Aqueous-based chemical route toward ambient preparation of multicomponent core-shell nanotubes

• Main Authors: Xu, Zhichuan, Hng, Huey Hoon, Yan, Qingyu, Tan, Hui Teng, Rui, Xianhong, Yu, Hong, Liu, Weiling, Xu, Chen
• Other Authors: School of Materials Science & Engineering
• Format: Article
• Language: English
• Published: 2014
• Subjects: DRNTU::Engineering::Materials::Nanostructured materials
• Online Access: https://hdl.handle.net/10356/103173; http://hdl.handle.net/10220/24422
• Institution: Nanyang Technological University

Room-temperature synthesized V2O5@MnO2 core–shell nanotubes with tunable tunnel dimensions via a facile aqueous-based method are presented. The rational-designed tubular morphology endows them with good permeability of electrolyte ions for maximum utilization of the electroactive sites, while the epitaxial-grown MnO2 imposes mechanical support to V2O5 against structural collapse upon long-term cycling. Hence, specific capacitance as high as 694 F g–1 is achieved at 1 A g–1 accompanied by excellent cycling stability (preserved 92% of its initial specific capacitance after 5000 cycles). In addition, functionalization of the V2O5@MnO2 nanotubes with other transition metal oxides results in ternary composites, V2O5@MnO2/M nanotubes (M = Fe2O3, Co2O3/Co(OH)2, Ni(OH)2). The versatility of this synthetic protocol provides a platform to fabricate complex ternary nanocomposites in a more benign way.