title: Enzyme mimics of spinel-type Co(x)Ni(1-x)Fe2O4 magnetic nanomaterial for eletroctrocatalytic oxidation of hydrogen peroxide.
abstract: A series of spinel-type Co(x)Ni(1-x)Fe2O4 (x=0, 0.2, 0.4, 0.5, 0.6, 0.8, 1.0) magnetic nanomaterials were solvothermally synthesized as enzyme mimics for the eletroctrocatalytic oxidation of H2O2. X-ray diffraction and scanning electron microscope were employed to characterize the composition, structure and morphology of the material. The electrochemical properties of spinel-type Co(x)Ni(1-x)Fe2O4 with different (Co/Ni) molar ratio toward H2O2 oxidation were investigated, and the results demonstrated that Co0.5Ni0.5Fe2O4 modified carbon paste electrode (Co0.5Ni0.5Fe2O4/CPE) possessed the best electrocatalytic activity for H2O2 oxidation. Under optimum conditions, the calibration curve for H2O2 determination on Co0.5Ni0.5Fe2O4/CPE was linear in a wide range of 1.0×10(-8)-1.0×10(-3)M with low detection limit of 3.0×10(-9)M (S/N=3). The proposed Co0.5Ni0.5Fe2O4/CPE was also applied to the determination of H2O2 in commercial toothpastes with satisfactory results, indicating that Co(x)Ni(1-x)Fe2O4 is a promising hydrogen peroxidase mimics for the detection of H2O2.
authors.affiliation: College of Sciences, Shanghai University, Shanghai 200444, PR China. luoliqw@yahoo.com.cn
authors.forename: Liqiang
authors.initials: L
authors.lastname: Luo
authors.forename: Yuting
authors.initials: Y
authors.lastname: Zhang
authors.forename: Fang
authors.initials: F
authors.lastname: Li
authors.forename: Xiaojing
authors.initials: X
authors.lastname: Si
authors.forename: Yaping
authors.initials: Y
authors.lastname: Ding
authors.forename: Dongmei
authors.initials: D
authors.lastname: Deng
authors.forename: Tianlin
authors.initials: T
authors.lastname: Wang
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation / Q000379:methods; D002138:Calibration; D003035:Cobalt / Q000737:chemistry; D055664:Electrochemical Techniques / Q000295:instrumentation*; D004566:Electrodes; D005290:Ferric Compounds / Q000737:chemistry; D006861:Hydrogen Peroxide / Q000032:analysis* / Q000737:chemistry*; D057230:Limit of Detection; D008855:Microscopy, Electron, Scanning; D049329:Nanostructures / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry; D010084:Oxidation-Reduction; D009195:Peroxidase / Q000737:chemistry; D014100:Toothpastes / Q000032:analysis; D014961:X-Ray Diffraction
chemical_list: D005290:Ferric Compounds; D014100:Toothpastes; C000499:ferric oxide; D003035:Cobalt; D009532:Nickel; D006861:Hydrogen Peroxide; D009195:Peroxidase
keywords: Co(x)Ni(1−x)Fe(2)O(4); Enzyme mimics; H(2)O(2); Spinel-type