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Electrochemical Properties of Graphene Modified Electrode

Author: YangShunLong
Tutor: YeJianShan
School: South China University of Technology
Course: Applied Chemistry
Keywords: Graphene Electrochemical Polyaniline Electrode size Self - assembly of membrane electrode
CLC: O646.5
Type: Master's thesis
Year: 2010
Downloads: 1360
Quote: 1
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Abstract


Graphene (Graphene) closely packed monolayer two-dimensional honeycomb lattice structure of a new carbonaceous material is a carbon atom, is to build a zero-dimensional fullerene, a one-dimensional carbon nanotube, three-dimensional graphite and other carbonaceous material basic unit, with many excellent and unique physical, chemical and mechanical properties, has a wide range of applications in micro-nano electronic devices, optoelectronic devices, new composite materials and sensing materials, graphene-based research become electric hot research field, one of the chemical field. The paper around the graphene modified electrode conditions, combined with electrochemical basic research, to carry out the electrochemical properties of graphene and its related research. The specific contents are summarized as follows: (1) the graphene with good conductive properties of polyaniline (PANI) composite graphene / polyaniline composite modified electrode performance. Use of graphene polyaniline between the electron donor and electron acceptor interactions, the electrochemical activity of the polyaniline in neutral or even a strong alkaline solution, and by infrared spectroscopy, Raman spectroscopy, and UV spectra were Possible Mechanism. Electrochemical activity of graphene / polyaniline composite materials in neutral solution, with possible applications in the field of bio-sensing space; electrochemical activity in different pH solutions graphene / polyaniline composite material The pH sensing the space of possible applications. (2) the graphene having electrical insulating properties petrolatum mix, the electrochemical performance of the graphene / Vaseline film electrode. Cyclic voltammetry showed that: 10.0 mg / mL, 5.0 mg / mL and 1.0 mg / mL graphene / Vaseline modified electrode can in turn get the regular size electrodes, submicron size electrode nano-and micro-size electrode array, and by simply prepared by mixing the graphene / petrolatum membrane electrode has good electrochemical activity and stability. As a new carbon film electrode material, the the graphene / Vaseline membrane electrode has a potential value in basic electrochemical research and applications. (3) assembly of graphene self-assembled thiols with full electrical insulation properties, graphene / thiol self-assembled film electrode electrochemical properties of the membrane electrode. AC impedance data show that, with increasing assembly time, graphene / thiol self-assembled film electrode electrochemical impedance gradually reduce graphene in thiol SAMs is a controlled assembly process. Cyclic voltammetry tests also showed that graphene assembly time is 120 min and 5 min, respectively, to get the regular size and micro-size graphene nano-electrode array / thiol self-assembled film electrode, and ascorbic acid, dopamine, uric acid has better electrocatalytic activity. At the same time, in order to explore the possible mechanism of the experiment, we discuss the possible causes and impact of electron transfer self-assembly of the electric double layer structure of the membrane electrode two factors. The results show that the electron transfer rate is gradually reduced with the increase of the length of the carbon chain mercaptan oxidation-reduction peak potential difference is gradually increased; the electron transfer rate of the carbon material is rendered as: graphene gt; porous carbon GT; graphite. This using a simple and effective way to preparation of graphene / thiol self-assembled film electrode electrochemical theoretical research and practical application has better prospects.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Electrochemical,electrolytic,magnetic,chemical > Electrolysis and Electrode role
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