Modified polyol method for preparing Pt/C catalyst

Abstract

The invention relates to a modified polyol method for preparing a Pt / C catalyst, which comprises the following steps of: (1) heating Pt(acac)2 in a diphenyl ether solvent to the temperature of between 80 and 120 DEG C under the protection of N2 gas for dissolving; (2) adding surfactants oleic acid and oleamide serving as stabilizers; (3) adding treated carbon black into solution, and continuouslystirring for 1 to 3 hours to make acetylacetone platinum loaded to the carbon black first; (4) adding polyol serving as a reducing agent with continuous stirring, and heating and refluxing for 0.5 to1 hour to make the acetylacetone platinum fully reduced into platinum; and (5) filtering solution, washing with absolute ethanol for multiple times and performing vacuum drying. The catalyst has highelectro-catalytic activity when used in a hydrogen-oxygen fuel cell. The prepared Pt / C catalyst has the characteristics of small particle size, high dispersibility and uniform particle size distribution; and according to the transmission electron microscope rendering of the Pt / C catalyst prepared by the method, the average particle size is 2.3nm.

Description

technical field [0001] The invention relates to a modulating polyol method for preparing a platinum / carbon catalyst for a proton exchange membrane fuel cell, and belongs to the field of electrochemical catalysis. Background technique [0002] A fuel cell is an efficient and green power generation device that directly converts chemical energy stored in fuel and oxidant into electrical energy. Among them, Proton Exchange Membrane Fuel Cell (PEMFC) has attracted widespread attention due to its high energy density, no corrosion, low operating temperature, and fast start-up, and has become a major research topic in the energy field. [0003] Proton exchange membrane fuel cells usually use oxygen (or air) and hydrogen as the cathode and anode reaction gases respectively. In order to accelerate the electrode reaction rate, it is necessary to prepare gas diffusion electrodes with highly active electrocatalysts. Especially in the cathodic oxygen reduction process, in order to direc...

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Problems solved by technology

There are many chemical synthesis methods of Pt / C catalysts reported at present, including impregnation reduction method, ion exchange method, Bonnemann method, organic colloid method, etc. There are many problems in the preparation of Pt / C catalysts by these traditional methods, such as impregnation reduction method and ion exchange method. The particle size of the catalyst Pt prepared by the method is large, and it is easy to agglomerate; the Bonnemann method has high cost, the preparation process is complicated, and the impurity content of the product is relatively high; the process conditions of the organic colloid method are difficult to control, and the product separation is difficult

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