Method for preparing anode catalyst of direct methanol fuel cell

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 high mass production cost of catalysts, easily poisoned methanol, and low working temperature, and achieve good methanol oxidation Catalytic activity, improved resistance to CO poisoning, and improved surface properties

Inactive Publication Date: 2007-07-25
XIAMEN UNIV
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AI Technical Summary

Problems solved by technology

[0003] Direct Methanol Fuel Cell (DMFC) is a power generation device that directly converts the chemical energy of fuel (methanol) and oxidant (air or oxygen) into electrical energy. It has high energy density and power density and low operating temperature. Advantages, but there are also disadvantages such as high cost, easy poisoning and easy penetration of methanol
At present, the main problems of DMFC are: 1) The electrocatalytic oxidation rate of fuel methanol is slow at room temperature, the noble metal electrocatalyst is easily poisoned by carbon monoxide (CO) intermediate products, and the current density is low
2) Precious metals are expensive, and the mass production cost of catalysts is too high
4) The water and heat management is complicated, and the service life is not ideal
However, almost all the reports on the preparation of PANI / MWNT composites by chemical in-situ polymerization have considered the electrical conductivity, mechanics, photoelectricity and other properties of the composites, and most of them are based on polymers, and carbon nanotubes are dispersed as "fillers". The polymer network plays a role in enhancing and improving the conductivity, and none of the composites prepared by this method are used as supports for platinum-based catalysts in direct methanol fuel cells (DMFC).

Method used

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  • Method for preparing anode catalyst of direct methanol fuel cell
  • Method for preparing anode catalyst of direct methanol fuel cell

Examples

Experimental program
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Embodiment 1

[0039] (1) Preparation of composite carrier: take a single-necked flask as a reaction vessel, first add 100ml of 1mol / L sulfuric acid solution containing 0.1g of polyvinyl alcohol, add 0.1gMWNT, ultrasonically shake at room temperature for 4h, then add 0.067gANI, and then slowly drop Add 2.4 times the amount of aniline ammonium persulfate (APS) solution. Reaction at 0°C for 8h. Wash, tumble dry, and set aside. The SEM images of the polyaniline / multi-walled carbon nanotube composite carrier and the multi-walled carbon nanotube carrier are shown in Figure 1, where a is the SEM image of the polyaniline / multi-walled carbon nanotube composite carrier, and b is the multi-walled carbon nanotube carrier SEM image. The FTIR diagram of the polyaniline / multi-walled carbon nanotube composite carrier and the multi-walled carbon nanotube carrier is shown in Figure 2, where curve a is the FTIR diagram of the polyaniline / multi-walled carbon nanotube composite carrier, and curve b is the mul...

Embodiment 2～5

[0044] Examples 2-5: The input amount of ANI and MWNT, the amount of polyvinyl alcohol used in the preparation process of the PANI / MWNT composite carrier and the amount of chloroplatinic acid used in the platinum deposition process were changed, and other conditions were kept unchanged, see Table 1.

[0045] Table 1

[0046] Example

Embodiment 6

[0048] (1) Preparation of the composite carrier: take a single-necked flask as the reaction vessel, first add 100ml of 1mol / L sulfuric acid solution containing 0.1g of polyethylene glycol octylphenyl ether, add 0.1g of MWNT, ultrasonically shake for 4 hours at room temperature, and then add 0.067gANI, then slowly add dropwise an ammonium persulfate (APS) solution of 2.4 times the amount of aniline. Reaction at 0°C for 8h. Wash, tumble dry, and set aside.

[0049] (2) Take 0.1 g of PANI / MWNT composite carrier powder into a reaction flask, add 100 ml of acetic acid buffer solution (pH=3.5) containing 10% isopropanol, and oscillate ultrasonically for 2 hours until a uniform dispersion system is formed.

[0050] (3) Measure 3.3ml of 0.0386mol / L chloroplatinic acid (H 2 PtCl 6 ) solution in the dispersion, continue to shake for 60min.

[0051] (4) Heat up to 60°C, add excess sodium borohydride solution dropwise, react for 1.5 hours, filter, wash until chloride-free, and dry the...

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Abstract

A process for preparing the anode catalyst Pt/PANI/MWNT able to be directly used for methanol fuel battery includes such steps as adding sulfuric acid solution containing disperser into container, adding multi-wall carbon nanotubes, ultrasonic oscillating, adding phenylamine and ammonium persulfate solution, reacting, washing, baking to obtain polyphenylamine/multi-wall carbon nanotubes carrier, adding additive contained buffering solution of acetic acid, ultrasonic oscillating, adding chloroplatinic acid solution, continuous oscillating while heating and dropping sodium borohydride solution, reacting, filtering, washing and baking.

Description

technical field [0001] The present invention relates to a fuel cell anode catalyst, in particular to a polyaniline / multi-walled carbon nanotube (PANI / MWNT) composite material as a carrier, and a supported catalyst (Pt / PANI / MWNT), and use the supported catalyst as a preparation method of direct methanol fuel cell (DMFC) anode catalyst. Background technique [0002] Plagued by the "energy crisis" and people's increasing emphasis on environmental protection, searching for a new "clean energy" has become a new global topic. Fuel cells are generally regarded as a "green" new type of energy, which is of great significance to improving resource utilization and solving environmental pollution. [0003] Direct Methanol Fuel Cell (DMFC) is a power generation device that directly converts the chemical energy of fuel (methanol) and oxidant (air or oxygen) into electrical energy. It has high energy density and power density and low operating temperature. Advantages, but there are also...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42H01M4/92
CPCY02E60/50
Inventor 戴李宗彭小亮许一婷陈江枫
Owner XIAMEN UNIV
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