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High-efficiency carbon nanosheet supported fuel cell positive electrode material and preparation method and application thereof

A carbon nanosheet, fuel cell technology, applied in battery electrodes, nanotechnology for materials and surface science, nanotechnology, etc., can solve problems such as low efficiency and poor stability, and achieve excellent stability and excellent oxygen. The effect of reducing performance, simple synthesis method

Active Publication Date: 2019-09-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore, the present invention intends to use a simple method to obtain a composite material coupled with alloy nanoparticles and BNC nanosheets through the joint reaction of nickel phthalocyanine rich in N elements and Co-B nanosheets, and obtain a high-efficiency fuel cell A catalyst for the positive electrode reaction, that is, the oxygen reduction reaction, so as to solve the problems of low efficiency and poor stability in the positive electrode reaction of fuel cells

Method used

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  • High-efficiency carbon nanosheet supported fuel cell positive electrode material and preparation method and application thereof
  • High-efficiency carbon nanosheet supported fuel cell positive electrode material and preparation method and application thereof
  • High-efficiency carbon nanosheet supported fuel cell positive electrode material and preparation method and application thereof

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Embodiment 1

[0040] The formation mechanism of amorphous Co-B nanosheets is as follows: loaded with 0.1M Co(NO 3 ) 2 ·6H 2 The three-necked flask of the O solution was filled with N in an ice-water bath. 2 Stir continuously for more than 30min under the condition, so that the Co ions are evenly dispersed in the solution. Afterwards, place 0.5M NaBH in an ice-water bath 4 Alkaline solution (0.1M KOH) was added dropwise to Co(NO 3 ) 2 In the solution, the period is required to be carried out under the condition of anaerobic and vigorous stirring, as shown in formula 1.

[0041] co 2+ +BH 4 - +H 2 O→Co-B+H 2 +B(OH) 3 (1)

[0042] After about 30 minutes of reaction, the generation of black substance can be clearly observed. Finally, after washing with water and washing with alcohol three times each, the sample obtained by centrifugation was dried overnight under vacuum. Its mechanism diagram is as follows figure 1 As shown, its topography is shown in diagram 2-1 shown.

Embodiment 2

[0044] As described in Example 1, the obtained Co-B and nickel phthalocyanine powders were fully dispersed in the ethanol solution under the condition of ultrasound for 1 h at a mass ratio of 1:1; Stir vigorously for 24 hours; finally, wash with water and alcohol for 3 times, then centrifuge, and dry the obtained sample under vacuum overnight.

Embodiment 3

[0046] The resulting Co-B and nickel phthalocyanine mixture was placed in the middle of a CVD quartz tube as described in Example 2. First, the air pressure in the tube is pumped down to below 5pa by the action of the vacuum pump; at this time, the argon pressure reducing valve is opened, and 100 sccm of argon is continuously passed into the tube, and the two processes of vacuuming and argon are alternately carried out at least 3 times to remove the air inside. Finally, start the heating program, the heating rate is less than 2°C / min, and the heating temperatures are respectively 400°C, 600°C, 800°C, and 1000°C. The morphologies of catalysts obtained under different temperature conditions are as follows: Figure 2-2 As shown, the special structure supported by uniform alloy nanoparticles can only be formed when the temperature is higher than 400 °C and lower than 1000 °C. XRD patterns of samples at different temperatures Figure 2-3 As shown, the synthesis temperature of th...

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Abstract

The invention discloses a preparation method and application of a high-efficiency carbon nanosheet supported fuel cell positive electrode material. According to the method, the NiCo alloy nanoparticleloaded carbon nanosheet supported electrode material is directly generated on the surface on the basis of maintaining the morphology of the amorphous Co-B nanosheet by utilizing carbonization of nickel phthalocyanine and the Co-B nanosheet under high temperature and reduction reaction of metal ions under the premise that BH4- reduces Co2+ ion to synthesize a Co-B amorphous template. With application of different kinds of metal phthalocyanines, the metal composition of alloys can be controlled effectively. Furthermore, NiCo@BNC-800 having the nanosheet morphology exhibits excellent performance. In the oxygen reduction reaction of the fuel cell positive electrode, the starting potential is 1.03 V and the half-wave potential is 0.85 V, which is higher than that of commercial Pt / C electrode.Meanwhile, the stability and the methanol resistance of the composite electrode are better than those of the commercial Pt / C electrode. A general and simple method can be provided for synthesizing thehigh-efficiency fuel cell positive electrode material.

Description

technical field [0001] The invention relates to the technical field of oxygen reduction reaction in fuel cell anodes, in particular to a preparation method and application of a carbon nanosheet supported material supported by transition metal nanoparticles. Background technique [0002] Oxygen reduction reactions are thought to involve O 2 The most important reaction in the energy conversion device such as fuel cell cathode reaction. However, since the reaction involves a 4-electron transfer process, the slow reaction kinetics and high overpotential seriously hinder the development of energy-responsive devices. As the best catalyst for oxygen reduction reaction, the noble metal Pt has limited its large-scale application due to its high price and poor stability. Therefore, in order to improve the energy conversion efficiency of these energy converters, the core issue is to develop a non-precious metal catalyst that can replace these noble metal materials and perform better ...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/86H01M4/90B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/8652H01M4/8663H01M4/8803H01M4/8825H01M4/9016H01M4/9083H01M2004/8689Y02E60/50
Inventor 张兴旺余春林雷乐成
Owner ZHEJIANG UNIV
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