title: Cathode Based on Molybdenum Disulfide Nanoflakes for Lithium-Oxygen Batteries.
abstract: Lithium-oxygen (Li-O2) batteries have been recognized as an emerging technology for energy storage systems owing to their high theoretical specific energy. One challenge is to find an electrolyte/cathode system that is efficient, stable, and cost-effective. We present such a system based on molybdenum disulfide (MoS2) nanoflakes combined with an ionic liquid (IL) that work together as an effective cocatalyst for discharge and charge in a Li-O2 battery. Cyclic voltammetry results show superior catalytic performance for this cocatalyst for both oxygen reduction and evolution reactions compared to Au and Pt catalysts. It also performs remarkably well in the Li-O2 battery system with 85% round-trip efficiency and reversibility up to 50 cycles. Density functional calculations provide a mechanistic understanding of the MoS2 nanoflakes/IL system. The cocatalyst reported in this work could open the way for exploiting the unique properties of ionic liquids in Li-air batteries in combination with nanostructured MoS2 as a cathode material.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Asadi
authors.forename: Bijandra
authors.initials: B
authors.lastname: Kumar
authors.affiliation: Materials Science Division, Argonne National Laboratory , Argonne, Illinois 60439, United States.
authors.forename: Cong
authors.initials: C
authors.lastname: Liu
authors.forename: Patrick
authors.initials: P
authors.lastname: Phillips
authors.forename: Poya
authors.initials: P
authors.lastname: Yasaei
authors.forename: Amirhossein
authors.initials: A
authors.lastname: Behranginia
authors.affiliation: Materials Science Division, Argonne National Laboratory , Argonne, Illinois 60439, United States.
authors.forename: Peter
authors.initials: P
authors.lastname: Zapol
authors.forename: Robert F
authors.initials: RF
authors.lastname: Klie
authors.affiliation: Materials Science Division, Argonne National Laboratory , Argonne, Illinois 60439, United States.
authors.forename: Larry A
authors.initials: LA
authors.lastname: Curtiss
authors.forename: Amin
authors.initials: A
authors.lastname: Salehi-Khojin
keywords: OER; ORR; catalysts; ionic liquid; lithium−O2 batteries; molybdenum disulfide