Core-shell structure catalyst for fuel cells and its pulse electrodeposition preparation method

Abstract

The invention discloses a core-shell structure catalyst for fuel cells and its pulse electrodeposition preparation method. The active component of the catalyst is a nanoparticle with a core-shell structure, and an active metal is cladded in the form of an ultrathin shell on the surface of a carbon carrier loaded metal or alloy nanoparticle serving as a core. The catalyst takes a non-platinum noble metal or transition metal as the core, and adopts more than one of Pt, Ir or Au as the shell. The preparation method includes: preparation of the nanoparticle serving as the core, making of a working electrode for pulse electrodeposition, and preparation of the catalyst by pulse electrodeposition. The catalyst can be used as an anode or cathode catalyst of a low temperature fuel cell. The obtained catalyst has very high stability. Compared with underpotential deposition, the method is simple to operate, has no need for inert atmosphere protection, and is more suitable for large-scale industrial production, also can greatly reduce the noble metal consumption of fuel cells, and greatly reduce the cost of fuel cells, thus having great significance in promoting the commercialization process of fuel cells.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a catalyst material with a core-shell structure for a fuel cell and a preparation method thereof. Background technique [0002] The energy shortage caused by massive burning of fossil fuels, as well as the increasing greenhouse effect and serious air pollution caused by massive burning of fossil fuels have forced people to pay more and more attention to exploring new energy sources and new energy conversion technologies. Among the thousands of solutions proposed so far, the proton exchange membrane fuel cell is considered to be a green and environmentally friendly new technology that is most likely to be applied in the short term, due to its high energy conversion efficiency and environmental friendliness , high energy density and other advantages have received extensive attention. Over the past ten years, fuel cell technology has made great breakthroughs in materials, equipment and te...

AI Technical Summary

Problems solved by technology

This method reduces the amount of precious metals to a certain extent and improves the utilization rate of precious metals. However, the particles are very large. It can be seen from the electron microscope that they are about 100 nm. Larger particles are not conducive to shell precious metals (Pt). The catalytic performance of the core-shell structure catalyst prepared by this patent cannot be significantly improved, and the high utilization of shell noble metals cannot be achieved.

And this patent, like the aforementioned two patents, fails to provide electron microscope images or other information proving that the catalyst particles obtained by this method have a "core-shell" structure

[0010]In a word, in the prior art, it has not been found that the pulse electrodeposition method is used to deposit an active shell layer on the surface of relatively cheap nanoparticles to prepare a particle size within 10 nm. Patent Report on Core-Shell Structured Catalysts Suitable for Fuel Cells

Images