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Preparation method of dual-element or multi-element noble metal catalyst for fuel cell

A precious metal catalyst, fuel cell technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of high price, reduce catalyst utilization, limited, etc., and achieve the beneficial effect of improving utilization, activity and life.

Active Publication Date: 2020-08-25
WUXI WEIFU HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, precious metal resources are limited and expensive, so it is necessary to improve the utilization efficiency of precious metals, and the preparation of nanoscale uniformly dispersed supported catalysts is undoubtedly necessary to promote the development of low-temperature fuel cells
[0004] Due to the use of highly conductive nano-activated carbon, in the conventional impregnation method, a large number of noble metal catalyst particles filled with nanopores inside the activated carbon do not participate in the electrochemical reaction of the fuel cell, which greatly reduces the utilization of the catalyst.

Method used

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  • Preparation method of dual-element or multi-element noble metal catalyst for fuel cell
  • Preparation method of dual-element or multi-element noble metal catalyst for fuel cell
  • Preparation method of dual-element or multi-element noble metal catalyst for fuel cell

Examples

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Effect test

Embodiment 1

[0033] The preparation of binary catalyst Pt-Ru / C (Pt-Ru:30%, Pt / Ru=1 (atomic ratio)) for fuel cell comprises the following steps:

[0034] (1) Activated carbon XC-72R (particle size 30nm) was pre-treated with 5mol / L nitric acid solution, dried at 200°C for 4 hours, weighed 5g and dispersed with 400mL ultrapure water for 30 minutes to obtain carbon slurry;

[0035] (2) Dissolve 3.9g chloroplatinic acid (containing 1.44g Pt) and 1.94g ruthenium trichloride (containing 0.72g Ru) into 50mL ultrapure water to prepare a platinum-ruthenium mixed solution, and transfer it to the carbon slurry after ultrasonic oscillation for 20 minutes After fully stirring for 4 hours, add 50 mL of 1 mol / L citric acid solution, continue stirring for 4 hours, add ammonia water to adjust the pH of the mixed solution to 7.2, and form a sol. Put the sol into a metal bath heating device, and the temperature of the metal bath is 120°C, heat while stirring, the heating time is 30min, the sol turns into a vi...

Embodiment 2

[0039] The preparation of binary catalyst Pt-Co / C (Pt:20%, Pt / Co=2) for fuel cell comprises the following steps:

[0040] (1) Activated carbon XC-72R (particle size 30nm) was pre-dried at 200°C for 4 hours, weighed 2g and dispersed with 75mL ultrapure water for 30 minutes to obtain a carbon slurry;

[0041] (2) Measure 15 mL of chloroplatinic acid / water solution (Pt: 38.5 mg / mL), measure 10.0 mL of cobalt nitrate water solution (Co: 30 mg / mL) and mix, transfer to carbon slurry after ultrasonic oscillation for 40 minutes, and stir thoroughly for 4 After one hour, add 200 mL of 1 mol / L citric acid solution, continue to stir for 4 hours, add ammonia water to adjust the pH value of the mixed solution to 10.8, and form a sol, put the sol in a metal bath heating device, the temperature of the metal bath is 100 ° C, Heating while stirring, the heating time is 2h, the sol turns into a viscous gel, and then cool down to 25°C;

[0042] (3) Use a porcelain boat to take a certain amount ...

Embodiment 3

[0045] The preparation of the fuel cell three-way catalyst Pt-Ir-Ru / C (Pt: 20%, Pt / Ir / Ru=1) comprises the following steps:

[0046] (1) Activated carbon XC-72R (particle size 30nm) was pre-dried at 200°C for 4 hours, weighed 2g and dispersed with 75mL ultrapure water for 30 minutes to obtain a carbon slurry;

[0047] (2) Measure 8 mL of chloroplatinic acid aqueous solution (Pt: 50 mg / mL), measure 10 mL of ruthenium trichloride / water (Ru: 10.4 mg / mL) and mix, measure chloroiridic acid aqueous solution (Ir: 20 mg / mL) 10mL, mixed with ultrasonic vibration for 30 minutes, then transferred to carbon slurry, after 40 minutes of ultrasonic vibration, transferred to carbon slurry, after fully stirring for 4 hours, add 100mL of 1mol / L citric acid solution, continue stirring for 2 hours, add ammonia water to adjust the mixed solution When the pH reaches 9.0, a sol is formed. Put the sol into a metal bath heating device. The temperature of the metal bath is 90°C, and heat while stirring....

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Abstract

The invention belongs to the technical field of fuel cells, and particularly relates to a preparation method of a dual-element or multi-element noble metal catalyst for a fuel cell. One or more transition metal components are introduced into noble metal, and the noble metal and the transition metal are alloyed, so that the oxygen reduction activity of the alloyed cathode is higher than that of single-component noble metal, and the loading capacity of the noble metal can be reduced; and the spherical porous activated carbon is adopted, more active sites can be exposed out of the catalyst due tothe large specific surface area of the spherical porous activated carbon, and the prepared nano-alloy particles are all concentrated on the surface of the carbon carrier, so that the utilization rateof the catalyst can be increased. In the preparation process, one or more precursor solutions form sol-gel, and macromolecular citric acid and metal ions are complexed to form a whole, so that nano-alloy particles can be prevented from being embedded into internal pores of activated carbon, alloying of the nano-alloy particles can be improved, and the performance of the catalyst is improved.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a preparation method of a binary or multi-element noble metal catalyst for a fuel cell. Background technique [0002] For the supported noble metal catalysts used in fuel cells, there are already very mature preparation methods, and it is easy to achieve a high degree of dispersion of the supported metals. This type of catalyst is also relatively easy to prepare. The more common method is to first impregnate the noble metal precursor in Carrier, and then reduce at a certain temperature. However, it is not easy to achieve a high degree of dispersion of supported metals for high-loaded supported metal catalysts, especially bi-component and multi-component metal catalysts, which have a wider range of applications, resulting in low utilization of noble metals. [0003] The catalysts used in low-temperature fuel cells such as proton exchange membrane fuel cells (PEMFCs...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90H01M4/92
CPCH01M4/8825H01M4/926H01M4/9083H01M4/9041H01M4/921Y02E60/50
Inventor 张义煌张明华秋茹陈杰李刚
Owner WUXI WEIFU HIGH TECH CO LTD
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