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Method for carbon supported ultra-low platinum catalytic electrode preparation by indirect galvanic deposit

A catalytic electrode and electrodeposition technology, applied to battery electrodes, fuel cell parts, circuits, etc., to achieve the effect of low platinum loading and high electrocatalytic performance

Inactive Publication Date: 2009-02-04
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing carbon-supported ultra-low platinum catalytic electrodes by indirect electrodeposition for the shortcomings of the existing two-step pulse electrodeposition of Pt

Method used

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  • Method for carbon supported ultra-low platinum catalytic electrode preparation by indirect galvanic deposit
  • Method for carbon supported ultra-low platinum catalytic electrode preparation by indirect galvanic deposit
  • Method for carbon supported ultra-low platinum catalytic electrode preparation by indirect galvanic deposit

Examples

Experimental program
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Effect test

Embodiment 1

[0041] (1), preparation of microporous layer

[0042] First, soak the carbon paper in an aqueous ethanol solution, vibrate for 30 minutes under ultrasonic conditions, then soak it in a 30% polytetrafluoroethylene emulsion for 30 minutes, and then bake it in a muffle furnace at a temperature of 340 ° C for 40 minutes to obtain a hydrophobic paper. diffusion layer. Weigh polytetrafluoroethylene and Vulcan XC-72 carbon powder according to the mass ratio of PTFE: Vulcan XC-72 carbon powder is 1:1, then use ethanol as solvent to oscillate evenly under ultrasonic conditions, and apply it several times On the surface of the pretreated carbon paper, it was finally placed in a muffle furnace at a temperature of 340° C. and baked for 45 minutes to obtain a microporous layer.

[0043] (2) Preparation of porous carbon electrodes bonded with perfluorosulfonic acid resin

[0044] Perfluorosulfonic acid resin: the mass ratio of Vulcan XC-72 carbon powder is 1: 30 to take perfluorosulfonic ...

Embodiment 2

[0057] Steps (1)-(2) are the same as steps (1)-(2) in Example 1.

[0058] (3) Four-step electrodeposition method to prepare highly dispersed Cu / PCE electrodes with controllable size

[0059] Adopt two-electrode system, the perfluorosulfonic acid resin bonded porous carbon electrode that makes with the step (2) is cathode, and metal copper is anode; Electrolyte is 0.25g / L copper sulfate and 98g / L sulfuric acid solution, electrodeposition The temperature is 10°C, and a four-step electrodeposition method is used to prepare a highly dispersed Cu / PCE electrode with controllable size on a perfluorosulfonic acid resin-bonded porous carbon electrode. The process parameters of the four-step electrodeposition are:

[0060] The first step: the peak current density is 0.1A / dm 2 , the conduction time is 150s;

[0061] Step 2: The peak current density is 5A / dm 2 , the conduction time is 5s;

[0062] Step 3: The peak current density is 0.1A / dm 2 , the conduction time is 120s;

[0063] ...

Embodiment 3

[0068] Steps (1)-(2) are the same as steps (1)-(2) in Example 1.

[0069] (3) Four-step electrodeposition method to prepare highly dispersed Cu / PCE electrodes with controllable size

[0070] Adopt two-electrode system, the perfluorosulfonic acid resin bonding porous carbon electrode that makes with (2) step is negative electrode, and metal copper is anode; Electrolyte is 188g / L copper nitrate and 196g / L sulfuric acid solution, electrodeposition temperature At 25°C, a four-step electrodeposition method was used to prepare a highly dispersed Cu / PCE electrode with controllable size on a perfluorosulfonic acid resin-bonded porous carbon electrode. The process parameters of the four-step electrodeposition were:

[0071] Step 1: The peak current density is 0.5A / dm 2 , the conduction time is 100s;

[0072] Step 2: The peak current density is 10A / dm 2 , the conduction time is 3s;

[0073] Step 3: The peak current density is 0.5A / dm 2 , the conduction time is 60s;

[0074] Step 4...

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Abstract

The invention provides a method for preparing a carbon-supported ultra-low platinum catalytic electrode by means of indirect electrodeposition, which belongs to the fuel cell technique field. The method comprises the steps: transition metal M (such as: Cu, Co, Ni and the like) nano-particles in an aqueous solution are highly dispersed and deposited on a porous carbon electrode (PCE) bonded with perfluoro-sulfonated resin through a four-step electrodeposition method, then the obtained M / PCE electrode is immerged into a platinum salt solution for preparing the carbon-supported ultra-low platinum catalytic electrode through displacement reaction. The invention has the advantages of simple process and low costs. The prepared carbon-supported ultra-low platinum catalytic electrode has the advantages of low platinum loading, high electro-catalytic performance, good dispersion of platinum nano-particles and controllable sizes, and can replace the existing commercial platinum carbon (Pt / C) catalyst.

Description

1. Technical field: [0001] The invention belongs to the technical field of fuel cells, in particular to a method for preparing carbon-supported ultra-low platinum catalytic electrodes by indirect electrodeposition. 2. Background technology: [0002] As the most efficient device for converting chemical energy into electrical energy, the proton exchange membrane fuel cell (PEMFC) is on the eve of commercialization. However, the high cost has always been the core problem that plagues its commercialization, and its high cost mainly comes from the extensive use of platinum as an electrocatalyst. Due to the high price of platinum and the scarcity of resources, it is of great significance to reduce the amount of platinum used in PEMFC when no non-precious metal catalysts with catalytic performance and stability comparable to platinum have been found. The U.S. Department of Energy has controlled the anode platinum loading in the 50kW PEMFC stack to 0.05mg / cm 2 The following is lis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M4/88
CPCY02E60/50
Inventor 魏子栋廖明佳季孟波陈四国李莉
Owner CHONGQING UNIV
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