title: Morphology memory but reconstructing crystal structure: porous hexagonal GeO2nanorods for rechargeable lithium-ion batteries.
abstract: Hexagonal GeO2, with high theoretical reversible capacity and low operating voltage, is regarded as a promising anode material for Li ion batteries. Being similar to other alloy type anode materials, the practical application of GeO2is confronted with large volume change and fast capacity fading during lithiation/delithiation cycles. Constructing unique GeO2nanostructures is proposed as an effective strategy to address this issue of fast capacity degradation. However, the controllable synthesis of GeO2nanomaterials is challenged due to the fast hydrolysis of Ge precursors in aqueous solution. In this work, we report a simple strategy to synthesize GeO2nanorods by using orthorhombic Ca2Ge7O16nanorods as the sacrificial template with HNO3as the etching agent. With the morphology memory of orthorhombic Ca2Ge7O16nanorods, the as-prepared porous hexagonal GeO2nanorods exhibit excellent electrochemical performance with a high capacity of 747 mA h g-1after 50 cycles, which should be attributed to the porous and one dimensional nanostructure of GeO2nanorods. This facile 'morphology memory but restructuring crystal structure' method could be extended to the controllable preparation of other GeO2nanostructures, and achieve more efficient anode materials.
authors.affiliation: Henan Key Laboratory of Biomolecular Recognition and Sensing, School of Chemistry and Chemical Engineering, Shangqiu Normal University, Shangqiu 476000, P.R. China. qupeng0212@163.com and School of Chemistry and Environment, Beihang University, Beijing 100191, P.R. China. wanghua8651@buaa.edu.cn guolin@buaa.edu.cn and College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Wei
authors.affiliation: Henan Key Laboratory of Biomolecular Recognition and Sensing, School of Chemistry and Chemical Engineering, Shangqiu Normal University, Shangqiu 476000, P.R. China. qupeng0212@163.com.
authors.forename: Fangfang
authors.initials: F
authors.lastname: Jia
authors.affiliation: Henan Key Laboratory of Biomolecular Recognition and Sensing, School of Chemistry and Chemical Engineering, Shangqiu Normal University, Shangqiu 476000, P.R. China. qupeng0212@163.com.
authors.forename: Peng
authors.initials: P
authors.lastname: Qu
authors.affiliation: School of Chemistry and Environment, Beihang University, Beijing 100191, P.R. China. wanghua8651@buaa.edu.cn guolin@buaa.edu.cn.
authors.forename: Zhongning
authors.initials: Z
authors.lastname: Huang
authors.affiliation: School of Chemistry and Environment, Beihang University, Beijing 100191, P.R. China. wanghua8651@buaa.edu.cn guolin@buaa.edu.cn.
authors.forename: Hua
authors.identifier: http://orcid.org/0000-0002-3444-5062
authors.initials: H
authors.lastname: Wang
authors.affiliation: School of Chemistry and Environment, Beihang University, Beijing 100191, P.R. China. wanghua8651@buaa.edu.cn guolin@buaa.edu.cn.
authors.forename: Lin
authors.initials: L
authors.lastname: Guo