title: Charge storage, electrocatalytic and sensing activities of nest-like nanostructured Co3O4.
abstract: We synthesized nanostructured Co3O4samples using anionic (SDS), cationic (CTAB) and nonionic (Triton X-100) surfactant molecules in hydrothermal conditions and subsequent calcination. This approach facilitates the synthesis of porous Co3O4material with bundle-like-sheet, nest-like and flake-like morphologies with specific surface areas in the range of 50-77m2g-1. Among these materials, the nest-like nanostructured Co3O4material has unique pore architecture, larger pore volume, low solution and charge transfer resistance, and found to be an active material for charge storage, electrocatalytic and sensing applications. The specific capacitance value of the nest-like Co3O4is 404Fg-1at a current density of 2Ag-1with 80% specific capacitance retention. The electrocatalytic oxidation of methanol occurs at lower onset potential on this material with good electrochemical stability. It has good sensing ability for glucose with high sensitivity of 929μAcm-2mM-1, fast response time of ∼0.5s and detection limit as low as ∼1μM. These results show that the nest-like nanostructured Co3O4material is a versatile candidate for various applications.
authors.affiliation: Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
authors.forename: G
authors.initials: G
authors.lastname: Rajeshkhanna
authors.affiliation: Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
authors.forename: Ediga
authors.initials: E
authors.lastname: Umeshbabu
authors.affiliation: Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India. Electronic address: grrao@iitm.ac.in.
authors.forename: G
authors.initials: G
authors.lastname: Ranga Rao
keywords: Co(3)O(4); Electrooxidation; Glucose sensor; Supercapacitor