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A kind of nanocomposite oxygen electrode material, its preparation method and application

A nanocomposite, oxygen electrode technology, applied in battery electrodes, nanotechnology, nanotechnology, etc., can solve the problems of high electrode catalyst price, susceptibility to toxicity and other problems

Active Publication Date: 2020-04-14
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the technical defects of the above-mentioned electrode catalysts at the present stage, such as high price, easy poisoning and poor stability, the present invention uses transition metals to synthesize heteroatom-doped carbon nanotubes in one step at high temperature, and designs and assembles heteroatoms based on transition metal particle-induced growth. doped carbon nanotube composites

Method used

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  • A kind of nanocomposite oxygen electrode material, its preparation method and application
  • A kind of nanocomposite oxygen electrode material, its preparation method and application
  • A kind of nanocomposite oxygen electrode material, its preparation method and application

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Effect test

Embodiment 1

[0041] Such as figure 1 As shown, the nanocomposite oxygen electrode material is a bifunctional N-CNTs / Ni composite material, which is prepared by a one-step high-temperature calcination synthesis method. Simply put, nickel nitrate, melamine, and glucose are mixed into a certain amount of distilled water, and stirred to make the three substances evenly mixed, and then evaporated and dried. Subsequently, the dried precursor was placed in a tube furnace and calcined in a nitrogen atmosphere at 800 °C. When the temperature reaches 500°C, the metal salt begins to decompose and transform into elemental metal particles; at the same time, melamine transforms into layered graphite-like carbon three nitrogen four (g-C 3 N 4 ), while the glucose is transformed into graphitic carbon, and the two carbon materials are layered on top of each other in a stacked fashion. When the temperature reaches 800℃, g-C 3 N 4 It is decomposed into small fragments containing C and N elements, and th...

Embodiment 2

[0045] Defects on the N-CNTs / Ni surface are formed during the synthesis process. When the temperature reaches 500 degrees Celsius, glucose decomposes and turns into graphitic carbon, while melamine turns into g-C 3 N 4 . When the temperature is further increased to 800°C, g-C 3 N 4 Further breaks down into small pieces and provides an element-rich source of C and N. At the same time, based on the catalytic effect of the metal particles, various carbon fragments reintegrate to grow carbon nanotubes. During the catalytic reaction using FeCo metal particles as the catalytic source, a large number of oxygen-containing functional groups are embedded in the carbon fragments. At this time, the carbon atoms bonded to the oxygen atoms cannot be sp 2 The covalent bond pattern binds to other carbon atoms, thus, defects are created in the disconnected carbon atoms. In addition, the N atoms strongly coordinated with the metal nanoparticles are also simultaneously doped into the carbo...

Embodiment 3

[0048] In order to further test the practicability of N-CNTs / Ni, N-CNTs / Ni was made into an oxygen electrode and applied to a zinc-air battery to observe its electrode performance ( Figure 12). The test results show that the Zn-air battery with N-CNTs / Ni as oxygen electrode has the same resistance as that of Pt / C-IrO 2 The similarity indicates that the working environment of the two is similar. The open circuit potential test shows that the open circuit potential of the zinc-air battery with N-CNTs / Ni as the oxygen electrode is comparable to that of Pt / C-IrO 2 close to. The discharge test results show that the discharge polarization curve of the zinc-air battery with N-CNTs / Ni as the oxygen electrode is similar to that of Pt / C-IrO 2 are similar, and the overpotential values ​​of the two are similar; while the power density of N-CNTs / Ni is that of Pt / C-IrO 2 91.5%. Further discharge tests show that N-CNTs / Ni has the same properties as Pt / C-IrO 2 Similar specific capacita...

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Abstract

The invention belongs to the technical field of energy storage material application, and provides a nano-composite oxygen electrode material. This nanocomposite oxygen electrode material includes carbon nanotubes with hollow inner cavities surrounded by carbon layers, metal particles are distributed in the inner cavities of the carbon nanotubes, the carbon nanotubes The layers are doped with heteroatoms. The nano-composite oxygen electrode material of the present invention is a core-shell nano-tubular composite material, which exhibits excellent oxygen catalysis ability, and shows high power density, energy density and stability when applied to metal-air batteries.

Description

technical field [0001] The invention belongs to the technical field of application of energy storage materials. The embodiment provides a nanocomposite oxygen electrode material, and the preparation, synthesis and performance research of the nanocomposite oxygen electrode material. Background technique [0002] Traditional energy sources such as coal, petroleum and other fossil energy sources are severely lacking, and their pollution to the environment is becoming more and more serious. The concept of green energy and sustainable ecological environment has put forward new requirements for the search for a new generation of energy technologies. Therefore, clean, efficient, and low-cost renewable energy and sustainable energy conversion technologies have undoubtedly become the pursuit of replacing traditional fossil fuels. As a representative clean energy conversion device, rechargeable metal-air battery has the advantages of zero pollution and high energy conversion rate, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/96H01M4/88H01M12/08B82Y30/00
CPCH01M4/88H01M4/96H01M12/08B82Y30/00Y02E60/10
Inventor 刘兆清成晖王孝通李楠王东耀
Owner GUANGZHOU UNIVERSITY
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