Palladium Copper Nanosponges for Electrocatalytic Reduction of Oxygen and Glucose Detection
Date Issued
2015
Date
2015
Author(s)
Wu, Wen-Ping
Abstract
A facile and one-pot wet chemical approach has been applied for the preparation of palladium copper (PdCu) nanosponges (NSs) through the reduction of Pd2+ and Cu2+ ions with L-ascorbic acid in the presence of sodium dodecyl sulfate (SDS) at 95 °C. The PdCu NSs prepared in the presence of 12.5, 25, and 37.5 mM SDS have different sizes and catalytic activity for oxygen reduction reaction. Relative to a Pd NPs electrode (0.33 mA cm-2), Cu NPs electrode (0.31 mA cm-2), commercial Pd/C electrode (0.34 mA cm-2) and Pt/C electrode (0.66 mA cm-2), PdCu NS-modified electrodes provide high current density for oxygen reduction reaction (1.93 mA cm-2) under alkaline conditions. The higher catalytic activity of the PdCu NSs is mainly due to their greater electroactive surface area (EASA) and synergistic effect caused by the intimate contact between Pd and Cu. In addition, the PdCu NS-modified electrodes provide high catalytic activity for glucose oxidation at 0.01 V vs. Ag/AgCl and are stable even after sweeping for 43200 s in 0.1 M NaOH containing 0.1 M glucose. The PdCu NS-modified electrodes exhibit high sensitivity (1560 μA mM-1 cm-2), good selectivity, and fast response to glucose over a linear range of 0-30 μM (R2 = 0.997), with a limit of detection (LOD) of 4.1 μM. With the advantages of good stability, excellent electrocatalytic activity, and cost effectiveness, PdCu NSs hold great potential for use in fuel cells using methanol or ethanol as fuel and for the fabrication of electrochemical sensor for the detection of glucose in blood samples.
Subjects
palladium nanomaterials
copper nanomaterials
oxygen reduction reaction
cathode catalyst
enzymeless glucose detection
Type
thesis
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