Electrochemical Synthesis and Application of Nanosized-Palladium Deposited Carbon Nanoparticles

• Main Authors: Yu-Ching Lin, 林佑青
• Other Authors: 曾志明
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/s5pj7t

碩士 === 國立中興大學 === 化學系所 === 99 === This thesis focused on the development of new palladium-carbon nanocomposites and their application in electrochemical sensors. The first part of this study addressed the preparation, morphology and characterization of the palladium-carbon nanocomposites. We used functionalized carbon nanoparticles (CNPs) exfoliated electrochemically from carbon cloth as templates to deposit palladium nanoparticles (Pd NPs) via hydrothermal reduction of the precursor (Pd2+). In order to fully understand the formation mechanism and the best condition for the fabrication of Pd-CNPs (Pd-CN) composites, the influences of Pd concentration and templates on the morphology of the Pd-CN composites were investigated. In addition, the dispersity and size of the Pd-CN composites could be easily controlled by adjusting the synthetic conditions. Transmission electron microscopy (TEM) images show that the Pd NPs are well-dispersed on the surfaces of CNPs. The obtained nanocomposites also accelerated the electron transfer and enhanced the effective surface area, as verified by cyclic voltammetry (CV). The second part of this study aimed at the electrochemical applications of the Pd-CN composites. The Pd-CN composites exhibited excellent electrocatalytic activity towards reduction of both H2O2 and O2 at low overpotentials. Dissolved oxygen (DO) measurement by the activated screen-printed electrode modified with the Pd-CN composites (Pd-CN SPCE*) displayed good linearity with that of a commercial DO meter indicating that the proposed system can be used as a promising O2 sensor. Besides, combination of the Pd-CN SPCE* and flow injection analysis (FIA) was used for the determination of H2O2. The calibration plot was obtained in the range of 20 μM－10 mM with the lowest detection limit of 3.56 μM (S/N = 3). Overall, we demonstrated a simple and rapid manufacturing procedure to effectively produce the Pd-CN composites for use as a sensor with high sensitivity, wide linear range, and good stability, showing excellent analytical performance and practicability.