title: Improving the Performance of Perovskite in Nonaqueous Oxygen Electrocatalysis.
abstract: Nanoparticle (NP) aggregates of lanthanum cobalt oxide perovskite (LCO) were compounded with reduced graphene oxide (rGO) nanosheets and used as the cathode catalyst for nonaqueous lithium-oxygen batteries (LOBs). The LCO NP aggregates were completely surrounded by rGO nanosheets in the composite with 10.5 wt % of rGO (LCO-rGO-10.5) but were partially exposed in the composite with 7.5 wt % of rGO (LCO-rGO-7.5). Both composites performed better than pristine LCO NPs and rGO nanosheets in nonaqueous oxygen electrocatalysis. The LCO-rGO-7.5 composite excelled at capacity and rate performance, while the LCO-rGO-10.5 composite was better at cycle stability. The good performance of the LCO-rGO composites was due to the synergy of functions of LCO and rGO.
authors.affiliation: Department of Chemical and Biomolecular Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, Singapore.
authors.forename: Meihua
authors.initials: M
authors.lastname: Lu
authors.affiliation: College of Aerospace Engineering, Chongqing University, Chongqing, 400044, P.R. China.
authors.forename: Chaohe
authors.initials: C
authors.lastname: Xu
authors.affiliation: Department of Chemical and Biomolecular Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, Singapore.
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhan
authors.affiliation: Department of Chemical and Biomolecular Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, Singapore. cheleejy@nus.edu.sg.
authors.forename: Jim Yang
authors.initials: JY
authors.lastname: Lee
keywords: composites; graphene; lanthanum cobalt oxide; lithium-oxygen batteries; oxygen catalysts