title: Hierarchical Mesoporous/Macroporous Perovskite La0.5Sr0.5CoO3-x Nanotubes: A Bifunctional Catalyst with Enhanced Activity and Cycle Stability for Rechargeable Lithium Oxygen Batteries.
abstract: Perovskites show excellent specific catalytic activity toward both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in alkaline solutions; however, small surface areas of the perovskites synthesized by traditional sol-gel methods lead to low utilization of catalytic sites, which gives rise to poor Li-O2 batteries performance and restricts their application. Herein, a hierarchical mesporous/macroporous perovskite La0.5Sr0.5CoO3-x (HPN-LSC) nanotube is developed to promote its application in Li-O2 batteries. The HPN-LSC nanotubes were synthesized via electrospinning technique followed by postannealing. The as-prepared HPN-LSC catalyst exhibits outstanding intrinsic ORR and OER catalytic activity. The HPN-LSC/KB electrode displays excellent performance toward both discharge and charge processes for Li-O2 batteries, which enhances the reversibility, the round-trip efficiency, and the capacity of resultant batteries. The synergy of high catalytic activity and hierarchical mesoporous/macroporous nanotubular structure results in the Li-O2 batteries with good rate capability and excellent cycle stability of sustaining 50 cycles at a current density of 0.1 mA cm(-2) with an upper-limit capacity of 500 mAh g(-1). The results will benefit for the future development of high-performance Li-O2 batteries using hierarchical mesoporous/macroporous nanostructured perovskite-type catalysts.
authors.affiliation: School of Chemistry and Chemical Engineering, South China University of Technology , Guangzhou 510640, China.
authors.forename: Guoxue
authors.initials: G
authors.lastname: Liu
authors.affiliation: School of Chemistry and Chemical Engineering, South China University of Technology , Guangzhou 510640, China.
authors.forename: Hongbin
authors.initials: H
authors.lastname: Chen
authors.affiliation: School of Chemistry and Chemical Engineering, South China University of Technology , Guangzhou 510640, China.
authors.forename: Lu
authors.initials: L
authors.lastname: Xia
authors.affiliation: School of Chemistry and Chemical Engineering, South China University of Technology , Guangzhou 510640, China.
authors.forename: Suqing
authors.initials: S
authors.lastname: Wang
authors.affiliation: School of Chemistry and Chemical Engineering, South China University of Technology , Guangzhou 510640, China.
authors.forename: Liang-Xin
authors.initials: LX
authors.lastname: Ding
authors.affiliation: School of Chemistry and Chemical Engineering, South China University of Technology , Guangzhou 510640, China.|School of Chemical Engineering, The University of Adelaide , Adelaide, SA 5005, Australia.
authors.forename: Dongdong
authors.initials: D
authors.lastname: Li
authors.affiliation: School of Chemistry and Chemical Engineering, South China University of Technology , Guangzhou 510640, China.
authors.forename: Kang
authors.initials: K
authors.lastname: Xiao
authors.affiliation: School of Chemical Engineering, The University of Adelaide , Adelaide, SA 5005, Australia.
authors.forename: Sheng
authors.initials: S
authors.lastname: Dai
authors.affiliation: School of Chemistry and Chemical Engineering, South China University of Technology , Guangzhou 510640, China.|School of Chemical Engineering, The University of Adelaide , Adelaide, SA 5005, Australia.
authors.forename: Haihui
authors.initials: H
authors.lastname: Wang
keywords: bifunctional catalysts; electrospinning; hierarchical mesoporous/macroporous nanotubes; lithium−oxygen batteries; perovskites