title: Fabrication of ternary CNT/PPy/KxMnO2 composite nanowires for electrocatalytic applications.
abstract: CNT/PPy/K(x)MnO(2), a novel ternary core-shell nanowires, was successfully prepared by a two-step self-assembly method and utilized as an electrocatalyst for the oxidation of hydrogen peroxide. The as-synthesized products were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), energy dispersive X-ray (EDX) spectroscopy and Fourier-transform infrared spectra (FTIR) measurements. The results exhibited that the K(x)MnO(2) nanosheets were grown on the surface of CNT/PPy core-shell nanotubes. The planes of the K(x)MnO(2) nanosheets were more or less perpendicular to the CNT/PPy nanotubes. Cyclic voltammetry (CV) results demonstrated that the CNT/PPy/K(x)MnO(2) composite nanowires, as a nonenzyme catalyst, performed well with regards to the oxidation of hydrogen peroxide in 0.1M phosphate buffer solution (pH 7.0). The composite had a fast response with a linear range of 5.0 μM to 9.7 mM and a relatively low detection limit of 2.4 μM (S/N=3). The sensitivity of the sensor for H(2)O(2) was 114.6 μA mM(-1)cm(-2). These excellent properties might be due to the large surface area of the composite nanowires and the quick electron transfer promoted by the combination of CNT and PPy.
authors.affiliation: Alan G. MacDiarmid Institute, Jilin University, Changchun 130012, China.
authors.forename: Tian
authors.initials: T
authors.lastname: Zheng
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Lu
authors.forename: Xiujie
authors.initials: X
authors.lastname: Bian
authors.forename: Chengcheng
authors.initials: C
authors.lastname: Zhang
authors.forename: Yanpeng
authors.initials: Y
authors.lastname: Xue
authors.forename: Xiaoteng
authors.initials: X
authors.lastname: Jia
authors.forename: Ce
authors.initials: C
authors.lastname: Wang
mesh_terms: D002384:Catalysis; D004563:Electrochemistry; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D037742:Nanotubes, Carbon / Q000737:chemistry*; D053770:Nanowires / Q000737:chemistry*; D010084:Oxidation-Reduction; D010545:Peroxides / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D011758:Pyrroles / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D037742:Nanotubes, Carbon; D010545:Peroxides; D011108:Polymers; D011758:Pyrroles; C097259:potassium manganese peroxide; D006861:Hydrogen Peroxide