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Ultrahigh-stability oxygen reduction catalyst for room-temperature hydrogen fuel cell

A fuel cell, stable technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of high cost of platinum, no decline in ORR electrocatalyst activity, slow electrocatalyst kinetics, etc., and achieve a simple, mild and excellent synthesis method The effect of catalytic performance and stability

Pending Publication Date: 2022-08-09
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its large-scale commercialization is severely hampered by sluggish oxygen reduction reaction (ORR) electrocatalyst kinetics in batteries, high cost of platinum (Pt), and poor surface stability.
There are no reports of ORR electrocatalysts without activity degradation after more than 140,000 potential cycles

Method used

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  • Ultrahigh-stability oxygen reduction catalyst for room-temperature hydrogen fuel cell
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  • Ultrahigh-stability oxygen reduction catalyst for room-temperature hydrogen fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Synthesize PtCu octahedral alloy and store in water;

[0020] (2) take by weighing 20mg ascorbic acid and 20mg polyvinylpyrrolidone in the three-necked flask, and add the PtCu octahedral alloy (0.02mmol) gained in step (1), add 5mL ultrapure water, stir at room temperature;

[0021] (3) adding 9uL of chloroplatinic acid (0.1M) to the mixed solution in step (2), and reacting in an oil bath at 100° C. for 2 hours;

[0022] (4) The product obtained in step (3) is cooled, washed, and centrifuged to obtain a PtCu alloy, and the sample is dispersed and stored in ethanol.

Embodiment 2

[0024] (1) Synthesize PtCu octahedral alloy and store in water;

[0025] (2) take by weighing 20mg ascorbic acid and 20mg polyvinylpyrrolidone in the three-necked flask, and add the PtCu octahedral alloy (0.02mmol) gained in step (1), add 5mL ultrapure water, stir at room temperature;

[0026] (3) 12.5uL of chloroplatinic acid (0.1M) was added to the mixed solution in step (2), and the reaction was carried out in an oil bath at 100° C. for 2 hours;

[0027] (4) The product obtained in step (3) is cooled, washed, and centrifuged to obtain a PtCu alloy, and the sample is dispersed and stored in ethanol.

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Abstract

The invention discloses an ultrahigh-stability oxygen reduction catalyst for a room-temperature hydrogen fuel cell, which is characterized in that copper-rich octahedral PtCu is adopted as a seed, a PtCu cluster is epitaxially grown on an octahedral PtCu / Pt core-shell structure, and the size of the PtCu cluster is 0.8-2.1 nm. The synthesis method is simple and mild, and an X-ray diffraction spectrum shows that the synthesized PtCu nanoparticles are face-centered cubic alloy. The mass activity of the PtCu alloy in oxygen reduction is 1.42 A mg <-1 >, which is 8.9 times that of commercial carbon-loaded platinum. After 140,000 cycles of accelerated stability test, the activity of the PtCu alloy still keeps 102.1% of the initial activity, while the commercial carbon-loaded platinum is reduced by 43.8% after 10,000 cycles of accelerated stability test.

Description

technical field [0001] The present invention relates to an ultra-high stability oxygen reduction catalyst for room temperature hydrogen fuel cells. Background technique [0002] Proton exchange membrane fuel cells (PEMFCs) are highly efficient and sustainable power generation devices that are expected to solve social crises such as fossil resource depletion and environmental degradation. However, its large-scale commercialization is severely hindered by the slow oxygen reduction reaction (ORR) electrocatalyst kinetics, high platinum (Pt) cost, and poor surface stability in batteries. The introduction of abundant transition metals and the construction of heteronuclear bimetallic alloy clusters show great promise to overcome these problems. During the industrialization of proton exchange membrane fuel cells, activity durability and surface structural stability are more challenging than the initial activity of ORR electrocatalysts. There are no reports of ORR electrocatalysts...

Claims

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Application Information

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IPC IPC(8): H01M4/92H01M4/88B22F1/06B22F1/07B22F1/17B22F9/24
CPCH01M4/921H01M4/88B22F1/17B22F1/07B22F9/24B22F1/06Y02E60/50
Inventor 袁强赵凤玲
Owner GUIZHOU UNIV
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