title: Layer by layer assembly of ultrathin V₂O₅ anchored MWCNTs and graphene on textile fabrics for fabrication of high energy density flexible supercapacitor electrodes.
abstract: Among transition metal oxides, vanadium oxides have received relatively modest attention for supercapacitor applications. Yet, this material is abundant, relatively inexpensive and offer several oxidation states which can provide a broad range of redox reactions suitable for supercapacitor operation. Electrochemical supercapacitors based on nanostructured vanadium oxide (V₂O₅) suffer from relatively low energy densities as they have low surface area and poor electrical conductivities. To overcome these problems, we developed a layer by layer assembly (LBL) technique in which a graphene layer was alternatively inserted between MWCNT films coated with ultrathin (3 nm) V₂O₅. The insertion of a conductive spacer of graphene between the MWCNT films coated with V₂O₅ not only prevents agglomeration between the MWCNT films but also substantially enhances the specific capacitance by 67%, to as high as ∼2590 F g(-1). Furthermore, the LBL assembled multilayer supercapacitor electrodes exhibited an excellent cycling performance of >97%, capacitance retention over 5000 cycles and a high energy density of 96 W h kg(-1) at a power density of 800 W kg(-1). Our approach clearly offers an exciting opportunity for enhancing the device performance of metal oxide-based electrochemical supercapacitors suitable for next-generation flexible energy storage devices by employing a facile LBL assembly technique.
authors.affiliation: Department of Physics, Institute of Basic Sciences, Sungkyunkwan University, Suwon 440-746, Republic of Korea. djkang@skku.edu.
authors.forename: Imran
authors.initials: I
authors.lastname: Shakir
authors.forename: Zahid
authors.initials: Z
authors.lastname: Ali
authors.forename: Jihyun
authors.initials: J
authors.lastname: Bae
authors.forename: Jongjin
authors.initials: J
authors.lastname: Park
authors.forename: Dae Joon
authors.initials: DJ
authors.lastname: Kang
mesh_terms: D025802:Electric Capacitance; D004566:Electrodes; D006108:Graphite / Q000737:chemistry*; D008567:Membranes, Artificial; D013784:Textiles; D017968:Vanadium Compounds / Q000737:chemistry*
chemical_list: D008567:Membranes, Artificial; D017968:Vanadium Compounds; D006108:Graphite