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Oxygen reduction electrocatalyst for aromatic diazonium salt surface modified MXene loaded platinum and preparation method of oxygen reduction electrocatalyst

A surface modification and electrocatalyst technology, which is applied in nanotechnology, circuits, electrical components, etc. for materials and surface science, to achieve the effect of enhancing interaction force, cheap and easy-to-obtain raw materials, and alleviating the effect of easy corrosion

Active Publication Date: 2019-06-07
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a two-dimensional MXene nanomaterial loaded based on aromatic diazonium salt surface modification for the corrosion of the carbon carrier of the cathode catalyst of the proton exchange membrane fuel cell in the recycling process and the dissolution and agglomeration of platinum. Electrocatalyst of noble metal platinum particles and preparation method thereof

Method used

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  • Oxygen reduction electrocatalyst for aromatic diazonium salt surface modified MXene loaded platinum and preparation method of oxygen reduction electrocatalyst
  • Oxygen reduction electrocatalyst for aromatic diazonium salt surface modified MXene loaded platinum and preparation method of oxygen reduction electrocatalyst
  • Oxygen reduction electrocatalyst for aromatic diazonium salt surface modified MXene loaded platinum and preparation method of oxygen reduction electrocatalyst

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Effect test

Embodiment 1

[0030] First, 4.8 g of LiF was added to 60 mL of hydrochloric acid solution with a concentration of 9 mol / L contained in a polytetrafluoroethylene beaker at room temperature, and LiF was fully dissolved after continuous magnetic stirring for 15 min, and then 3 g of Ti 3 AlC 2 Slowly add the powder into the above solution for 30 minutes, heat up to 60°C and react for 48 hours. After the reaction, the mixture is washed with deionized water and centrifuged at 3500 rpm for 5 minutes. Repeat the cleaning and centrifugation for 5 times. The supernatant after each centrifugation was poured out as waste liquid, and fresh deionized water was added until the pH value of the supernatant was neutral, and then the obtained precipitate was vacuum-dried at 60°C with nitrogen for 12 hours to obtain two Viti 3 C 2 Nano powder;

[0031] Then weigh 0.3g two-dimensional Ti 3 C 2 The powder was dispersed in 100 mL of water, and the aqueous dispersion of the two-dimensional Ti3C2 powder was ob...

Embodiment 2

[0034] First, 2 g of LiF was added to 60 mL of hydrochloric acid solution with a concentration of 9 mol / L contained in a polytetrafluoroethylene beaker at room temperature, and the LiF was fully dissolved after continuous magnetic stirring for 15 min, and then 2 g of Ti 3 AlC 2 Slowly add the powder into the above solution for 30 minutes, heat up to 35°C and react for 72 hours. After the reaction, the mixture is washed with deionized water and centrifuged at 3500 rpm for 5 minutes. Repeat the cleaning and centrifugation for 6 times. The supernatant after each centrifugation was discarded as a waste liquid, and fresh deionized water was added until the pH value of the supernatant was neutral, and then the obtained precipitate was vacuum-dried at 40°C with nitrogen for 24 hours to obtain two Viti 3 C 2 Nano powder;

[0035] Then weigh 1g of two-dimensional Ti 3 C 2 The powder was dispersed in 100 mL of water, and the aqueous dispersion of the two-dimensional Ti3C2 powder wa...

Embodiment 3

[0038] Firstly, 1 g of LiF was added to 60 mL of hydrochloric acid solution with a concentration of 9 mol / L contained in a polytetrafluoroethylene beaker at room temperature, and the LiF was fully dissolved after continuous magnetic stirring for 15 min, and then 1 g of Ti 3 AlC 2 Slowly add the powder into the above solution for 30 minutes, heat up to 45°C and react for 48 hours. After the reaction, the mixture is washed with deionized water and centrifuged at 3500 rpm for 5 minutes. Repeat the cleaning and centrifugation for 6 times. The supernatant after each centrifugation was discarded as a waste liquid, and fresh deionized water was added until the pH value of the supernatant was neutral, and then the obtained precipitate was vacuum-dried at 25 ° C for 48 h with nitrogen to obtain two Viti 3 C 2 Nano powder;

[0039] Then weigh 2g of two-dimensional Ti 3 C 2 The powder was dispersed in 100 mL of water, and the aqueous dispersion of the two-dimensional Ti3C2 powder wa...

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Abstract

The invention discloses an oxygen reduction electrocatalyst for aromatic diazonium salt surface modified MXene loaded platinum and a preparation method of the oxygen reduction electrocatalyst. The method comprises the steps: performing grafting of an aromatic functional group with high chemical activity on the surface of a two-dimensional nanosheet through aromatic diazonium salt, and then loadingplatinum nanoparticles by taking diazonium salt surface modified two-dimensional MXene as a carrier to serve as an electrochemical catalyst of a fuel cell cathode. Thearomatic functional group chemically grafted on the surface of the two-dimensional MXene has high chemical activity, and is combined with the two-dimensional MXene in a covalent bond form, wherein the strong interaction between theplatinum nanoparticles and the metal nanoparticles firmly anchors the high-dispersion platinum nanoparticles on the two-dimensional MXene carrier, and prevents agglomeration, migration and dissolutionof the precious metal nanoparticles during long-time working, thereby greatly improving the electrocatalytic performance of the two-dimensional MXene substrate loaded platinum catalyst. The synthesismethod of the catalyst is simple in preparation process, low in raw material cost, low in precious metal loss and high in catalytic activity, and can be used for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical fields of surface chemistry, nanometer materials and catalysis, and in particular relates to an oxygen reduction electrocatalyst with aromatic diazonium salt surface-modified MXene loaded with platinum and a preparation method thereof. Background technique [0002] In the field of proton exchange membrane fuel cells, the most effective oxygen reduction reaction cathode catalyst is highly dispersed platinum or platinum-based alloy nanoparticles, usually supported on a carbon material substrate. However, because the carbon support is easily corroded during recycling and the platinum-carbon reaction leads to the migration, dissolution and agglomeration of platinum, the electrochemical activity and durability of platinum nanoparticles will be rapidly weakened; while the reserves of metal platinum in nature are low And it is expensive, which limits the commercial large-scale application of carbon-supported platinum cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M4/88B82Y30/00B82Y40/00
CPCY02E60/50
Inventor 王红兵崔云康刘宁宁赵斌刘津升涂宏庆吴军方德龙
Owner NANJING INST OF TECH
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