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Metal nano-electrocatalyst for oxygen reduction reaction of fuel cell, preparation method and application thereof

A metal nano, electrocatalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, battery electrodes, chemical instruments and methods, etc., can solve the problems of high price of platinum and limited practical application.

Inactive Publication Date: 2011-12-28
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The metal with excellent electrocatalytic activity for oxygen reduction reaction is metal platinum (Pt), but platinum is an expensive metal, which greatly limits its practical application in fuel cells

Method used

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  • Metal nano-electrocatalyst for oxygen reduction reaction of fuel cell, preparation method and application thereof
  • Metal nano-electrocatalyst for oxygen reduction reaction of fuel cell, preparation method and application thereof
  • Metal nano-electrocatalyst for oxygen reduction reaction of fuel cell, preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] At a concentration of 2 mM H 2 PtCl 6 20 mL of the solution was placed in a hydrothermal reaction kettle, and 1 mL of complexing agent EDTA with a concentration of 40 mM and 5 mg of Vulcan XC-72 carbon powder were added in sequence, and then ultrasonic treatment was performed at room temperature for 5 min, and then the mass percent concentration was added dropwise. 3% NaBH 4 solution 2 ml; then the autoclave was heated to 140 o C and kept for 6 hours; after the reaction was completed, the reactor was cooled to room temperature, the reaction solution was filtered, and the obtained nano-catalyst particles were washed twice with pure water and absolute ethanol successively to obtain a carbon-supported nano-Pt electrocatalyst; the carbon-supported nano- 5 mg of Pt electrocatalyst was mixed with 1 mL of absolute ethanol, 50 mL of Nafion (5% by mass) solution was added, and the mixture was ultrasonically treated for 30 min to form a paste, which was finally added dropwise o...

Embodiment 2

[0029] At a concentration of 5 mM H 2 PtCl 6 20 mL of the solution was placed in a hydrothermal reaction kettle, and 1 mL of complexing agent EDTA with a concentration of 100 mM and 8 mg of Vulcan XC-72 carbon powder were sequentially added, and then ultrasonic treatment was performed at room temperature for 10 min, and then the mass percent concentration was added dropwise. 6% NaBH 4 solution 2 ml; then the reactor was heated to 180 o Keep at C for 8 hours; after the reaction is completed, the reactor is cooled to room temperature, the reaction solution is filtered, and the obtained nano-catalyst particles are washed twice with pure water and absolute ethanol successively to obtain a carbon-supported nano-Pt electrocatalyst; the carbon-supported nano- 5 mg of Pt electrocatalyst was mixed with 1 mL of absolute ethanol, 50 mL of Nafion (5% by mass) solution was added, and the mixture was ultrasonically treated for 30 min to form a paste, which was finally added dropwise on th...

Embodiment 3

[0031] At a concentration of 10 mM H 2 PtCl 6 20 mL of the solution was placed in a hydrothermal reaction kettle, and 1 mL of complexing agent EDTA with a concentration of 200 mM and 12 mg of Vulcan XC-72 carbon powder were added in sequence, and then ultrasonic treatment was performed at room temperature for 20 min, and then the mass percent concentration was added dropwise. 10% NaBH 4 solution 2 ml; then the reactor was heated to 200 oC and kept for 12 hours; after the reaction was completed, the reactor was cooled to room temperature, the reaction solution was filtered, and the obtained nano-catalyst particles were washed twice with pure water and absolute ethanol successively to obtain a carbon-supported nano-Pt electrocatalyst; the carbon-supported nano- 5 mg of Pt electrocatalyst was mixed with 1 mL of absolute ethanol, 50 mL of Nafion (5% by mass) solution was added, and the mixture was ultrasonically treated for 30 min to form a paste, which was finally added dropwis...

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Abstract

A preparation method of a metal nano electro-catalyst for a redox reaction of a fuel cell. A complexing agent of EDTA and a reducing agent of NaBH4 are employed to reduce a mixed solution of H2PtCl6 and powdered carbon or a mixed solution of H2PtCl6 and CoCl2 and NiCl2 and powdered carbon to carbon-loaded metal nano catalyst particles through a one-step hydrothermal method. The catalyst particlesare separated, washed, added with absolute ethyl alcohol and a Nafion solution and dispersed by ultrasonic to a paste, which is pasted on a titanium sheet surface to prepare a corresponding carbon-loaded nano platinum electrode (Pt / C) and a carbon-loaded nano platinum-cobalt-nickel electrode (PtCoNi / C). The ternary platinum-cobalt-nickel metal nano electro-catalyst of the invention has an obviously decreased platinum content, but an initial potential and a current density of a redox reaction much higher than those of a crystal platinum electrode and a Pt / C electrode. The electrode material ofthe present invention not only has excellent catalytic activity to the redox reaction, but also substantially reduces a usage amount of the precious metal platinum; besides the electrode material is simply prepared, has a stable structure and can be widely used in fuel cells.

Description

technical field [0001] The invention belongs to the technical field of fuel cell technology and new energy materials, and specifically relates to a carbon-supported platinum-cobalt-nickel ternary metal nanometer electrocatalyst particle and a preparation method and application thereof. Background technique [0002] Fuel cell is one of the key development directions in the field of new energy. It has the advantages of high efficiency, cleanliness and low noise, and has been highly valued by governments and scientists of various countries. The oxidant used in the fuel cell is generally oxygen, so the oxygen reduction reaction constitutes a very important reaction in the operation of the fuel cell. The metal with excellent electrocatalytic activity for oxygen reduction reaction is metal platinum (Pt), but platinum is an expensive metal, which greatly limits its practical application in fuel cells. Therefore, platinum and other cheap and common metals are used to form metal all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J23/89H01M4/92
CPCY02E60/50
Inventor 易清风左葛琨琨
Owner HUNAN UNIV OF SCI & TECH
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