Method and device for preparing homogeneous catalyst slurry with controllable concentration

Abstract

The invention provides a method and a device for preparing a homogeneous catalyst slurry with controllable concentration. The preparation method comprises: (1) stirring a catalyst in a vacuum container until the catalyst completely flies up and is in a flying dust state; (2) injecting water mist into the container to fully wet the catalyst; (3) injecting a preset ingredient into the container, anduniformly mixing with the catalyst to obtain a slurry; and (4) homogenizing the slurry. According to the invention, in the oxygen-free vacuum container, the combination of the catalyst and the atomized water is firstly completed to achieve the wetting of the catalyst, so that the oxidation of the catalyst is avoided; and in the process of the uniformly mixing of other auxiliary materials and thecatalyst, the volatilization loss does not easily occur, such that the stability of the slurry concentration is realized so as to ensure the homogenization of the catalyst.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a preparation method and device for homogeneous catalyst slurry with controllable concentration. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) has the advantages of high power density, low temperature operation, clean and non-polluting. Membrane electrode (MEA) is the most important component of PEMFC. It is not only an important place for electron generation and separation, but also carries the transmission of gas and product water, which has a very important impact on the electrochemical performance of PEMFC. [0003] The preparation method of MEA can be divided into the traditional gas diffusion electrode (GDE) method and the catalyst coated membrane (CCM) method according to the different coating positions of the catalyst slurry. In the GDE method, the catalyst in the slurry is generally prepared on the gas diffusion layer by coating,...

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Problems solved by technology

[0006] The catalyst required for the preparation of membrane electrodes has high activity, and when directly exposed to the air, an oxidation reaction that is not easily found by the naked eye may occur, resulting in the catalyst being partially oxidized and losing a certain catalytic activity; in addition, although the slurry is dispersed, the first The first step is to add a certain amount of deionized water to the catalyst particles, mainly to prevent the catalyst particles from undergoing a high probability of oxidation reaction due to contact with organic solvents in the air atmosphere, and even spontaneous combustion in extreme cases. However, simply Dropping a certain amount of deionized water on the surface of the catalyst particles cannot completely ensure that all the catalyst particles are wetted by water to achieve the effect of isolating the air. The wetted catalyst is oxidized, resulting in partial deactivation of the catalyst; in addition, in the conventional dispersion device, the catalyst slurry and the slurry container are directly connected to the air, and the volatile organic solvent in the slurry will be partially volatilized during the dispersion process , resulting in a change in the concentration of the slurry, that is, the concentration is uncontrollable, which directly leads to the uncontrollable catalyst loading in the membrane electrode, and the performance and consistency of the membrane electrode cannot be guaranteed.

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