期刊
TALANTA
卷 81, 期 3, 页码 813-818出版社
ELSEVIER
DOI: 10.1016/j.talanta.2010.01.020
关键词
Pt nanoparticles; PPy; Electrocatalytic; Hydrogen peroxide reduction
资金
- National 973 Project [2007CB936203, S2009061009]
- NSF China [50973038, 50873045]
- National 863 Project [2007AA03Z324]
Pt/polypyrrole (PPy) hybrid hollow microspheres were successfully prepared by wet chemical method via Fe3O4 template and evaluated as electrocatalysts for the reduction of hydrogen peroxide. The as-synthesized products were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS), X-ray diffraction (XRD), inductive coupled plasma emission spectrum (ICP) and Fourier-transform infrared spectra (FTIR) measurements. The results exhibited that ultra-high-density Pt nanoparticles (NPs) were well deposited on the PPy shell with the mean diameters of around 4.1 nm. Cyclic voltammetry (CV) results demonstrated that Pt/PPy hybrid hollow microspheres, as enzyme-less catalysts, exhibited good electrocatalytic activity towards the reduction of hydrogen peroxide in 0.1 M phosphate buffer solution (pH = 7.0). The composite had a fast response of less than 2 s with linear range of 1.0-8.0 mM and a relatively low detection limit of 1.2 mu M (S/N = 3). The sensitivity of the sensor for H2O2 was 80.4 mA M-1 cm(-2). (C) 2010 Elsevier B.V. All rights reserved.
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