Journal
BIOSENSORS & BIOELECTRONICS
Volume 44, Issue -, Pages 183-190Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2013.01.020
Keywords
Pd; Ni; Ascorbic acid; Electrochemical sensor
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Funding
- New Teachers' Fund for Doctor Stations, Ministry of Education [20126101120012]
- Scientific Research Program
- Shaanxi Provincial Education Department [12JK0578, 12JK0617]
- Science Foundation of Northwest University [NF10005]
- Open Foundation of Key Laboratory of Synthetic and Natural Functional Molecular Chemistry (Ministry of Education) [ZS11034]
- National Natural Scientific Foundation of China [21201092]
- Research Funds for the Central Universities [Lzujbky-2012-65, Lzujbky-2012-203]
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Carbon-supported PdNi nanoparticles (PdNi/C) were synthesized using a novel synthetic route, and characterized by transmission electron microscopy (TEM) and X-ray diffractometry (XRD). The overall metallic content (Pd + Ni) was 10% (w/w) and uniformly distributed in the carbon black (90%) matrix. The electrocatalytic performance of the PdNi/C modified glassy carbon electrode (GCE) was investigated for ascorbic acid (AA) oxidation, and showed better catalytic activity than an equal amount of commercially available palladium carbon catalyst. The oxidation potential of AA was negatively shifted to -0.05 V. The biosensor tolerated a wide linear concentration range for AA, from 1.0 x 10(-5) M to 1.8 x 10(-3) M (R = 0.9973), with a detection limit of 0.5 mu M (S/N = 3). Our results demonstrate that PdNi/C nanomaterials have excellent AA sensing capability, including a fast response time, high reproducibility and stability, with great promise in the quantification of AA in real samples. These qualities make the Pd-based bimetallic catalysts promising candidates for amperometric sensing. (c) 2013 Elsevier B.V. All rights reserved.
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