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A kind of self-doped nitrogen-supported palladium porous composite structure oxygen reduction catalyst and its preparation method and application

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: 2022-07-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of self-doped nitrogen-supported palladium porous composite structure oxygen reduction catalyst and its preparation method and application
  • A kind of self-doped nitrogen-supported palladium porous composite structure oxygen reduction catalyst and its preparation method and application
  • A kind of self-doped nitrogen-supported palladium porous composite structure oxygen reduction catalyst and its preparation method and application

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Embodiment 1

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

Embodiment 2

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

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Abstract

The invention discloses a self-doped nitrogen-supported palladium porous composite structure oxygen reduction catalyst and a preparation method and application thereof. Polyvinylpyrrolidone, polyacrylonitrile, organic solvent, graphene oxide and palladium salt are prepared into a spinning solution for electrospinning, and the obtained raw silk is subjected to pre-oxidation, carbonization and reduction treatment in turn, so as to obtain a large specific surface area, rich in A self-doped nitrogen-supported palladium porous composite structure oxygen reduction catalyst with mesoporous structure and uniform morphology. The catalyst is used as a cathode oxygen reduction catalyst for proton exchange membrane fuel cells, showing high catalytic activity and high stability under alkaline conditions. In addition, the preparation process of the catalyst is simple and the cost is low, and the preparation process does not need to add additional pore-forming agent and nitrogen-doping agent, which simplifies the process steps and reduces the production cost.

Description

technical field [0001] The invention relates to a cathode oxygen reduction catalyst of a proton exchange membrane fuel cell (PEMFC), in particular to a self-doped nitrogen-supported palladium porous composite structure oxygen reduction catalyst, and also relates to a preparation method and application thereof in a proton exchange membrane fuel cell, The invention belongs to the technical field of electrode materials for proton exchange membrane fuel cells. Background technique [0002] In view of the high demand for energy and environmental pollution, green and sustainable energy is a common goal pursued by society. Renewable, pollution-free energy technologies such as proton exchange membrane fuel cells have attracted the attention and research of many researchers. However, its commercialization has been hampered by the slow kinetics of its cathode catalyst. Therefore, the preparation of cathodic oxygen reduction catalysts with high catalytic activity and high stability h...

Claims

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Application Information

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Patent Type & Authority Patents(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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