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Preparation method for nitrogen-doped carbon dot/graphene oxide nanocomposite electrocatalyst

A nitrogen-doped carbon dot and nanocomposite technology, applied in nanotechnology, circuits, electrical components, etc., can solve problems affecting the performance and service life of fuel cells, slow kinetic process, poor stability, etc., to achieve strong The effect of oxygen reduction electrocatalytic performance, good stability and good conductivity

Inactive Publication Date: 2018-07-13
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The oxygen reduction reaction (ORR) kinetics of the fuel cell cathode is very slow, and the use of a large amount of noble metal platinum catalyst makes the battery cost too high
At the same time, the poor stability also affects the working performance and service life of the fuel cell

Method used

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  • Preparation method for nitrogen-doped carbon dot/graphene oxide nanocomposite electrocatalyst
  • Preparation method for nitrogen-doped carbon dot/graphene oxide nanocomposite electrocatalyst
  • Preparation method for nitrogen-doped carbon dot/graphene oxide nanocomposite electrocatalyst

Examples

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Embodiment 1

[0025] A preparation method for preparing nitrogen-doped carbon dots / graphene oxide (N-Cdots / GO) nanocomposite electrocatalyst of the present invention, such as figure 1 , including the following steps:

[0026] Step 1. Weigh 2.673g of citric acid, 0.90g of urea and 0.05g of graphene oxide, dissolve them in 30.0mL of ultrapure water in turn, put them into an ultrasonic instrument and sonicate until they are evenly dispersed;

[0027] Step 2. Transfer the above mixed solution to a 50mL polytetrafluoroethylene-lined stainless steel autoclave, place it in a blast heating oven, and conduct a hydrothermal reaction at 180°C for 12 hours;

[0028] Step 3, after the reaction is finished, cool down to room temperature naturally to obtain a dark brown liquid;

[0029] Step 4, use a high-speed centrifuge to remove impurities such as excess citric acid at a speed of 10000rmp for 10 minutes;

[0030] Step 5. The centrifuged sample was placed in a vacuum drying oven at 50° C. for 24 hours...

Embodiment 2

[0032] A method for preparing nitrogen-doped carbon dots (N-Cdots) for comparison with N-Cdots / GO of the present invention, the only difference between Example 2 and Example 1 is that graphite oxide is not used in the synthesis process alkenes as templates.

Embodiment 3

[0034] A method for preparing a nitrogen-doped carbon dot / graphene oxide mixture that is compared with N-Cdots / GO of the present invention is by directly mixing an appropriate amount of nitrogen-doped carbon dots prepared in Example 2 with graphene oxide get.

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Abstract

The invention discloses a preparation method for a nitrogen-doped carbon dot / graphene oxide nanocomposite electrocatalyst. The preparation method comprises the following steps: ultrasonically dissolving citric acid, urea and graphene oxide in ultrapure water, carrying out a hydrothermal reaction at 160-200 DEG C for 10-13 h after uniform dispersion, and after the reaction is completed, carrying out natural cooling to room temperature; and removing excess citric acid and urea through centrifugation, and carrying out vacuum drying at 40-60 DEG C for 23-25 h to remove water so as to obtain thenitrogen-doped carbon dot / graphene oxide nanocomposite electrocatalyst. Compared with commercial Pt / C catalysts, the N-Cdots / GO nanocomposite electrocatalyst disclosed in the invention presents excellent electrocatalytic performance with a corrected initial potential (0.13 V vs. Ag / AgCl), greater current density (up to 18.4 mA at -0.70 V), excellent electrochemical stability and resistance to methanol or carbon monoxide toxicity; in addition, compared with a mixture of N-Cdots and N-Cdots / GO, the N-Cdots / GO nanocomposite electrocatalyst shows catalytic efficiency comparable to the commercial Pt / C catalysts.

Description

technical field [0001] The invention belongs to the technical field of preparation of carbon nanomaterials, and relates to a preparation method of a nitrogen-doped carbon dot / graphene oxide nanocomposite electrocatalyst with high catalytic performance, in particular to a method using urea as a nitrogen source, citric acid as a carbon source, Graphene oxide is used as a template, and a method for preparing and synthesizing nitrogen-doped carbon dots / graphene oxide nanocomposites by a hydrothermal method. Background technique [0002] The oxygen reduction reaction (ORR) kinetics of the fuel cell cathode is very slow, and the use of a large amount of noble metal platinum catalyst makes the battery cost too high. At the same time, poor stability also affects the working performance and service life of the fuel cell. Therefore, the development of cheap, easy-to-obtain and highly stable oxygen reduction catalysts is the fundamental solution to reduce the cost of fuel cells and im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/96B82Y40/00
CPCB82Y40/00H01M4/8647H01M4/88H01M4/96Y02E60/50
Inventor 华艳单丹朱文军李怡萱宗丽萍
Owner NANJING UNIV OF SCI & TECH
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