Method for preparing direct methanol fuel cell carbon-carried Pt-based catalyst

Abstract

The invention discloses a method for preparing a carbon-supported Pt-based catalyst of direct methanol fuel cells. The method comprises the following steps: carbon carriers are dispersed in secondary distilled water; Pt or an aqueous solution of the Pt and other metallic compounds is added to the secondary distilled water and then is subjected to ultrasonic dispersion; solvent water is volatilized through magnetic stirring at a temperature between 60 and 90 DEG C, so as to obtain a dry powder body; and the dry powder body is dispersed by use of glycol, added with a reducing agent at a temperature between 30 and 60 DEG C and reduced, so as to obtain the carbon-supported Pt or Pt-based catalyst. The method has the advantages of simple operation; as the glycol can be used as a solvent as well as a protective agent, the preparation process of the catalyst needs no surfactant, stabilizer, functional molecule and the like; and the method is suitable for industrial scale production.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a method for preparing a carbon-supported Pt-based catalyst for a direct methanol fuel cell. Background technique [0002] Direct methanol fuel cell (DMFC) directly uses methanol as fuel without reforming to obtain hydrogen-rich fuel gas. Methanol has the advantages of abundant sources, cheap price, low toxicity, easy to carry and store, and has high electrocatalytic active. However, the development of direct methanol fuel cells has been troubled by two key problems for a long time: (1) the electrocatalytic performance of the anode for methanol is poor; (2) the permeation of methanol degrades the performance of the cathode. It can be seen that the development of efficient anode electrocatalysts is one of the problems that must be solved in the field of direct methanol fuel cells. So far, Pt-based metal catalysts are mainly able to adsorb and catalyze methanol oxidation at lower temper...

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Problems solved by technology

At present, the preparation methods of this kind of catalyst mainly include impregnation reduction method and sol method: (1) impregnation reduction method is to disperse the carrier evenly in a certain solvent such as water, ethanol, isopropanol or a mixture thereof, and select to add a certain precious metal precursor Such as chloroplatinic acid (H 2 PtCl 6 ·H 2 O) or ruthenium trichloride (RuCl 3 ) impregnated into the pores of the carrier, adjusted to a suitable pH value, at a certain temperature with an excess reducing agent such as HCHO, NaBH 4 , ethylene glycol, H 2 etc. are reduced to obtain the required supported catalyst, but the catalyst prepared by this method may cause the particle size to be too large due to agglomeration, which reduces catalyst performance (NaBH 4 and other solutions are reducing agents), or because the reaction temperature is too high, the danger increases (H 2 (2) the colloid method is to prepare the noble metal precursor of the catalyst as a metal colloid in a specific solvent, and then adsorb or deposit it on the carrier; or form a specific noble metal oxide colloid, then reduce and At the same time, it is adsorbed on the carrier to prepare a carrier-metal catalyst. However, this method is complicated to operate and the reaction conditions are relatively harsh. Usually, it is necessary to install a reflux device and pass N 2 protection, the reaction temperature is above 130°C

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