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Platinum (Pt)/reduced graphite oxide (RGO) nano composite material and preparation method and application thereof

A nanocomposite material and graphene technology, which is applied in the field of platinum/graphene nanocomposite materials and its preparation, can solve the problems of restricting the large-scale production of graphene, achieve good industrial prospects, strong safety, and reduce production costs.

Active Publication Date: 2012-10-24
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The general chemical reduction process requires the use of toxic and strong reducing agents hydrazine and sodium borohydride or requires high temperature or strong corrosive conditions [a.Y.Si, E.T.Samulski, Nano Lett, 2008, 8, 1679-1682; b. Chinese invention patent, ZL201010251395.4], these limit the large-scale production of graphene

Method used

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  • Platinum (Pt)/reduced graphite oxide (RGO) nano composite material and preparation method and application thereof
  • Platinum (Pt)/reduced graphite oxide (RGO) nano composite material and preparation method and application thereof
  • Platinum (Pt)/reduced graphite oxide (RGO) nano composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1, preparation Pt / RGO nanocomposite material

[0050] 1) Ultrasonic dispersion of 100mg of GO in 50mL of ethylene glycol solution, ultrasonic stripping and dispersion with an ultrasonic processor at room temperature for 1h (ultrasonic power 650W).

[0051] 2) Then add 1.773mL of 19.72g / L chloroplatinic acid solution in ethylene glycol and 48mL of 0.52mol / L sodium hydroxide solution in ethylene glycol, and mix thoroughly until the pH of the mixed solution is 12.

[0052] 3) Subsequently, transfer the mixed liquid to the irradiation tube, pass argon gas for 30 minutes to remove the oxygen in the system, seal the nozzle and place 60 Coγ-rays were irradiated at room temperature with a dose rate of 300Gy / min and an absorbed dose of 300kGy. After the irradiation, the sample was filtered through a polypropylene (PP) membrane with a pore size of 0.45 μm. The filtered filter cake is rinsed with ethanol, treated with ultrasonic waves for 5 minutes each time, and then...

Embodiment 2

[0056] Example 2. Electrode material and electrochemical performance test using Pt / RGO nanocomposite as active component

[0057] Measurement of the specific capacitance of the Pt / RGO nanocomposite: Mix 25.5 mg of the Pt / RGO nanocomposite prepared in Example 1 with 3 mg of acetylene black and 1.5 mg of PVDF, mix evenly with a mortar, then disperse the mixture with NMP, and spread evenly On the nickel foam current collector, dry at 60°C for 4 hours, then flatten the electrode sheet with a tablet press, and then dry at 60°C for 12 hours. After weighing the dried electrode sheet, vacuum soak it in 6M KOH electrolyte for 2 hours. Then the working electrode, Hg / HgO reference electrode and graphite auxiliary electrode were assembled into a three-electrode system. At different current densities (0.05, 0.1, 0.2, 0.4, 0.6, 0.8, 1, 1.5, 2, 3, 4, 5, 7.5, 10, 15, 20, 30, 40, 50, 75, 100A / g) , Determination of constant current charge and discharge performance, measurement of cyclic volta...

Embodiment 3

[0060] Embodiment 3, preparation Pt / RGO nanocomposite material

[0061] Consistent with the reduction method of Example 1, in step 3), the electron beam radiation produced by the electron accelerator is used to induce the generation of solvent electrons and reducing free radicals as reducing agents, and the obtained RGO and Pt / RGO, wherein in Pt / RGO The loading amount of Pt is 10wt%, and the carbon-oxygen ratio is 5.2. Consistent with the method of Example 2, the electrochemical performance of the Pt / RGO nanocomposite was measured. The properties of the RGO and Pt / RGO nanocomposites prepared in this example are comparable to those of Example 1.

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Abstract

The invention discloses a platinum (Pt) / reduced graphite oxide (RGO) nano composite material and a preparation method and application thereof. According to the preparation method, graphite oxide (GO) and a platinum metal precursor are reduced in one step by radiation and induction of a gamma ray or an electronic beam, thus obtaining the Pt / RGO nano composite material with the Pt load capacity being 1.0wt% to 15wt%; Pt nano particles are uniformly distributed on an RGO sheet layer, and the average diameter of the Pt nano particles is 1.8 nanometers; and the particle sizes of the Pt nano particles are within 2 nanometers. By virtue of the load capacity of the nano particles of platinum metal, the reducing degree of the GO can be increased, the conductivity of a product is improved, and the surface utilization rate of the RGO sheet layer is increased. Compared with the GO and pure graphene, the nano composite material prepared by the method has higher specific capacitance and higher high-current multiplying power when being applied to a super-capacitor electrode material.

Description

technical field [0001] The invention relates to a platinum / graphene nanocomposite material and a preparation method and application thereof. Background technique [0002] Supercapacitor is a new type of energy storage device whose performance is between traditional capacitors and batteries. It has the characteristics of high specific energy of batteries and high specific power of traditional capacitors. In addition, supercapacitors also have the advantages of long cycle life, instantaneous high current charge and discharge, and wide operating temperature range. Therefore, they have unique application advantages and broad application prospects in information storage, communication engineering, electric vehicles and other fields. According to different energy storage mechanisms, supercapacitors can be divided into electrochemical double layer capacitors (Electric double layer capacitors) and Faraday pseudocapacitors (Faradic pseudocapacitors). The energy storage of electric d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/058
CPCY02E60/13
Inventor 翟茂林张琦璐张有为彭静李久强
Owner PEKING UNIV
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