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Study on the Electrocatalysis of Multi-wall Carbon Nanotube and Its Composite Material Modified Electrode

Author: ZhengLi
Tutor: SongJunFeng
School: Northwestern University
Course: Analytical Chemistry
Keywords: Multi-walled carbon nanotubes Curcumin Quercetin Bega due Nickel Room temperature ionic liquids Urapidil Cisapride Hydrazine Methanol Glucose Glycine Voltammetry Chemically modified electrode Electrocatalysis
CLC: O657.1
Type: PhD thesis
Year: 2009
Downloads: 646
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Abstract


Chemically modified electrode is the use of chemical and physical methods, will have excellent chemical properties of molecules, ions, the polymer is fixed on the electrode surface, in order to change or improve the original nature of the electrodes, the functional design of the electrode. Apply new materials such as nanomaterials chemically modified electrode in order to further improve its analytical performance of the current research, it will help broaden the application of electrochemistry and analytical chemistry in the field of life sciences, environmental engineering, energy engineering. This article on the carbon nanotube paste electrode and carbon nanotube composite modified electrode and its impact on some of the drugs, bad environment, energy and life sciences material electric catalysis start work, the text is divided into two parts: Part I: Introduction characteristics of carbon nanotubes and carbon nanotube composite structure of carbon nanotubes and preparation methods, types of modified electrode and its analytical applications were reviewed. Part II: research papers, as follows: 1. Antihypertensive drug urapidil voltammetric behavior of multi-wall carbon nanotubes paste electrode (MWCNT-PE). PH 6.8 Britton-Robinson buffer urapidil generated at the (?) Sensitive oxidation peak at a potential of 0.62V (vs.SCE) The the peak adsorption characteristics of two electrons and two protons irreversible process. Carbon paste electrode (CPE), the peak of the peak potential on the MWCNT-PE reduce peak current increased, indicating that the MWCNT-PE of urapidil oxidation has Electrocatalysis. Produce electricity catalytic. Based on the the anode oxidation behavior of urapidil, differential pulse voltammetry new method for determination of urapidil. Open enrichment 60s, the oxidation peak current of urapidil with its concentration in 5.0 × 10 -8 -2.0 × 10 -6 mol · L -1 within a linear relationship between the detection limit of 3.8 × 10 -8 mol · L -1 urapidil tablets was measured using the method Seoul's content. 2. Gastrointestinal promote dynamic drug cisapride voltammetric behavior and reaction mechanism of multi-walled carbon nanotubes paste electrode was studied by cyclic voltammetry and differential pulse voltammetry. PH 6.09 Britton-Robinson buffer cisapride in the 0.89V (vs.SCE), a sensitive oxidation peak. The oxidation peak is controlled by the adsorption of two electron-proton irreversible process. Its peak current and concentration in of 4.0 × -8 -2.0 × 10 -5 mol · L -1 range linear relationship The detection limit is 1.0 × 10 -8 mol · L -1 . 5 × 10 -6 mol · L -1 cisapride parallel determination of 10 times the relative standard deviation of 3.68%. Measured levels of cisapride tablets method was used, recoveries between 95.7% -104%. 3. Curcumin (CM) power deposition in the multi-walled carbon nanotubes (MWCNT) modified glassy carbon electrode (GCE) surface preparation Curcumin multi-wall carbon nanotubes composite modified glassy carbon electrodes (CM-MWCNT-GCE) . In pH 8.0 phosphate buffer, the modified electrode to render the one pair of two-electron proton oxidation reduction peak. This peak is generated by the electro-oxidation by curcumin curcumin ortho-quinone derivatives quinone / hydroquinone (CM-Q/CM-QH 2 ) redox processes. CM-the GCE MWCNT-GCE, and activation GCE comparison hydrazine CM-MWCNT-GCE on the lower oxidation potential, the oxidation current increases, so that the electrode has good electrical catalysis the oxidation of hydrazine. The the hydrazine chronoamperometry catalytic rate constant k cat 6.26 × 10 3 L · mol -1 · s - 1 . Amperometric hydrazine in pH 8.0 phosphate buffer, the linear range of 2-44 μmol · L -1 , detection limits and sensitivity 1.4μmol · L -1 and 22.9nA L · μmol -1 . The modified electrode preparation is simple, the determination of hydrazine fast response, high sensitivity and good reproducibility. 4. Complex electrical alkaline solution in Ni (II) - quercetin (Qu) deposited on the surface of the carbon nanotube paste electrode prepared Ni (II)-Qu of complexes modified carbon nanotube paste electrode Ni (II )-Qu-MWCNT-PE. Ni (Ⅱ)-MWCNT-PE and Ni (Ⅱ)-Qu-CPE comparison, the electrode surface Ni (III) / Ni (II) electricity on voltammetric response reversibility improve peak current increased and the modified electrode having electrical catalytic activity for methanol and other short chain fatty alcohols, such as ethanol, n-propanol and n-butanol oxidation. Catalytic peak current and the peak potential exponentially with the increase in the number of carbon atoms of fatty alcohol carbon chain decreases. Some kinetic parameters such as electron transfer coefficient α, the electrode reaction rate constant k s and methanol oxidation catalytic rate constant k cat were determined. Ni (Ⅱ)-Qu-MWCNT-PE showed good stability and reproducibility, and can be used for the actual measurement. 5. Complexes of Ni (Ⅱ)-Qu electrical deposition of carbon nanotubes ionic liquids (ILs) paste electrode surface, prepared Ni (Ⅱ)-Qu modified carbon nanotubes ionic liquid paste electrode Ni (II)-Qu of-MWCNT -IL-PE. MWCNT, poly - [Ni (II)-Qu of conductive polymers, the synergistic effect of the ionic liquid on the response of Ni (II)-Qu of-MWCNT-IL-PE on Ni (III) / Ni (II) electric The current increases, the response reversibility improved, and oxidation of glucose so that the modified electrode has good electrocatalytic activity. Of amperometric glucose catalytic oxidation peak current and the concentration of glucose in 5μmol · L -1 -2.8 mmol · L -1 range a linear relationship with a detection limit 1.0μmol · L -1 At the same time, some kinetic parameters such as electron transfer coefficient α, the electrode reaction rate constant k s and glucose oxidation catalytic rate constant k cat determined. The modified electrode preparation is simple, good stability, fast response to the determination of glucose, and high sensitivity. 6. Electric deposition of Ni (Ⅱ) - Bega (BA) in multi-wall carbon nanotubes on the surface of the carbon paste electrode (MWCNT-PE), Ni (Ⅱ)-BA-MWCNT-PE prepared modified electrode. Due to the synergistic effect of the MWCNT, poly - [Ni (Ⅱ)-BA] conductive polymer, Ni (II)-BA-MWCNT-PE Ni (Ⅲ) / Ni (Ⅱ) electricity on the response to the current increase in response to reversible improved, and the modified electrode has good electrocatalytic activity for the oxidation of hydrazine. Amperometric hydrazine catalytic oxidation peak current and the concentration of hydrazine in 2.5μmol L , -1 -0.2 mmol · L -1 range of linear relationship. The detection limit and sensitivity were 0.8μmol · L -1 and 69.9μA · L · mmol (-1). Study the kinetics of the electrode reaction and electrocatalytic reaction process, determination of the electron transfer coefficient α electrode reaction rate constant k s catalytic and catalytic reaction rate constant. Ni (Ⅱ)-BA-MWCNT-PE in alkaline medium. Electrochemical deposition method were prepared nanostructures modified electrode. The modified electrode with electrocatalytic activity of glycine and its catalytic activity than the Ni (II)-MWCNT-PE. The Amperometric measured catalytic peak current and the glycine concentration 20μmol · L -1 -1.0 mmol · L -1 range linear relationship. The detection limit and sensitivity were 9.2μmol · L -1 and 3.92μA L mmol -1 . Determination of glycine, the modified electrode has a simple preparation, fast response, good stability and high sensitivity. Further, some of the kinetic parameters such as the electron transfer coefficient α, the electrode reaction rate constant k s and the catalytic reaction of the catalytic rate constant was also measured.

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