title: Oxidation-etching preparation of MnO2 tubular nanostructures for high-performance supercapacitors.
abstract: 1D hierarchical tubular MnO(2) nanostructures have been prepared through a facile hydrothermal method using carbon nanofibres (CNFs) as sacrificial template. The morphology of MnO(2) nanostructures can be adjusted by changing the reaction time or annealing process. Polycrystalline MnO(2) nanotubes are formed with a short reaction time (e.g., 10 min) while hierarchical tubular MnO(2) nanostructures composed of assembled nanosheets are obtained at longer reaction times (>45 min). The polycrystalline MnO(2) nanotubes can be further converted to porous nanobelts and sponge-like nanowires by annealing in air. Among all the types of MnO(2) nanostructures prepared, tubular MnO(2) nanostructures composed of assembled nanosheets show optimized charge storage performance when tested as supercapacitor electrodes, for example, delivering an power density of 13.33 kW·kg(-1) and a energy density of 21.1 Wh·kg(-1) with a long cycling life over 3000 cycles, which is mainly related to their features of large specific surface area and optimized charge transfer pathway.
authors.affiliation: School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore.
authors.forename: Jixin
authors.initials: J
authors.lastname: Zhu
authors.forename: Wenhui
authors.initials: W
authors.lastname: Shi
authors.forename: Ni
authors.initials: N
authors.lastname: Xiao
authors.forename: Xianhong
authors.initials: X
authors.lastname: Rui
authors.forename: Huiteng
authors.initials: H
authors.lastname: Tan
authors.forename: Xuehong
authors.initials: X
authors.lastname: Lu
authors.forename: Huey Hoon
authors.initials: HH
authors.lastname: Hng
authors.forename: Jan
authors.initials: J
authors.lastname: Ma
authors.forename: Qingyu
authors.initials: Q
authors.lastname: Yan