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|標題:||Electrocatalytic reduction and determination of dissolved oxygen at a preanodized screen-printed carbon electrode modified with palladium nanoparticles||作者:||Yang, C.C.
|關鍵字:||palladium nanoparticles;catalysis;oxygen reduction;screen-printed;electrode;4-electron reduction;graphite-electrodes;dioxygen reduction;gold;electrodes;porphyrins;surface;acid;o-2;electroreduction;reactivity||Project:||Electroanalysis||期刊/報告no：:||Electroanalysis, Volume 18, Issue 1, Page(s) 64-69.||摘要:||
Efficient and stable electrocatalytic activity for the reduction Of 02 at activated screen-printed carbon electrodes modified with palladium nanoparticles (SPE*-Pd) was demonstrated in this study. X-ray photoelectron spectroscopy confirmed the formation of > C=O functional group on electrode surface during the preanodization procedure at 2.0 V (vs. Ag/AgCl). The existence of chloride moieties was also identified possibly from the organic binder of carbon ink used in SPE fabrication. Both > C=O and chloride functional groups were essential for the excellent stability of the SPE*-Pd. Electrochemical impedance spectroscopy verified the enhanced kinetic rate of oxygen reduction reaction at the as-prepared Pd nanoparticles. The SPE*-Pd showed ca. 250 mV positive shift in peak potential together with twice increase in peak current compared to those observed at a SPE-Pt. The calibration plot was linear up to 8 ppm of DO with sensitivity and regression coefficient of 4.49 mu A/ppm and 0.9936, respectively. The variation coefficient of i(pc) for 7 DO determinations with O-2-saturated pH 7.4 PBS was 2.1%. Real sample assays for ground and tap waters gave consistent values to those measured by a commercial dissolved oxygen meter.
|Appears in Collections:||化學系所|
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