries

TitleOn the Efficacy of Electrocatalysis in Nonaqueous Li–O2 Batteries
Publication TypeJournal Article
Year of Publication2011
AuthorsMcCloskey, Bryan D., Rouven Scheffler, Angela Speidel, Donald S. Bethune, Robert M. Shelby, and Alan C. Luntz
JournalJournal of the American Chemical Society
Volume133
Issue45
Pagination18038 - 18041
Date Published11/2011
ISSN0002-7863
Abstract

Heterogeneous electrocatalysis has become a focal point in rechargeable Li–air battery research to reduce overpotentials in both the oxygen reduction (discharge) and especially oxygen evolution (charge) reactions. In this study, we show that past reports of traditional cathode electrocatalysis in nonaqueous Li–O2 batteries were indeed true, but that gas evolution related to electrolyte solvent decomposition was the dominant process being catalyzed. In dimethoxyethane, where Li2O2 formation is the dominant product of the electrochemistry, no catalytic activity (compared to pure carbon) is observed using the same (Au, Pt, MnO2) nanoparticles. Nevertheless, the onset potential of oxygen evolution is only slightly higher than the open circuit potential of the cell, indicating conventional oxygen evolution electrocatalysis may be unnecessary.

DOI10.1021/ja207229n
Short TitleJ. Am. Chem. Soc.
DOI10.1021/ja207229n