title: In-situ growth of ultrathin cobalt monoxide nanocrystals on reduced graphene oxide substrates: an efficient electrocatalyst for aprotic Li-O2batteries.
abstract: Large over-potentials during battery operation remain a big obstacle for aprotic Li-O2batteries. Herein, a nanocomposite of about 4 nm cobalt monoxide nanocrystals grown in situ on reduced graphene oxide substrates (CoO/RGO) has been synthesized via a thermal decomposition method. The CoO/RGO cathode delivers a high initial capacity of 14 450 mAh g-1at a current density of 200 mA g-1. Simultaneously it displays little capacity fading after 32 cycles with a capacity restriction of 1000 mAh g-1. Additionally, compared with Ketjenblack and general CoO nanoparticles, ultrathin CoO nanoparticle-decorated RGO electrode materials with a delaminated structure display an observable reduction of over-potential in Li-O2batteries. These results demonstrate that the introduction of RGO improves the performance of CoO, which is a promising strategy for optimizing the design of electrocatalysts for aprotic rechargeable Li-O2batteries.
authors.affiliation: Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, People's Republic of China.
authors.forename: Mengwei
authors.initials: M
authors.lastname: Yuan
authors.forename: Liu
authors.initials: L
authors.lastname: Lin
authors.forename: Yan
authors.initials: Y
authors.lastname: Yang
authors.forename: Caiyun
authors.initials: C
authors.lastname: Nan
authors.forename: Shulan
authors.initials: S
authors.lastname: Ma
authors.forename: Genban
authors.initials: G
authors.lastname: Sun
authors.forename: Huifeng
authors.initials: H
authors.lastname: Li