| Summary: | 碩士 === 國立高雄應用科技大學 === 化學工程與材料工程系博碩士班 === 104 === 1.Pd@Pt core-shelloctahedrons, nanocubes, and rhombic dodecahedrons as catalysts for glucose oxidation reaction and non-enzymatic glucose sensor
Core-Shell Pd@Pt octahedrons (Pd@PtOct) bounded by (111) planes, core-Shell Pd@Pt nanocubes (NCs) bounded by (100) planes, and core-Shell Pd@Pt rhombic dodecahedrons (Rds) bounded by (110) planes were prepared and used as catalysts for the alkaline D-glucose oxidation reaction (GOR) and non-enzymatic glucose sensor. A systematic study of the specific activities of these three Pd@Pt catalysts in terms of the electrochemical surface area (ESA) has been performed to assess their ability to electrocatalyze the GOR by sequential oxidation reaction and a transient step. For sequential oxidation driven by cyclic voltammetry, the following activity ordering for formation of glucolactone on Pd surfaces was found: Pd@PtOct>Pd@PtNC> Pd@PtRD.Concerning transient catalysis at an applied fixed potential (–0.05 V vs. Ag/AgCl (3 M KCl)), amperometric analyses determined the sensitivities of Pd@PtOct, Pd@PtNC and Pd@PtRD in terms of their ESAs to be 4.32, 3.65, and 3.36 μA mM–1 cm–2, respectively. For the same geometric area of each electrode, the sensitivities of the Pd@PtOct, Pd@PtNC and Pd@PtRDwere found to be 74.71, 53.14, and 44.3 μA mM–1 cm–2, respectively. A comparison by electrochemical analysis suggests that the Pd@PtOct catalysts show better activity, sensitivity, and have a lower limit of detection for D-glucose and are, thus, the most suitable nanoparticle for the D-glucose oxidation reaction.
2.Cu2O rhombic dodecahedrons, octahedrons andnanocubes as catalysts for alkalineglucose oxidation reaction and non-enzymatic glucose sensor
Cu2O octahedrons (Octs) bounded by (111) planes, Cu2O nanocubes (NCs) bounded by (100) planes, and Cu2O rhombic dodecahedrons (Rds) bounded by (110) planes were prepared and used as catalysts for the alkaline D-glucose oxidation reaction (GOR). A systematic study of the specific activities of these three Pd catalysts in terms of the realsurface area (RSA) has been performed to assess their ability to electrocatalyze the GOR by sequential oxidation reaction and a transient step. The RSAs of these three catalysts were determined by Brunauer-Emmett-Teller (BET) adsorption instrument. For sequential oxidation driven by cyclic voltammetry, the following activity ordering for formation of glucolactone on Cu2O surfaces was found: Rd > Oct > NC. In addition,amperometric analyses (0.6 V vs. Ag/AgCl (3 M KCl))determined the sensitivities of NCs, Octs, and Rds, in terms of their RSAs for the normal physiological level of glucose in human blood, to be 36, 37, and 86.02 μA mM–1 cm–2, respectively. A comparison by electrochemical analysis suggests that the Rd catalysts show better activity, sensitivity, and have a lower limit of detection for D-glucose and are, thus, the most suitable nanoparticle for the D-glucose oxidation reaction.
3. Palladium/copper bimetallic alloy catalyst as non-enzymatic dopamine sensor
This study is to report the preparation of irregular Pd/Cu nanocubes (NCs) by adding Cu precursor and Pd precursor in a seed growth method. Through controlling the molar ratioof Pd to Cu precursor of 1:1, irregular Pd0.74Cu0.26 NC (46.45 nm) were prepared. The Pd0.86Cu0.14(46.45 nm) NCs with nanohorns were prepared if the ratio was 1:0.5. The cyclic voltammetric results show the currents for catalytic dopamine on the Pd0.74Cu0.26 NCs and Pd0.86Cu0.14 NCs was 1.36 and 1.32 times higher than Pd NC. The data supported by differential pulse voltammetry analyses shows that the sensitivities for Pd0.74Cu0.26 NCs and Pd0.86Cu0.14 NC were 1.55 μA μM-1 cm-2 under a linear range of 15-300 μM （detection limits: 0.981μM） and 1.07 μA μM-1 cm-2 under a linear range of 15-200μM（detection limit: 1.12 μM）, respectively. A comparison with the linear range (15-100μM) and detection limit (9.97 μM) for the use of Pd NCs shows the two Pd/Cu catalysts have wide analytic range and lower detection limits.
|
|---|
