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Direct methanol fuel battery anode catalyst and method for producing the same

A methanol fuel cell and catalyst technology, applied in the direction of catalyst activation/preparation, battery electrodes, chemical instruments and methods, etc., can solve the problems of reducing battery coulombic efficiency and voltage efficiency, cumbersome operation, catalyst poisoning, etc., and achieve easy control and process Simple, low-cost preparation effects

Inactive Publication Date: 2008-04-16
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that it is more cumbersome to operate
Methanol oxidation intermediates can poison the catalyst, severely reducing the Coulombic and voltage efficiencies of the cell

Method used

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  • Direct methanol fuel battery anode catalyst and method for producing the same
  • Direct methanol fuel battery anode catalyst and method for producing the same
  • Direct methanol fuel battery anode catalyst and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]Dissolve chloroplatinic acid and sodium tungstate in 2mol / L sulfuric acid at a molar ratio of 1:40, freshly make a uniform light yellow sol I and freshly prepare chloroplatinic acid with the same molar concentration as the light yellow sol and dissolve in 2mol / L sulfuric acid solution II. The glassy carbon electrode should be pretreated before electrodepositing the catalyst, using 5# metallographic sandpaper and 0.5μm Al 2 o 3 The polishing powder is polished, rinsed with double distilled water, then immersed in double distilled water and cleaned with ultrasonic waves, at 0.5mol / L H 2 SO 4 40 cyclic voltammetry scanning activation in the solution neutralization range of -0.2V ~ 0.9V, the scanning speed is 50mVs -1 .

[0031] Then place the pretreated glassy carbon electrode in the above-mentioned sol I and chloroplatinic acid sulfuric acid solution II respectively, and electrodeposit at a constant -0.1V for 2000s to obtain a composite catalyst Pt-WO evenly dispersed ...

Embodiment 2

[0036] This embodiment is the same as Embodiment 1 except for the following features: electrodeposition at a constant -0.2V for 1000s, using carbon nanotubes instead of glassy carbon electrodes.

Embodiment 3

[0038] This embodiment is the same as Embodiment 1 except for the following features: constant 0.1V electrodeposition for 3000s, using activated carbon instead of glassy carbon electrode.

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Abstract

The present invention discloses a direct methanol fuel cell anode catalyst, in particular to a platinum-based compound catalyst; the basic structure is Pt-WO 3. The method of preparing the catalyst is as follows: mixed sol of H 2 SO 4, H 2 PtCl 6 and Na 2 WO 4 with a certain concentration is electrodeposited by positioning a certain electric potential on a carbon material to prepare the platinum-based compound catalyst with the basic structure: Pt-WO3. The catalyst of the invention improves activity of catalyzing methanol to oxide and has good stability; the doping of auxiliary catalyst WO3 improves the utility ratio of Pt; the invention also improves the catalytic activity of catalyzing CH3OH to oxide; the method of depositing and preparing catalyst is simple in technique, convenient in operation and easy in control; the catalyst can be electrodeposited in the condition of room temperature, thereby the preparation cost of the catalyst is low.

Description

technical field [0001] The invention belongs to the technical field of battery anode catalysts, in particular to a direct methanol fuel cell anode catalyst and a preparation method thereof. Background technique [0002] Direct methanol fuel cells (DMFC) use methanol (CH 3 OH) is the negative electrode reactant, and air is the positive electrode reactant. Methanol is oxidized under the catalysis of the negative electrode catalyst of the battery to release electrons, carbon dioxide and protons (H + ). CO 2 released into the atmosphere, H + The electrons reach the positive electrode of the battery through the proton exchange membrane, and the electrons drive the load to do work through the external circuit. It also flows to the positive electrode of the battery. Under the catalysis of the positive electrode catalyst, the oxygen in the air captures the electrons arriving through the external circuit and combines with the H from the exchange membrane. + Combine to form wate...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/92B01J23/42B01J23/652B01J37/00H01M4/88
CPCY02E60/50
Inventor 黄幼菊戴宏海李伟善
Owner SOUTH CHINA NORMAL UNIVERSITY
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