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• W3196813468 abstract "• A micro-colloidal catalyst of Pd nanoparticles on polyaniline/carbon microspheres was described. • An outstanding synergism was observed toward the catalytic reduction of hydrogen peroxide. • The hydrogen peroxide sensor exhibited good analytical performances. • The electrochemical sensor was applied to detect hydrogen peroxide in human seminal fluid. We describe the chemical synthesis of a colloidal micro-catalyst of palladium nanoparticles decorated on polyaniline-coated carbon microspheres (PdNP-PANi/CMs). The colloidal PdNP-PANi/CMs were used to modify the electrode interface of a highly sensitive non-enzymatic sensor. The morphology and electrochemical properties of the catalyst and electrode were characterized by SEM, EDX, FTIR, XRD, and electrochemical methods. Hydrogen peroxide (H 2 O 2 ) was the model analyte. The catalytic efficiency of the PdNP-PANi/CMs/GCE toward H 2 O 2 was evaluated via the scan rate effect and chronoamperometric measurement, which showed a diffusion-controlled process with a high diffusion coefficient (D = (3.4 ± 0.5) × 10 −3 cm 2 s −1 ) and catalytic rate constant (k cat = (4.50 ± 0.02) × 10 7 mol −1 cm 3 s −1 ). A response time within 5 s and excellent sensitivity (234 µA mM −1 cm −2 ) were obtained. The proposed electrode provided a linear concentration range between 0.002 and 10 mM with a limit of detection of 0.70 µM. Operationally, the PdNP-PANi/CMs/GCE exhibited good electrocatalytic stability and good repeatability, reproducibility, and selectivity. The applicability of the developed sensor was proved by the determination of H 2 O 2 in human seminal fluid. Recoveries were in the range of 97 ± 2% to 102 ± 3%. The good performances of this colloidal micro-catalyst showed the potential of this material in other sensing, biosensing, and biofuel cell applications." @default.
• W3196813468 created "2021-09-13" @default.
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• W3196813468 date "2021-12-01" @default.
• W3196813468 modified "2023-09-26" @default.
• W3196813468 title "Micro-colloidal catalyst of palladium nanoparticles on polyaniline-coated carbon microspheres for a non-enzymatic hydrogen peroxide sensor" @default.
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• W3196813468 doi "https://doi.org/10.1016/j.microc.2021.106785" @default.
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