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Graphene composite, application of graphene composite to catalytic methanol oxidation, chemically modified electrode and preparation method of graphene composite

A technology for modifying electrodes and graphene, which is applied in the field of electroanalytical chemistry, can solve the problems of unsatisfied, lack of particle size and shape control of catalyst particles, etc.

Active Publication Date: 2014-01-15
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the catalyst particles prepared by it lack particle size and shape control, and to a certain extent still fail to meet the needs of industrial production of catalysts for methanol fuel cells.

Method used

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  • Graphene composite, application of graphene composite to catalytic methanol oxidation, chemically modified electrode and preparation method of graphene composite
  • Graphene composite, application of graphene composite to catalytic methanol oxidation, chemically modified electrode and preparation method of graphene composite
  • Graphene composite, application of graphene composite to catalytic methanol oxidation, chemically modified electrode and preparation method of graphene composite

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preparation example Construction

[0042] The present invention preferably carries out the in-situ preparation of the above-mentioned graphene composite on the surface of the base electrode, and provides a preparation method of a modified electrode comprising the following steps:

[0043] a) coating the graphene dispersion on the surface of the ITO substrate electrode, and obtaining the graphene-modified ITO electrode after drying;

[0044] b) the graphene-modified ITO electrode is placed in a Prussian blue electrolyte, and the first electrochemical deposition obtains a Prussian blue-graphene-modified electrode;

[0045] c) placing the Prussian blue-graphene modified electrode in a chloroplatinic acid solution, and second electrochemical deposition to obtain the modified electrode described in the above technical scheme.

[0046]In the invention, the graphene dispersion liquid is coated on the surface of the ITO base electrode, and the graphene-modified TIO electrode is obtained after drying. In the present in...

Embodiment 1

[0067] Place the ITO in acetone, ethanol and deionized water in turn for 30 minutes, and finally rinse with deionized water and dry at room temperature;

[0068] Disperse graphene in deionized water and ultrasonically for 2 hours to obtain a graphene dispersion with a mass concentration of 1 mg / mL;

[0069] Apply 2 μL of the above graphene dispersion on the surface of the dried ITO, and dry it under an infrared lamp to obtain a graphene-modified ITO electrode (GN / ITO);

[0070] Immerse GN / ITO in a molar concentration of 2×10 -3 mol / L of K 3 [Fe(CN) 6 ] and a molar concentration of 2×10 -3 mol / L FeCl 3 In the electrodeposition solution, which also includes KCl with a molar concentration of 0.1 mol / L and HCl with a molar concentration of 0.01 mol / L as the electrolyte; a Prussian blue-graphene modified electrode was obtained by constant potential deposition at 0.4V for 60s ( PB / GN / ITO);

[0071] Rinse PB / GN / ITO with secondary water, and then place it in KCl with a mass conc...

Embodiment 2

[0077] In the present invention, the Pt / PB / GN / ITO obtained in Example 1 is placed in an aqueous KCl solution with a molar concentration of 0.5 mol / L, and at a sweep rate of 50 mV / s, cyclic voltammetry is used to detect that the modified electrode has a concentration of 0.5 mol / L. Cyclic voltammetry curves in aqueous KCl solution of L.

[0078] The result is as image 3 As shown in A, image 3 A is the cyclic voltammetry curve that embodiment 2 of the present invention and comparative example 4 obtain, wherein image 3 A (a) is the cyclic voltammetry curve that the embodiment of the present invention 2 obtains, image 3 There are two pairs of redox peaks in A(a), which correspond to Prussian white / PB (0.17V / 0.13V) and PB / berlin green (0.90V / 0.82V), which are typical of PB. Redox peaks, the peak potential difference of the first pair of redox peaks is only 41mV, which shows that the electron transfer process in Pt / PB / GN / ITO is faster.

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Abstract

The invention provides a graphene composite which comprises a graphene layer, a prussian blue layer arranged on the graphene layer and nano platinum particles arranged on the prussian blue layer. In the graphene composite, existence of prussian blue enables the nano platinum particles deposited on the prussian blue surface to have a small average particle size so as to give a larger active surface area to a catalyst; moreover, the characteristics of a prussian blue complex are also beneficial for enhancing interaction between Pt and graphene and reducing fall-off of the catalyst on the surface of an electrode so as to improve catalytic stability of the catalyst; furthermore, strong interaction exists between iron ions at the center of the prussian blue and CO, so that toxic adsorption of CO to the Pt catalyst can be reduced to a certain degree and the desorption oxidation process of CO is promoted, and thus, toxicity resistance of the catalyst is obviously improved. Therefore, the graphene composite provided by the invention has higher catalytic activity on catalytic oxidation on methanol and a stronger antitoxic effect.

Description

technical field [0001] The invention relates to the technical field of electroanalytical chemistry, in particular to a graphene composite, its application in catalytic methanol oxidation, a chemically modified electrode and a preparation method thereof. Background technique [0002] With the increasing scarcity of non-renewable resources and the increasing demand for energy in modern industrial production, the development and utilization of new energy from renewable resources has become an urgent issue in today's society. Methanol, due to its wide range of sources and low price, has been studied as a form of new energy utilization in recent years, and methanol fuel cell is one of them. Methanol fuel cell is a kind of proton exchange membrane fuel cell, which directly uses methanol aqueous solution or steam methanol as fuel supply source, without reforming methanol, gasoline and natural gas to produce hydrogen for power generation. Methanol fuel cells have the characteristic...

Claims

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Application Information

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IPC IPC(8): B01J31/22H01M4/92
CPCY02E60/50
Inventor 王宗花夏建飞张菲菲夏霖史国玉李延辉夏延致
Owner QINGDAO UNIV
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