Anode catalyst for direct methanol fuel battery and method for making same

A methanol fuel cell and catalyst technology, applied in battery electrodes, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of expensive catalysts, easy poisoning of catalysts, and high price, and achieve strong anti-CO poisoning ability, The effect of stable product quality and controllable structure

Inactive Publication Date: 2006-11-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although DMFC has broad development prospects and attractive application markets, there are still some technical problems restricting the application and development of DMFC.
For example, the currently used perfluorosulfonic acid proton exchange membrane (Nafion membrane) has poor alcohol resistance, and when it is used in DMFC, there will be serious alcohol penetration phenomenon, and the currently used Pt catalyst is easily poisoned by the intermediate product CO produced in the reaction process. and expensive
More specifically, the catalysts used in DMFC mainly have the following three problems: the electrocatalytic activity of the catalyst is not high, the catalyst is easily poisoned and the catalyst is expensive.
However, in the above-mentioned catalysts, the intermediate products such as CO produced during the oxidation of methanol will be strongly adsorbed on the surface of the catalyst, occupying the reactive sites on the surface of the catalyst, making it difficult to be desorbed, resulting in a gap between the catalyst and the reactants. The connection of the catalyst is cut off, so that the catalytic efficiency of the catalyst is reduced, and the problem of catalyst poisoning occurs
In addition, both Pt and Ru are rare metals, and resources are scarce and expensive, which is not conducive to the large-scale commercial production of DMFC.

Method used

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  • Anode catalyst for direct methanol fuel battery and method for making same
  • Anode catalyst for direct methanol fuel battery and method for making same
  • Anode catalyst for direct methanol fuel battery and method for making same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take 100mg of Vulcan XC-72 carbon black, put it into 200ml of isopropanol and deionized water solution with a molar ratio of 1.0:1.0, mix it, and disperse it by ultrasonic vibration at 70°C for 30min until the system becomes ink-like. Then, according to the prepared catalyst Pt: Co: W metal atom molar ratio is Pt: Co: W=1.0: 0.2: 1.0, adding concentration successively is the chloroplatinic acid solution 5.070g, 5wt% CoCl 2 Solution 0.0932g, 5wt% Na 2 WO 4 646mg of the solution was continuously stirred with a stirrer at 70°C for 1.5h. The pH of the system was adjusted to 10 with sodium bicarbonate solution. Then add formaldehyde solution drop by drop until the metal elements are completely reduced. The reduction reaction time is 2.5 hours. Rinse with deionized water and filter with suction until the system does not contain chloride ions, and then put it in a vacuum drying oven at 120 ° C. Dry in vacuum for 8h. The dried product is cooled and taken out, passed through...

Embodiment 2

[0037] Take 100mg of Vulcan XC-72 carbon black, put it into 200ml of isopropanol and deionized water solution with a molar ratio of 1.0:2.5, mix it, and disperse it with ultrasonic vibration at 70°C for 40min until the system becomes ink-like. Then, according to the prepared catalyst, the molar ratio of metal atoms is Pt: Co: W=1.0: 0.6: 0.2. Adding the concentration successively is the chloroplatinic acid solution 2.9600g, 5wt% CoCl 2 Solution 0.1632g, 5wt% Na 2 WO 4 The solution was 75.4mg, and it was continuously stirred with a stirrer at 70°C for 0.5h. The pH of the system was adjusted to 11 with sodium bicarbonate solution. Then add formaldehyde solution drop by drop until the metal elements are completely reduced. The reduction reaction time is 1 hour. Rinse with deionized water and filter with suction until the system does not contain chloride ions, and then put it in a vacuum drying oven at 80°C. Vacuum dried for 24h. The dried product was cooled and taken out, pas...

Embodiment 3

[0040] Take 100mg of Vulcan XC-72 carbon black, put it into 200ml of isopropanol and deionized water solution with a molar ratio of 1.0:4.0, mix, and disperse with ultrasonic vibration at 70°C for 50min until the system becomes ink-like. Then, according to the standard that metal atomic ratio is Pt in the prepared catalyst: Co: W=1.0: 0.5: 0.5, add the CoCl that concentration is the chloroplatinic acid solution 9.68g of 1wt%, 5wt% successively 2 0.4550g solution, 5wt% Na 2 WO 4 616.5 mg of the solution was continuously stirred with a stirrer for 2.5 h at 70°C. The pH of the system was adjusted to 10 with sodium bicarbonate solution. Then add formaldehyde solution drop by drop until the metal elements are completely reduced. The reduction reaction time is 3 hours. Rinse and filter with a large amount of deionized water until the system does not contain chloride ions, and then put it in a vacuum drying oven at 140 Dry under vacuum for 1 h. The dried product was cooled and ta...

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Abstract

This invention discloses anode catalyst Pt-Co-W / C for methanol fuel cell and preparation method, the liquid phase deposition reduction method, which contains (1), mixing deionized water and isopropyl alcohol according to definite mol ratio and adding carbon black and dispersion, (2), adding suitable chloroplatinic acid, cobalt chloride and sodium tungstate solution in mixed system and adjusting system pH by sodium bicarbonate solution, (3), washing, pumping filtering and drying.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to an anode three-way catalyst for direct methanol fuel cells. The invention also relates to a preparation method of the catalyst. Background technique [0002] A fuel cell is a power generating device that converts chemical energy directly into electrical energy through a chemical reaction. Fuel cells can be divided into alkaline fuel cells, solid oxide fuel cells, molten carbonate fuel cells, phosphoric acid fuel cells and proton exchange membrane fuel cells according to the different electrolytes used. Proton exchange membrane fuel cells (also known as polymer membrane fuel cells) are the fifth generation of fuel cells developed after alkaline fuel cells, solid oxide fuel cells, molten carbonate fuel cells, and phosphoric acid fuel cells. Proton exchange membrane fuel cell (PEMFC) has the advantages of not being limited by the Carnot cycle, high power density, high energy conversion e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/92H01M4/88B01J23/42
CPCY02E60/50
Inventor 周震涛刘文杰
Owner SOUTH CHINA UNIV OF TECH
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