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Fuel cell anode catalyst and preparation method and application thereof

A fuel cell and catalyst technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of indeterminate Ru-P composition of the catalyst, long reaction time, and insufficient activity and stability of the Ru-P catalyst. Improvement and other issues

Active Publication Date: 2020-09-15
SUZHOU INSTITUE OF WUHAN UNIV
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AI Technical Summary

Problems solved by technology

However, the shortcomings of this preparation method are: the preparation process is greatly affected by the pH value of the reaction system, and the carrier impregnation process has the disadvantage of limited load; at the same time, the activity and stability of the Ru-P catalyst have not been greatly improved. The degree of improvement, the Ru-P catalyst is not a synthetic phosphorus compound, there are defects that the composition of the catalyst Ru-P cannot be determined, and the reaction time is too long
However, the disadvantages of this preparation method are: the preparation method has the disadvantages that the product particles are large and easy to agglomerate; the RuP catalyst has the disadvantages of agglomeration and fewer active sites

Method used

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  • Fuel cell anode catalyst and preparation method and application thereof
  • Fuel cell anode catalyst and preparation method and application thereof
  • Fuel cell anode catalyst and preparation method and application thereof

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preparation example Construction

[0071] The invention provides a method for preparing a fuel cell anode catalyst, comprising the following steps:

[0072] S1. Add the transition metal source and trioctylphosphine oxide into the reaction vessel according to a predetermined ratio, mix them, stir and heat to a heating temperature of 90-150°C under vacuum conditions, and keep the heating temperature for the first reaction for 5-60 minutes;

[0073] S2. After the first reaction described in step S1 is completed, the entire reaction system is filled with inert gas, heated to a reaction temperature of 180-400°C, and a predetermined amount of phosphorus source is added, and the second reaction is carried out at the reaction temperature for 0.1-400°C. 6h;

[0074] S3, after the second reaction described in step S2 is completed, cooling, washing and vacuum drying are performed to obtain a reaction product, and then the reaction product is subjected to a loading reaction with a carbon carrier to obtain a predetermined l...

Embodiment 1

[0108] A preparation method of fuel cell anode catalyst:

[0109] S1, 0.1mmol ruthenium acetylacetonate (Ru(acac) 3 ) and 1 g of trioctylphosphine oxide (TOPO) were added into a 50 mL reaction vessel, heated to 120° C. under vacuum with electromagnetic stirring, and kept for 30 min.

[0110] S2, and then fill the whole system with N 2 , heated to a reaction temperature of 320° C., injected 0.5 mL of tri-n-octylphosphine (TOP), and maintained the reaction temperature for 2 h.

[0111] S3, the reaction is completed, cooled to room temperature, the prepared product is centrifugally washed with ethanol and n-hexane, and then dried under vacuum conditions to prepare Ru-P nanoparticles. Take 5 mg of Ru-P nanoparticles, and add 20 mg of XC-72 carbon carrier into 20 mL of n-hexane and mix evenly, 2 Stir overnight at room temperature under an atmosphere, and dry by centrifugation. The product was then heated at 600°C in 5% H 2 / 95%N 2 Calcined under atmosphere to obtain the final...

Embodiment 2

[0125] S1. Add 0.1 mmol of palladium acetylacetonate and 1 g of trioctylphosphine oxide (TOPO) into a 50 mL reaction vessel, heat to 120° C. under vacuum with electromagnetic stirring, and keep for 30 min.

[0126] S2, and then fill the whole system with N 2 , heated to a reaction temperature of 320° C., injected 0.5 mL of tri-n-octylphosphine (TOP), and maintained the reaction temperature for 2 h.

[0127]S3, the reaction is completed, cooled to room temperature, the prepared product is centrifugally washed with ethanol and n-hexane, and then dried under vacuum conditions to prepare Pd 3 P nanoparticles. Take Pd 3 5 mg of P nanoparticles, and 20 mg of XC-72 carbon carrier were added to 20 mL of n-hexane and mixed evenly, and the 2 Stir overnight at room temperature under atmosphere, and dry by centrifugation to obtain the final 20% loaded catalyst Pd 3 P / C, for HOR test of rotating disk electrode system.

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Abstract

The invention provides a fuel cell anode catalyst and a preparation method and application thereof. According to the preparation method, transition metal is used as a metal source, trioctylphosphine oxide is used as a reaction solvent, a reaction product is prepared through a colloid synthesis method, and then the reaction product and a carbon carrier are subjected to a load reaction to obtain theload type transition metal phosphide anode catalyst. The anode catalyst has high-alkalinity HOR activity and high stability, is relatively low in preparation cost, is suitable for commercial mass production, and has a huge application prospect in the field of fuel cells. Specifically, ruthenium acetylacetonate is used as a ruthenium source, trioctylphosphine oxide is used as a reaction solvent, and tri-n-octylphosphine is used as a phosphorus source. The anode catalyst Ru2P / C is prepared according to the preparation method. When the loading capacity of the anode catalyst Ru2P / C is 0.4mgcm<-2>, the peak power of 1.3Wcm<-2> (the current density is 3.0Acm<-2>) can be achieved under the conditions of 80 DEG C and the back pressure of 0.1Mpa. The mass ratio exchange current density (j<0, m>) of the anode catalyst Ru2P / C is 0.27mAmug<-1>, the area ratio exchange current density (j<0, s>) of the anode catalyst Ru2P / C is 0.37mAcm<-2>, and the mass ratio exchange current density and the area ratio exchange current density of the anode catalyst Ru2P / C respectively reach three times of those of the Ru / C.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a fuel cell anode catalyst and its preparation method and application. Background technique [0002] With the development of the economy, problems such as the shortage of traditional fossil energy and environmental pollution are becoming more and more serious, and all countries are accelerating the research and development of new energy technologies. As a device that can directly convert hydrogen energy into electricity, proton exchange membrane fuel cells (PEMFCs) are considered to be the most important renewable energy conversion technology, which consists of the hydrogen oxidation reaction (HOR) at the anode and the oxygen reduction reaction at the cathode. (ORR). At present, the high performance of proton exchange membrane fuel cells relies on Pt-based catalysts. However, metal Pt has problems such as low reserves, high price, and easy to be poisoned by CO, which restric...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/9041H01M4/9083H01M4/88H01M2004/8689Y02E60/50
Inventor 罗威赵元萌杨甫林王雪薇程功臻
Owner SUZHOU INSTITUE OF WUHAN UNIV
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