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Method for preparing PtM/C catalyst by composite electrodeposition

A composite electrodeposition and catalyst technology, applied in the field of electrodeposition, can solve the problems of accelerated dissolution, migration and separation of Pt nanoparticles, coverage of Pt active sites, corrosion and oxidation, etc. Corrosion and Stability Effects

Inactive Publication Date: 2019-01-25
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as a noble metal, Pt has limited resources and high cost. When used as an anode catalyst for alcohol fuel cells, the interaction with oxygen-containing carbon species (especially CO) formed in the oxidation of alcohols is very strong, which is easy to cause The Pt active sites are covered and blocked, leading to its activity decline; at the same time, the carbon support material is susceptible to corrosion and oxidation under acidic and oxidizing conditions and long-term operation at high operating voltage, thereby accelerating the dissolution of Pt nanoparticles. Migration and separation, leading to a severe decrease in its stability

Method used

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  • Method for preparing PtM/C catalyst by composite electrodeposition

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: Composite electrodeposition prepares PtPd / CB catalyst:

[0031] The first step, the pretreatment of the matrix

[0032] The conductive glass substrate is sequentially activated, washed with water and dried.

[0033]The second step is to prepare PtPd / CB plating solution

[0034] The plating solution is composed of Pt salt, the second component Pd metal salt, additives, active carbon black and solvent.

[0035] Pt salt K 2 (PtCl 4 ), the second component Pd metal salt Na 2 PdCl 6 , sodium dodecylbenzenesulfonate, and activated carbon black were added into deionized water, and fully dissolved at 80° C. for 20 hours to obtain a PtPd / CB plating solution. The molar ratio of the Pt salt to the second component Pd metal salt is 5:3. The concentration of Pt salt in the PtPd / CB bath is 0.1mol / L, the concentration of the second component Pd metal salt is 0.06mol / L, the concentration of additives is 0.01mol / L, and the mass concentration of activated carbon blac...

Embodiment 2

[0038] Embodiment 2: Composite electrodeposition prepares PtAg / CB catalyst:

[0039] The first step, the pretreatment of the matrix

[0040] The carbon paper substrate is activated, washed with water, and dried in sequence.

[0041] The second step is to prepare PtAg / CB plating solution

[0042] The plating solution is composed of Pt salt, second component Ag metal salt, additives, active carbon black and solvent.

[0043] Pt salt H 2 Pt(NO 2 ) 6 SO 4 , the second component Ag metal salt AgNO 3 , sodium lauryl sulfate, and activated carbon black were added into deionized water, and fully dissolved at 20° C. for 2 hours to obtain a PtAg / CB plating solution. The molar ratio of the Pt salt to the second component Ag metal salt is 1:20. The concentration of Pt salt in the PtAg / CB bath is 0.05mol / L, the concentration of the second component Ag metal salt is 1mol / L, the concentration of additives is 0.05mol / L, and the mass concentration of activated carbon black is 65mg / L. ...

Embodiment 3

[0046] Embodiment 3: Composite electrodeposition prepares PtRu / CNFs catalyst:

[0047] The first step, the pretreatment of the matrix

[0048] Degreasing, activating, washing with water and drying are carried out sequentially on the nickel foam substrate.

[0049] The second step is to prepare the PtRu / CNFs plating solution

[0050] The plating solution is composed of Pt salt, second component metal salt, additive, carbon nanofiber and solvent.

[0051] Pt salt Pt(acac) 2 , the second component Ru metal salt Ru(acac) 3 , fatty acid polyethylene glycol ester and carbon nanofibers are added to [BMIM]BF 4 In the ionic liquid, under the condition of 75° C., fully dissolve it after stirring for 15 hours to obtain the PtRu / CNFs plating solution. The molar ratio of the Pt salt to the second component Ru metal salt is 50:1. The concentration of Pt salt in the PtRu / CNFs bath is 1mol / L, the concentration of the second component Ru metal salt is 0.02mol / L, the concentration of addi...

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Abstract

The invention provides a method for preparing a PtM / C catalyst by composite electrodeposition, and belongs to the technical field of electrodeposition. According to the method, insoluble carbon carrier particles are added in a plating solution, stirring or ultrasonic vibration are performed, and a DC power supply is used for setting different currents and voltages to make the carbon carrier particles and the PtM alloy co-deposited on a cathode so as to form the PtM / C catalyst, wherein the bonding force between the carbon carrier and catalyst alloy metal is good, the particles are uniformly dispersed and the specific surface area is very large. The adopted composite electrodeposition method under stirring or ultrasonic conditions can not only make the nanoparticles of the PtM / C catalyst uniformly and stably loaded on the carbon carrier, but also has simple preparation process, mild reaction conditions and strong controllability.

Description

technical field [0001] The invention belongs to the technical field of electrodeposition, and relates to a method for preparing a PtM / C catalyst by composite electrodeposition. Background technique [0002] Composite electrodeposition is also called composite electroplating. Its principle is based on the theory of electrocrystallization and dispersion strengthening. The electrochemical co-deposition method is used to add insoluble solid particles to the electroplating solution and make them stably suspended in the plating solution, or take necessary measures The particles are rationally arranged on the surface of the substrate, and the metal ions (one or more) are reduced and precipitated on the cathode, and the particles are covered and embedded in the deposition layer to form a composite deposition layer with excellent performance. Composite deposition layer has both the properties of matrix metal deposition layer and mosaic particles, and plays an important role in the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56C25D15/00H01M4/92
CPCC25D3/56C25D15/00H01M4/921Y02E60/50
Inventor 任雪峰吕前远柳丽芬刘碧荷
Owner DALIAN UNIV OF TECH