Oxygen reduction catalyst and preparation method thereof

A catalyst, cobalt oxide technology, applied in the field of electrochemistry, can solve the problems of low precious metal platinum reserves, limited metal-air batteries and fuel cells, high price, and achieve good half-wave potential effect.

Active Publication Date: 2020-03-24
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the most important oxygen reduction catalyst is the noble metal platinum catalyst, but the precious metal platinum reserves are small and the price is high, causing platinum-based catalysts to account for 56% of the total cost of metal-air batteries and fuel cells, which has become a limitation for metal-air batteries and fuel cells. The main obstacle to the practical application of batteries

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  • Oxygen reduction catalyst and preparation method thereof
  • Oxygen reduction catalyst and preparation method thereof
  • Oxygen reduction catalyst and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] Example 1 Preparation of copper-cobalt-nickel-based nitrogen-doped carbon nanotubes

[0030] (1) Synthesis of copper-cobalt oxide

[0031] Put nickel foam with a length of 3 cm and a width of 1 cm in 40 mL of 10% hydrochloric acid, and ultrasonically clean it for 15 minutes in an ultrasonic cleaner.

[0032] Weigh 0.2428 g of copper nitrate, 0.2939 g of cobalt nitrate, and 0.5351 g of urea into a beaker, add 60 mL of deionized water, and stir for 1 h at room temperature. When the stirring is completed, the solution is a uniform pink solution. The stirred solution and the cleaned foamed nickel were placed in a Teflon-lined autoclave, and hydrothermally reacted in an oven at 120 °C for 12 h to obtain a copper-cobalt oxide nanosheet composite. Rinse 3-5 times respectively, and then dry in an oven at 60°C.

[0033] (2) Preparation of copper-cobalt-nickel-based nitrogen-doped carbon nanotubes

[0034] The copper-cobalt oxide obtained in step (1) was calcined at 400 °C for...

Embodiment 2

[0035] Example 2 Composition and structural characteristics of copper-cobalt-nickel-based nitrogen-doped carbon nanotubes

[0036] Scanning electron microscope images such as figure 1 shown in a-c. After hydrothermal treatment, the nickel foam skeleton has a uniform copper-cobalt oxide nanosheet composite with a length of about 1 μm, which makes the surface of the nickel foam nanoscale. After calcination, nanotubes embedded with transition metal nanoparticles are obtained, and the nanoparticles cover the top of each nanotube, as figure 1shown in d-f; figure 1 The lattice distance in f is about 0.235 nm, corresponding to the C(100) plane. The average diameter of these carbon nanotubes is 800 nm. According to the element map, such as figure 1 As shown in g-m, it can be seen that copper, cobalt, and nickel nanoparticles are not only distributed on the tip or inside, but also uniformly distributed on the surface of carbon nanotubes. At 520 °C and 540 °C, high-temperature der...

Embodiment 3

[0038] Example 3 Electrochemical properties of copper-cobalt-nickel-based nitrogen-doped carbon nanotubes

[0039] The electrochemical performance of copper-cobalt-nickel based nitrogen-doped carbon nanotubes was studied. The linear sweep voltammetry curves at different scan rates are as follows: image 3 as shown in a. Depend on image 3 a It can be seen that the catalyst has a high oxygen reduction activity, with an initial voltage of 0.96eV and a half-slope voltage of 0.87eV at a rotational speed of 1600 rpm. Notably, its catalytic activity for the oxygen reduction reaction is higher than that of some previously reported transition metal and nitrogen-doped carbon materials. Depend on image 3 b It can be seen that the Koutecky−Levich (K-L) curve at the corresponding potential shows an approximately parallel linear relationship, and the value of the electron transfer number (n) is 3.77-4.00, indicating that there is a complete four-electron transfer path. Depend on im...

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Abstract

The invention provides a preparation method of an oxygen reduction catalyst. Nanoparticles of three transition metals, namely copper, cobalt and nickel, are embedded into nitrogen-doped carbon nanotubes with uniform particle sizes through hydrothermal and calcining methods in sequence, and the transition metals are uniformly distributed at the top end and on a tube body. The preparation method issimple in steps and low in cost, and compared with reported nano carbide, the prepared catalyst has good initial potential and half-wave potential, has excellent methanol resistance and stability, canbe applied to electrochemical energy conversion equipment such as metal-air batteries and fuel cells, and has important significance.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and specifically relates to a nitrogen-doped carbon nanotube catalyst containing three transition metals of copper, cobalt and nickel and a preparation method thereof. Background technique [0002] Clean and efficient energy conversion devices such as metal-air batteries and fuel cells convert chemical energy directly into electrical energy through electrochemical reactions. This process does not require combustion and is not limited by the Carnot cycle, thereby improving energy conversion efficiency and reducing unnecessary energy loss. Therefore, these energy conversion devices will surely become the main energy means for human applications in the future. At present, metal-air batteries and fuel cells are facing a series of scientific and technical challenges, the most important of which is that the oxygen reduction reaction at the cathode is a process with slow kinetics, and the reac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M12/06
CPCH01M4/8825H01M4/8885H01M4/9041H01M4/9075H01M12/06Y02E60/50
Inventor 赵振路怀杰高存源沙骑骑
Owner UNIV OF JINAN
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