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Preparation method of high-efficiency low-platinum catalyst for direct methanol fuel cell

A methanol fuel cell, a direct technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of reducing catalyst stability and catalytic activity, and achieve low platinum loading and methanol catalysis highly active effect

Inactive Publication Date: 2014-07-09
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of efficient low-platinum direct methanol fuel cell catalyst for the deficiencies of the existing direct electrodeposition method and four-step electrodeposition method Preparation
The introduction of amorphous P not only overcomes the problems that Cu, Co, Ni, etc. are easily oxidized and lost during the use of fuel cells, and reduces the stability and catalytic activity of the catalyst, but also the synergistic catalytic effect of P elements can significantly improve the methanol concentration of Pt. Oxidation catalytic activity

Method used

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  • Preparation method of high-efficiency low-platinum catalyst for direct methanol fuel cell
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  • Preparation method of high-efficiency low-platinum catalyst for direct methanol fuel cell

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Effect test

Embodiment 1

[0034] (1), Titanium substrate pretreatment

[0035] The titanium sheet was first mechanically polished, then ultrasonically cleaned with deionized water, acetone, absolute ethanol and deionized water for 10 minutes, and finally dried at 60°C for 30 minutes for use;

[0036] (2) Preparation of Ni-P / Ti precursor electrode by pulse electrodeposition

[0037] A two-electrode system was adopted, the titanium substrate prepared in step (1) was used as the cathode, the platinum wire electrode was used as the anode, the electrolyte was an aqueous solution containing 50 g / L nickel sulfate and 50 g / L sodium hydrogenphosphite, and the electrodeposition temperature was 10 ℃, the pulse peak current density is 30A / dm 2 , the pulse on time is 1ms, the pulse off time is 10ms, and the electrodeposition time is 100s;

[0038] (3) Formation of Pt-Ni-P / Ti electrode by replacement method

[0039] Clean the Ni-P / Ti electrode prepared in step (2) with ultrapure water, then immerse in nitrogen-prot...

Embodiment 2

[0042] Step (1) is the same as step (1) in Example 1;

[0043] (2) Preparation of Ni-P / Ti precursor electrode by pulse electrodeposition

[0044] A two-electrode system was adopted, the titanium substrate prepared in step (1) was used as the cathode, the platinum wire electrode was used as the anode, the electrolyte was an aqueous solution containing 10 g / L nickel nitrate and 100 g / L potassium hydrogen phosphite, and the electrodeposition temperature was 70 ℃, the pulse peak current density is 1A / dm 2 , the pulse on time is 10ms, the pulse off time is 50ms, and the electrodeposition time is 5s;

[0045] (3) Formation of Pt-Ni-P / Ti electrode by replacement method

[0046] After cleaning the Ni-P / Ti electrode prepared in step (2) with ultrapure water, immerse it in the chloroplatinic acid aqueous solution under nitrogen protection for replacement, adjust the pH value of the chloroplatinic acid aqueous solution to 1, and the concentration to 0.1 g / L, Pt-Ni-P / Ti electrode was o...

Embodiment 3

[0050] Step (1) is the same as step (1) in Example 1;

[0051] (2) Preparation of Ni-P / Ti precursor electrode by pulse electrodeposition

[0052] A two-electrode system was adopted, the titanium substrate prepared in step (1) was used as the cathode, the platinum wire electrode was used as the anode, and the electrolyte was an aqueous solution containing 100 g / L nickel chloride and 10 g / L potassium hydrogen phosphite, and the electrodeposition temperature was 40℃, the pulse peak current density is 20A / dm 2 , the pulse on time is 0.1ms, the pulse off time is 1ms, and the electrodeposition time is 300s;

[0053] (3) Formation of Pt-Ni-P / Ti electrode by replacement method

[0054] After cleaning the Ni-P / Ti electrode prepared in step (2) with ultrapure water, immerse it in the chloroplatinic acid aqueous solution under nitrogen protection for replacement, adjust the pH value of the chloroplatinic acid aqueous solution to 7, and the concentration to 30 g / L, Pt-Ni-P / Ti electrode...

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Abstract

The invention provides a method for preparing a high-efficiency and low-platinum direct methanol fuel cell catalyst, which belongs to the technical field of fuel cells. The present invention first adopts the method of pulse electrodeposition to deposit a layer of nanoscale Ni-P amorphous alloy on the titanium substrate, which has strong corrosion resistance and has a certain auxiliary catalytic effect on methanol oxidation, as a "core / shell" The "core" of the catalyst; then, through the chemical replacement reaction, a completely replaced platinum monoatomic layer is formed on the surface of the Ni-P amorphous alloy, thereby constructing a "core / shell"-like low-carbon catalyst with a synergistic catalytic effect on methanol oxidation. Platinum fuel cell catalyst. The method of the invention is simple and easy, and the production cost is low. The catalyst prepared by the invention can effectively reduce the amount of precious metals and improve the utilization rate of the catalyst, and can replace the existing commercial platinum carbon (Pt / C) catalyst, and is widely used in electric vehicles, various spacecraft, portable electronic equipment, Such as video cameras, notebook computers, electric toys, etc.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a preparation method of a high-efficiency and low-platinum direct methanol fuel cell catalyst. Background technique [0002] Direct methanol fuel cells (DMFCs) are devices that directly convert chemical energy into electrical energy using liquid methanol as fuel. DMFC has the advantages of high energy conversion efficiency, no pollution, no noise, simple system structure, high energy density, and convenient fuel carrying and replenishment. It is an ideal power supply for electronic products, communication equipment, and various portable equipment. At present, the precious metal Pt and its alloys are still the best anodic oxidation catalysts for organic small molecules such as methanol, but due to the high price of Pt, limited resource reserves, and the strong adsorption of CO intermediates generated during the oxidation of methanol on the surface of Pt to form Pt-C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01J37/34H01M4/92
CPCY02E60/50
Inventor 魏子栋陶熊新陈四国戚孝天王俊
Owner CHONGQING UNIV
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