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A lithium ferrous phosphate supported platinum oxygen reduction electrocatalyst and preparation method thereof

A technology of lithium ferrous phosphate and electrocatalyst, which is applied in the direction of circuits, electrical components, battery electrodes, etc., can solve the problems of difficulty in large-scale application and high price of lithium cobalt oxide, and achieve the goal of improving efficiency, reducing load, and facilitating penetration Effect

Active Publication Date: 2020-06-16
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the price of lithium cobalt oxide is much higher than that of lithium iron phosphate, and there are certain difficulties in large-scale application

Method used

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  • A lithium ferrous phosphate supported platinum oxygen reduction electrocatalyst and preparation method thereof
  • A lithium ferrous phosphate supported platinum oxygen reduction electrocatalyst and preparation method thereof
  • A lithium ferrous phosphate supported platinum oxygen reduction electrocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) First, 11.5 mmol LiH 2 PO 4 , 10.0 mmol FeSO 4 . 7H 2 O, 8 mmol Co(NH 2 ) 2 Mix and add 40 mL of ethylene glycol to a 250 mL three-necked flask, and place the above solid-liquid mixture at 35 o C water bath mechanically stirred for 4 h until dissolved; after stirring evenly, the clear solution obtained after dissolution was transferred to a 50 mL autoclave and heated at 180 o C was reacted in a blast oven for 20 h; the reacted suspension was centrifuged at 9000 rpm, washed with distilled water, and then placed at 80 o C dried in a vacuum oven for 18 h to obtain green lithium iron phosphate powder.

[0022] (2) Weigh 320 mg of the green lithium iron phosphate powder prepared above, pipette 8 mL of 10 g / L chloroplatinic acid solution and disperse it in 0.1 mol / L NaOH to adjust the solution to pH=10 ethylene glycol, placed in a 250 mL three-necked flask, wherein the amount of ethylene glycol is 50 mL, under nitrogen atmosphere, 130 o Reflux in a C oil bath for...

Embodiment 2

[0025] (1) First, 19.0 mmol LiH 2 PO 4 , 1.0 mmol LiCl, 10.0 mmol FeSO 4 . 7H 2 O, 12 mmol Co(NH 2 ) 2 Mix and add 40 mL of ethylene glycol to a 250 mL three-necked flask, and place the above solid-liquid mixture at 35 o Mechanically stir in a water bath for 4 h to dissolve; after stirring evenly, transfer the dissolved clear solution to a 50 mL autoclave, o C was reacted in a blast oven for 20 h; the reacted suspension was centrifuged at 8000 rpm, washed with distilled water, and then placed in a 80 o C dried in a vacuum oven for 8 h to obtain green lithium iron phosphate powder.

[0026] (2) Weigh 360 mg of the green lithium iron phosphate powder prepared above, pipette 4 mL of 10 g / L chloroplatinic acid solution and disperse it in 0.1 mol / L NaOH to adjust the solution to pH=10 ethylene glycol, placed in a 250 mL three-necked flask, the amount of ethylene glycol is 40 mL, under nitrogen atmosphere, 140 o Reflux in a C oil bath for 3 h, then let it stand for 12 h, ce...

Embodiment 3

[0028] (1) First add 20 mmol LiH 2 PO 4 , 1.5 mmol Li 2 SO 4 , 10.0 mmol Fe(NO 3 ) 2 , 16 mmol Co(NH 2 ) 2 Mix and add 40 mL of ethylene glycol to a 250 mL three-neck flask, and place the above solid-liquid mixture at 35 o Mechanically stir in a water bath for 4 h to dissolve; after stirring evenly, transfer the dissolved clear solution to a 50 mL autoclave, o C was reacted in a blast oven for 20 h; the reacted suspension was centrifuged at 7000 rpm, washed with distilled water, and then placed at 80 o C dried in a vacuum oven for 8 h to obtain green lithium iron phosphate powder.

[0029] (2) Weigh 320 mg of the green lithium iron phosphate powder prepared above, pipette 8 mL of 10 g / L chloroplatinic acid solution and disperse it in 0.1 mol / L NaOH to adjust the solution to pH=10 ethylene glycol, placed in a 250 mL three-necked flask, the amount of ethylene glycol used is 50 mL, under argon atmosphere, 150 o Reflux in a C oil bath for 3 h, then let stand for 15 h, ce...

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Abstract

The invention discloses a lithium iron phosphate loaded platinum-oxygen reduction electrocatalyst. The lithium iron phosphate loaded platinum-oxygen reduction electrocatalyst is characterized in that a lithium iron phosphate carrier is bowknot-shaped and is composed of a thin slice which is 30-60 nm in thickness and 4-10 microns in radial direction; platinum particles are uniformly loaded on the lithium iron phosphate nano-sheet; and the platinum nano-particles are 1-3 nm in size and have the load mass percentage of 3-10%. The preparation method of the electrocatalyst comprises the steps of preparing the bowknot-shaped lithium iron phosphate by utilizing a solvent heating method; then reducing chloroplatinic acid by utilizing ethylene glycol; and uniformly loading the platinum nano-particles on the lithium iron phosphate nano-sheet. The advantages are that a novel platinum loaded efficient catalytic carrier is provided to reduce the load amount of the platinum and improve the utilization efficiency of the platinum, and meanwhile the preparation process is simple and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of fuel cell electrocatalysts and preparation thereof, in particular to a lithium ferrous phosphate supported platinum nanoparticle oxygen reduction electrocatalyst and a preparation method thereof. Background technique [0002] Due to its high energy conversion efficiency, high specific energy and specific power, and environmental friendliness, fuel cells have attracted widespread attention from researchers. As an effective clean energy source, they are expected to be widely used in electric vehicles and portable electronic devices. However, the oxygen reduction reaction at the cathode is a four-electron transfer process, and its slow kinetics severely limits the commercialization of fuel cells. At present, the most effective catalyst for oxygen reduction reaction is carbon-supported platinum catalyst, but its large-scale use is limited due to the scarcity and high price of platinum in nature. Therefore, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/92H01M4/88
CPCH01M4/8825H01M4/9075H01M4/92Y02E60/50
Inventor 杨文胜许娜姜俏
Owner BEIJING UNIV OF CHEM TECH
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