Catalyst modified by proton conductor and using conductive polymer as carrier and preparation method thereof

Abstract

The invention relates to a catalyst modified by a proton conductor and using a conductive polymer as a carrier and a preparation method thereof. The preparation method comprises the following steps of: adding conductive proton polymer solution into a mixed liquor of alcohol and water and adding salt solution of a metal precursor in the catalyst to prepare metal nano colloid modified by the conductive proton polymer; adding conductive polymer monomers into the prepared colloid; adding acid solution of protons until pH is less than 3; adding a polymerization initiator of the conductive polymer monomers to polymerize the monomers; and adding a carbon material, and mixing, filtering and drying the mixture to prepare the catalyst. Compared with the conventional Pt / C catalyst, the catalyst has the advantages of dual functions of conducting electricity and conducting the protons, wherein the conductive polymer has good stability and electric conductivity, and can improve binding force between metal particles of the catalyst and a carrier conductive proton polymer when used as a bonding agent; the conductive proton polymer modifying the catalyst particles of the metal can build a proton channel; and the carbon material can optimize water and gas channels and build an electron channel. The catalyst has the advantages of strong antioxidation capacity and improvement on service life.

Description

technical field [0001] The invention relates to a catalyst and its preparation method, which is characterized in that the carrier of the catalyst is a conductive polymer. The invention can be mainly used as a proton exchange membrane fuel cell catalyst, and can also be applied to other industrial catalytic fields. technical background [0002] Proton Exchange Membrane Fuel Cell (PEMFC for short) directly converts the chemical energy stored in fuel and oxidant into electrical energy, without environmental pollution, not limited by the Carnot cycle, and its energy conversion efficiency is much higher than that of a heat engine. Therefore, it has broad application prospects in distributed power stations, electric vehicles and portable power supplies. The core of PEMFC is a membrane electrode composed of a gas diffusion layer, a catalyst layer, and a proton exchange membrane. Among them, the catalyst commonly used in the catalyst layer is a carbon-supported platinum-based cata...

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Problems solved by technology

This is because a large number of platinum or platinum alloy particles are deposited in the micropores of porous carbon black, which cannot contact the proton conductor, so it is not conducive to the formation of more three-phase reaction zones

In addition, the electrochemical stability of carbon black is poor, and the electrochemical environment inside the fuel cell is relatively harsh, which makes carbon black prone to electrochemical corrosion and promotes the loss or agglomeration of platinum or platinum alloy particles.

Moreover, the mechanical strength of carbon black is not high

These limit the application of Pt-based catalysts in fuel cells

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