PtM/C electrocatalyst for fuel cell and preparation method of PtM/C electrocatalyst for fuel cell

Abstract

The invention relates to a PtM / C electrocatalyst for a fuel cell. The PtM / C electrocatalyst comprises the following components by mass percent: 18.16-36.52% of active components, 1.74-3.68% of auxiliary agents and the balance being a conductive carrier. The PtM / C electrocatalyst is prepared by the steps of feeding precursors of the active components and precursors of the auxiliary agents into a mixed suspension liquid of the conductive carrier and a reducing agent in one step; loading metal Pt and M onto the conductive carrier by adopting a pulse microwave-assisted chemical reduction method; and after that, precipitating, filtering, washing and carrying out vacuum drying to obtain the PtM / C electrocatalyst. Compared with the prior art, the preparation method is simple; the prepared PtM / C electrocatalyst is uniform in particle distribution, small in size and high in catalytic activity of oxygen reduction reaction, and can be used in the field of the fuel cell.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and relates to a catalyst and a preparation method thereof, in particular to a PtM / C electrocatalyst for a fuel cell and a preparation method thereof. Background technique [0002] Because the proton exchange membrane fuel cell (PEMFC) has the characteristics of high energy conversion efficiency, easy start-up, and low environmental pollution, it can be used as a power source for electric vehicles, a distributed power station, and a portable mobile power source. Its key technologies have also been developed rapidly. [0003] As we all know, catalyst is the key material of PEMFC, research and development of catalyst with high activity and good stability plays a decisive role in improving the performance of fuel cell. In order to be suitable for commercial mass production, the preparation method of PtM / C catalyst needs to be improved. In the past, the preparation method of PtM / C catalyst was mo...

AI Technical Summary

Problems solved by technology

In order to be suitable for commercial mass production, the preparation method of PtM / C catalyst needs to be improved. In the past, the preparation method of PtM / C catalyst was mostly prepared by impregnation method, liquid phase reduction method and colloid method. However, these methods have different degrees of limitations. technical flaw

For example, the liquid-phase reduction method generally uses a reducing agent to reduce the active component of the catalyst at a certain temperature, and then load it on a carbon carrier. This method usually uses traditional convective heating, which has disadvantages such as uneven heating and slow reaction rate; The catalyst prepared by the impregnation method has a large particle size and poor particle size distribution uniformity. The metal loading capacity cannot be too high, and multiple impregnations are required; while the colloid method has a long preparation period and the process is not easy to control

Images