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Self-nitrogen-doped palladium-loaded porous composite structure oxygen reduction catalyst, and preparation method and application thereof

A composite structure and catalyst technology, applied in structural parts, rayon manufacturing, electrochemical generators, etc., can solve the problems of increased process difficulty, low adsorption capacity, low specific surface area, etc., to reduce production costs, improve activity, and reduce production costs. The effect of large surface area

Active Publication Date: 2021-06-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, electrospinning technology has been skillfully applied to the preparation of carbon nanofibers. However, traditional carbon nanofibers have disadvantages such as low specific surface area and low adsorption capacity. It is usually necessary to add additional pore-forming agents (such as PMMA, etc.) to obtain porosity. Carbon nanofibers, but will introduce impurities and increase the difficulty of the process

Method used

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  • Self-nitrogen-doped palladium-loaded porous composite structure oxygen reduction catalyst, and preparation method and application thereof
  • Self-nitrogen-doped palladium-loaded porous composite structure oxygen reduction catalyst, and preparation method and application thereof
  • Self-nitrogen-doped palladium-loaded porous composite structure oxygen reduction catalyst, and preparation method and application thereof

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Embodiment 1

[0041] Weigh 200mg NaPdCl 4 , 100mg GO, 1g PVP and 1g PAN were dissolved in 10gDMF solvent, stirred evenly to dissolve completely, and the electrospinning precursor solution was obtained. Put the precursor solution into a 10ml syringe, select a needle with an inner diameter of 0.5±0.02mm, put the syringe into the electrospinning machine, set the distance between the roller and the needle to 16cm, the rotating speed of the roller to 500rpm / min, and the advancing speed of the syringe to 0.3ml / h , Voltage 20kV. After the spinning is completed, the raw silk obtained by spinning is placed in a tube furnace, pre-oxidized in an air atmosphere at 280°C for 2 hours, carbonized in a nitrogen atmosphere at 800°C for 2 hours, and then heated at 200°C in N 2 / H 2 (Flow rate ratio 3:1) reduced in the atmosphere for 2h to obtain Pd / CNF-GO catalyst. Take 4mg of the prepared Pd / CNF-GO catalyst and disperse it in 0.5ml of nafion aqueous solution (0.05%). After ultrasonication for 30min, take...

Embodiment 2

[0050] Weigh 200mg K 2 PdCl 6 , 100mg GO, 1g PVP and 1g PAN were dissolved in 10g DMF solvent, stirred evenly to dissolve completely, and the electrospinning precursor solution was obtained. Put the precursor solution into a 10ml syringe, select a needle with an inner diameter of 0.4±0.02mm, put the syringe into the electrospinning machine, set the distance between the roller and the needle to 12cm, the rotating speed of the roller to 500rpm / min, and the advancing speed of the syringe to 0.2ml / h , Voltage 16kV. After the spinning is completed, the raw silk obtained by spinning is placed in a tube furnace, pre-oxidized in an air atmosphere at 260 ° C for 2 h, carbonized in a nitrogen atmosphere at 800 ° C for 2 h, and then heated at 200 ° C N 2 / H 2 (Flow rate ratio 3:1) reduced in the atmosphere for 2h to obtain Pd / CNF-GO catalyst. Take 4mg of the prepared Pd / CNF-GO catalyst and disperse it in 0.5ml of nafion aqueous solution (0.05%). After ultrasonication for 30min, take ...

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Abstract

The invention discloses a self-nitrogen-doped palladium-loaded porous composite structure oxygen reduction catalyst, and a preparation method and an application thereof. The preparation method comprises the following steps: preparing a spinning solution from polyvinylpyrrolidone, polyacrylonitrile, an organic solvent, graphene oxide and palladium salt, carrying out electrostatic spinning, and sequentially carrying out pre-oxidation, carbonization and reduction treatment on an obtained precursor to obtain the self-nitrogen-doped palladium-loaded porous composite structure oxygen reduction catalyst which has the characteristics of a large specific surface area, rich mesoporous structures, uniform morphology and the like. The catalyst is used as a cathode oxygen reduction catalyst for a proton exchange membrane fuel cell, has the characteristics of high catalytic activity, high stability under an alkaline condition and the like, and is simple in preparation process and low in cost, a pore forming agent and a nitrogen doping reagent do not need to be additionally added in the preparation process, the process steps are simplified and production cost is reduced.

Description

technical field [0001] The invention relates to a proton exchange membrane fuel cell (PEMFC) cathode oxygen reduction catalyst, in particular to a self-doped nitrogen-supported palladium porous composite structure oxygen reduction catalyst, and also relates to its preparation method and application in a proton exchange membrane fuel cell. The invention belongs to the technical field of proton exchange membrane fuel cell electrode materials. Background technique [0002] In view of the high demand for energy and environmental pollution, green and sustainable energy is a goal commonly pursued by society. Renewable and non-polluting energy technologies such as proton exchange membrane fuel cells have attracted the attention and research of many researchers. However, its commercialization is limited by the slow kinetics of its cathode catalyst. Therefore, the preparation of highly active and stable cathodic oxygen reduction catalysts has become the key. [0003] In proton exc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/92D01F1/10D01F9/21D01F9/22
CPCH01M4/921H01M4/926H01M4/88D01F9/22D01F9/21D01F1/10H01M2008/1095Y02E60/50
Inventor 梁伊丽宣蔚谢诗逸谢志勇韦伟峰
Owner CENT SOUTH UNIV
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