期刊
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
卷 16, 期 2, 页码 795-802出版社
SPRINGER
DOI: 10.1007/s10008-011-1431-7
关键词
Electrocatalytic oxidation; Polypyrrole; Gold nanoparticles; Hydroxylamine; Electrodeposition
资金
- Program for New Century Excellent Talents in University [NCET-10-883]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- Shanghai Second Polytechnic University [XQD208014]
- Excellent Young Scholars Research Fund of Shanghai [egd08014]
A highly sensitive hydroxylamine (HA) electrochemical sensor is developed based on electrodeposition of gold nanoparticles with diameter of 8 nm on the presynthesized polypyrrole matrix and formed gold nanoparticles/polypyrrole (GNPs/PPy) composite on glassy carbon electrode. The electrochemical behavior and electrocatalytic activity of the composite-modified electrode are investigated. The GNPs/PPy composite exhibits a distinctly higher electrocatalytic activity for the oxidation of HA than GNPs with twofold enhancement of peak current. The enhanced electrocatalytic activity is attributed to the synergic effect of the highly dispersed gold metal particles and PPy matrix. The overall numbers of electrons involved in HA oxidation, the electron transfer coefficient, catalytic rate constant, and diffusion coefficient are investigated by chronoamperometry. The sensor presents two wide linear ranges of 4.5x10(-7)-1.2x10(-3) M and 1.2x10(-3)-19x10(-3) M with the detection limit of 4.5x10(-8) M (s/n=3). In addition, the proposed electrode shows excellent sensitivity, selectivity, reproducibility, and stability properties.
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