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Biomass-based in-situ reduction noble metal-based fuel cell catalyst

A technology of fuel cells and biomass materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as graphitized carbon carrier corrosion, achieve the effects of reducing agglomeration, increasing active sites, and improving catalytic activity

Pending Publication Date: 2022-03-18
CHINA AUTOMOTIVE TECH & RES CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the lack of functional groups on the surface of these new carbon materials to anchor the precursors of noble metals, strong acid oxidation treatment is usually required to introduce polar functional groups, but these introduced polar functional groups are often the source of carbon corrosion, resulting in the entire graphitization Corrosion of carbon supports

Method used

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  • Biomass-based in-situ reduction noble metal-based fuel cell catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of this catalyst material comprises the following steps:

[0028] Add 10 g of glucose, 1 g of chloroplatinic acid hexahydrate, and 80 mL of water into a beaker, and manually stir for 5 minutes to obtain slurry A. Put A in an oven to dry at 80°C and evaporate to obtain solid B. Put the solid B into a porcelain boat, put the porcelain boat into a tube furnace, the atmosphere is nitrogen, raise the temperature to 1000°C at a rate of 5°C / min and keep it for 1h to obtain a catalyst material.

[0029] The biomass material is glucose with a molecular weight of 180; the average nanometer size of the catalyst noble metal is 500nm; the content of the noble metal in the catalyst is 5 wt% of the total mass of the catalyst.

Embodiment 2

[0031] The preparation method of this catalyst material comprises the following steps:

[0032] Add 10 g of chitosan hydrochloride, 1 g of chloroplatinic acid hexahydrate, and 80 mL of water into a beaker, and vibrate ultrasonically for 40 minutes to obtain slurry A. Put A into a rotary evaporator for rotary evaporation, set the rotation speed at 70 r / min, and the temperature at 60°C. After evaporating for 10 hours, solid B was obtained. Put the solid B into a porcelain boat, put the porcelain boat into a tube furnace, the atmosphere is nitrogen, raise the temperature to 800°C at a rate of 5°C / min and keep it for 3h to obtain a catalyst material.

[0033] The biomass material is chitosan hydrochloride with a molecular weight of 610; the average nanometer size of the catalyst precious metal is 200nm; the content of the precious metal in the catalyst is 10 wt% of the total mass of the catalyst.

Embodiment 3

[0035] The preparation method of this catalyst material comprises the following steps:

[0036] Add 10 g of polylactic acid, 1 g of chloroplatinic acid hexahydrate, and 80 mL of water into a beaker, and vibrate ultrasonically for 40 minutes to obtain slurry A. Put A into a rotary evaporator for rotary evaporation, set the rotation speed at 70r / min, and the temperature at 60°C. After evaporating for 10 hours, solid B was obtained. Put the solid B into a porcelain boat, put the porcelain boat into a tube furnace, the atmosphere is nitrogen, raise the temperature to 900°C at a rate of 5°C / min and keep it for 3h to obtain a catalyst material.

[0037] The biomass material is polylactic acid with a molecular weight of about 5000; the noble metal content in the catalyst is 10 wt% of the total mass of the catalyst. figure 1 The TEM figure of the catalyst prepared for this embodiment, from figure 1 It can be seen that the platinum particles are dispersed on the carbon, and the aver...

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Abstract

The invention provides a biomass-based in-situ reduction noble metal-based fuel cell catalyst, which comprises noble metal particles and a carbon material, and the noble metal particles are dispersed on the carbon material in a nano-scale manner; in-situ reduction is achieved by using a biomass material as a carbon source during synthesis of the catalyst. According to the catalyst, a biomass material is used as a carbon source, the catalyst is obtained through in-situ reduction of noble metal, surface functional groups of the biomass material are complexed with the noble metal, so that the noble metal is anchored on the biomass, noble metal agglomeration is reduced, and the biomass is converted into a carbon carrier with a high specific surface area through a roasting process; meanwhile, noble metal is reduced in situ, nitrogen elements in the biomass material are roasted and then doped into the carbon material in the form of nitrogen atoms in different forms, formation of defect sites near the carbon atoms is promoted, active sites in the catalytic reaction of the fuel cell are increased, the catalytic activity is improved, and a new way is provided for resource utilization of the biomass material.

Description

technical field [0001] The invention belongs to the field of fuel cells, in particular to a biomass-based in-situ reduction noble metal-based fuel cell catalyst. Background technique [0002] In recent years, due to the rapid increase in energy demand in modern life, the energy crisis has become increasingly serious. Compared with traditional batteries, hydrogen fuel cells have significant advantages in terms of energy conversion rate, carbon-free emissions, noise and emissions. At present, the commercial hydrogen fuel cell catalyst is platinum / carbon catalyst, and my country has a large gap compared with foreign countries in terms of research and development capabilities and related product performance. The main factors restricting the development of fuel cell catalysts in my country are the large content of noble metals in catalysts, high cost, and complicated preparation processes. Therefore, the development of high-activity, low-cost catalysts is the key to the commercia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/92
CPCH01M4/88H01M4/926H01M4/921Y02E60/50
Inventor 李振国周冰洁邵元凯王建海任晓宁杨春清张利李凯祥吕丛杰
Owner CHINA AUTOMOTIVE TECH & RES CENT