Method for preparing Pt-based catalyst by pulse electrodeposition under ultrasonic conditions

A pulse electrodeposition and catalyst technology, applied in the field of electrodeposition, can solve the problems of Pt-based catalyst falling off, affecting the catalytic effect, particle aggregation, etc., and achieving the effects of improving wetting conditions, enhancing bonding strength, and bonding firmly

Inactive Publication Date: 2019-02-15
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the Pt-based catalyst prepared by chemical reduction is prone to particle aggregation, and the Pt-based catalyst is prone to fall off from the carrier during use, which affects its catalytic effect.

Method used

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  • Method for preparing Pt-based catalyst by pulse electrodeposition under ultrasonic conditions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Preparation of PtRu / C catalyst by pulse electrodeposition under ultrasonic conditions:

[0033] The first step, the surface pretreatment of the base material

[0034] Carry out pretreatment (degreasing, activation, water washing, drying, etc.) on the foamed nickel base material in sequence.

[0035] The second step is to prepare the carbon material suspension

[0036] Preparation of carbon slurry: According to the ratio of adding 2 mg of activated carbon black per milliliter of absolute ethanol, add activated carbon black to absolute ethanol to prepare an ethanol suspension containing activated carbon black. Then add Nafion solution according to the ratio of the volume percentage of activated carbon black ethanol suspension to Nafion solution of 1:100, and ultrasonically disperse for 20 minutes to form carbon slurry.

[0037] The third step, the preparation of the working electrode

[0038] Pipette 160 μL of the above carbon slurry per square centimeter an...

Embodiment 2

[0043] Example 2: Preparation of PtPd / C catalyst by pulse electrodeposition under ultrasonic conditions:

[0044] The first step, the surface pretreatment of the base material

[0045] Carry out pretreatment (degreasing, activation, water washing, drying, etc.) on the copper base material in sequence.

[0046] The second step is to prepare the carbon material suspension

[0047] Preparation of carbon slurry: According to the ratio of adding 4 mg of activated carbon black per milliliter of absolute ethanol, add activated carbon to absolute ethanol to prepare an ethanol suspension containing activated carbon black. Then add the Nafion solution according to the ratio of the volume percentage of the ethanol suspension of activated carbon black to the Nafion solution of 2:100, and ultrasonically disperse for 40 minutes to form a carbon slurry.

[0048] The third step, the preparation of the working electrode

[0049] Pipette 105 μL of the above-mentioned active carbon slurry per...

Embodiment 3

[0054] Example 3: Preparation of PtAg / C catalyst by pulse electrodeposition under ultrasonic conditions:

[0055] The first step, the surface pretreatment of the base material

[0056] Carry out pretreatment (degreasing, activation, water washing, drying, etc.) on the iron matrix material in sequence.

[0057] The second step is to prepare the carbon material suspension

[0058] Preparation of carbon slurry: According to the ratio of adding 8 mg of activated carbon black per milliliter of absolute ethanol, add activated carbon to absolute ethanol to prepare an ethanol suspension containing activated carbon black. Then, according to the ratio of the volume percentage of the ethanol suspension of activated carbon black to the Nafion solution of 4:100, add the Nafion solution and ultrasonically disperse for 80 minutes to form a carbon slurry.

[0059] The third step, the preparation of the working electrode

[0060] Pipette 300 μL of the above carbon slurry per square centimet...

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Abstract

The invention discloses a method for preparing a Pt-based catalyst by pulse electrodeposition under ultrasonic conditions, and belongs to the technical field of electrodeposition. The method combinesadvantages of both pulse electrodeposition and ultrasonic conditions, and electrodeposits to prepare the Pt-based catalyst by separately preparing a desired salt solution as an electroplating solutionin an aqueous solution, an organic solvent or an ionic liquid, and using a carbon material as a carrier, and using a pulse power supply to set different pulse electrodeposition current densities, current on-off time ratios (ton/toff), temperatures and other process parameters. According to the invention, the method for preparing the Pt-based catalyst by combining the pulse electrodeposition withthe ultrasonic conditions is simple in process operation, environmentally-friendly and strong in condition controllability; and the prepared Pt-based catalyst is small in average particle size, largein specific surface area and firm to bond with the carrier.

Description

technical field [0001] The invention belongs to the technical field of electrodeposition, and relates to a method for preparing a Pt-based catalyst by pulse electrodeposition under ultrasonic conditions. Background technique [0002] At present, the catalysts used in fuel cells are the most mature researches on Pt noble metal catalysts based on carbon materials. However, due to the high price of Pt and its easy dissolution and aggregation under harsh operating conditions, its electrocatalytic activity and stability Decline, not up to the requirements of fuel cell commercial catalysts. Aiming at the problem that the Pt catalyst is expensive and the oxidation rate decreases due to catalyst poisoning, many attempts have been made to improve the Pt catalyst. The most effective method is to incorporate non-Pt noble metals, relatively cheap transition metals or non-metals into the Pt catalyst. , forming a Pt-based catalyst, which can effectively reduce the amount of noble metal P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46B01J23/42B01J23/50B01J23/89B01J27/185B01J35/00B01J35/10B01J37/34C25D3/52C25D5/18C25D5/54H01M4/92
CPCB01J23/42B01J23/464B01J23/50B01J23/8906B01J23/8913B01J23/892B01J23/8926B01J27/1856B01J35/0033B01J35/1004B01J37/343B01J37/348C25D3/52C25D5/18C25D5/54H01M4/926Y02E60/50
Inventor 任雪峰吕前远柳丽芬刘碧荷
Owner DALIAN UNIV OF TECH
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