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Pd/HNC catalytic material, preparation method thereof and application of Pd/HNC catalytic material as fuel cell catalyst

A catalytic material and carbonization treatment technology, applied in nanotechnology for materials and surface science, battery electrodes, circuits, etc., can solve problems such as poor stability, achieve good stability, convenient preparation, and good corrosion resistance

Inactive Publication Date: 2020-11-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the defects such as poor stability of existing fuel cell catalysts and their carriers, the first purpose of the present invention is to provide a stable load of Shewanella carboniferous bacteria carrier with high corrosion resistance, good stability and high catalytic activity Pd / HNC Catalytic Materials Obtained from Pd Catalytically Active Substances

Method used

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  • Pd/HNC catalytic material, preparation method thereof and application of Pd/HNC catalytic material as fuel cell catalyst
  • Pd/HNC catalytic material, preparation method thereof and application of Pd/HNC catalytic material as fuel cell catalyst
  • Pd/HNC catalytic material, preparation method thereof and application of Pd/HNC catalytic material as fuel cell catalyst

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Experimental program
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Embodiment 1

[0040] 1. Shewanella culture

[0041] A single colony of Shewanella oneidensis MR-1 was selected and inoculated in 50 mL of sterilized Luria-Bertani medium (5 g of yeast extract, 5 g of NaCl, and 10 g of tryptone per liter of medium) for culture. Shake the shaker at 170 rpm at 30°C for 12 h.

[0042] 2. Adsorption of palladium ions by Shewanella

[0043]Take 4L of sterilized LB culture solution, add 0.08L of activated bacteria (inoculum size 2%), shake at 170rpm at 30°C for 20h, (OD600 about 1.5); then centrifuge at 12000rmp for 7min to collect bacteria, pour The supernatant and the precipitate were washed twice with phosphate buffer solution and sterile water respectively, and the precipitate was weighed (about 47.5g). The washed Shewanella cells were redissolved (sonicated for 0.5h) in an appropriate amount of deionized water and Add an appropriate amount of dilute hydrochloric acid to adjust the pH to 4 for later use; 150mL 1000mg / L Pd 2+ The solution was slowly dripped ...

Embodiment 2

[0055] Change the heat treatment to: firstly pass air from room temperature to 200°C for 1 hour; keep warm at 200°C for 2 hours to partially carbonize and activate the bacterial cells; pass Ar from 200°C to 700°C for 1 hour; hold at 700°C for 2 hours to completely carbonize the bacteria . Other processing conditions are all identical with embodiment 1.

[0056] After carbonization treatment at 700°C, the particle size of the catalyst particles ranges from 3 to 8nm, and the conductivity of the bacterial carbon is improved. The mass specific activity of the carbonized bacteria-supported palladium catalyst obtained at this carbonization temperature in acidic medium is 0.276mA / μg is 1.06 times that obtained by carbonization treatment at 600°C; after 5000 cycle stability tests, the mass specific activity decreased by 10.2%, and the stability is also higher than that obtained by carbonization at 600°C. That is, the activity and stability of the carbonized bacteria-supported pallad...

Embodiment 3

[0058] Change the heat treatment to: firstly, the air is raised from room temperature to 200°C for 1 hour; the temperature is kept at 200°C for 2 hours to partially carbonize and activate the bacterial cells; the Ar is raised from 200°C to 800°C for 1.5 hours; the temperature is kept at 800°C for 2 hours to completely carbonization. Other processing conditions are all identical with embodiment 1.

[0059] After carbonization treatment at 800°C, the particle size of the catalyst particles ranges from 3 to 10 nm, and the conductivity of the bacterial carbon is further improved. The mass specific activity of the carbonized bacteria-supported palladium catalyst obtained at this carbonization temperature in acidic medium is 0.339mA / μg, which is 1.3 times that obtained by carbonization at 600°C; after 5000 cycle stability tests, the mass specific activity has decreased by 8.1%, and the stability is also higher than that obtained by carbonization at 600°C. That is, the activity and...

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Abstract

The invention discloses a Pd / HNC catalytic material, a preparation method thereof and application of the Pd / HNC catalytic material as a fuel cell catalyst. The Pd / HNC catalytic material is formed by uniformly dispersing nano palladium particles on shewanella carbide, and the preparation method comprises the following steps: stirring a palladium source solution and a shewanella solution to enable shewanella to fully adsorb a palladium source, and performing carbonization treatment and reduction treatment on shewanella adsorbed with the palladium source to obtain the Pd / HNC catalytic material. The prepared Pd / HNC catalytic material has high oxygen reduction catalytic activity, has higher stability in both acidic and alkaline environments, and can be used as a catalytic material of a fuel cell.

Description

technical field [0001] The present invention relates to a fuel cell catalyst material, in particular to a Pd / HNC material and a method for using Shewanella bacteria to adsorb a palladium source and preparing a Pd / HNC material through carbonization and reduction, and also relates to a Pd / HNC material used as a fuel cell The application of the catalyst belongs to the field of fuel cell catalysts. Background technique [0002] In recent years, proton exchange membrane fuel cells have attracted the attention of researchers as a green and clean energy conversion device, which can be applied to vehicles and mobile electronic devices. At present, platinum and its alloys are often used as electrode catalysts for proton exchange membrane fuel cells, but there are two important problems in proton exchange fuel cells that have not been resolved: on the one hand, the stability of the catalyst is reduced due to the corrosion of the carbon support; On the one hand, the catalyst uses nobl...

Claims

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Application Information

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IPC IPC(8): H01M4/92B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/926Y02E60/50
Inventor 梁伊丽张绍辉谢志勇
Owner CENT SOUTH UNIV
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