A nanofiber loaded cobalt-silver alloy material and its preparation method and application

Abstract

The invention discloses a nanofiber-loaded cobalt-silver alloy material, which is prepared by preparing nanofibers by an electrospinning method, preparing cobalt particles by an impregnation chemical reduction method, and then preparing a cobalt-silver alloy by a redox method and loading it on the nanofibers. . The preparation method includes the following steps: 1) Preparing nanofibers by electrospinning method; 2) Preparing cobalt particles by impregnation chemical reduction method; 3) Preparing cobalt-silver alloy by oxidation-reduction method and loading it into nanofibers. When the material of the invention is used as a hydrogen production catalyst for the hydrolysis of ammonia borane, it can complete hydrogen release in 40 minutes with a high hydrogen release rate. Cycle tests show that it has excellent cycle performance. The nanofiber of the present invention exists in a cylindrical form, has a high specific surface area, and has stable properties. The cobalt-silver alloy is uniformly and stably loaded onto the nanofiber, dispersed evenly without agglomeration, and can quickly catalyze the hydrolysis of ammonia borane to produce hydrogen. Therefore, it has broad application prospects in hydrogen production, fuel cells and other fields.

Description

technical field [0001] The invention relates to the technical fields of electrospinning technology and hydrogen production by catalytic hydrolysis of ammonia borane, in particular to a cobalt-silver alloy material supported by nanofibers, a preparation method and application thereof. Background technique [0002] With the rapid development of the economy and the continuous growth of the population, the demand for energy is expanding day by day. Although fossil fuels still occupy a large proportion of the energy structure, fossil fuels are non-renewable resources and cause certain pollution to the environment. The resulting serious energy crisis has become increasingly prominent. The key factor to solve such problems is the development of new renewable low-carbon green energy and its efficient and clean storage and conversion technology. [0003] Hydrogen energy, as a secondary energy source with abundant reserves, high energy density, convenient use, and wide application, h...

AI Technical Summary

Problems solved by technology

[0004] Among the non-precious metal catalysts for hydrogen production by ammonia borane hydrolysis, metal cobalt exhibits good catalytic performance. Yang et al. used in situ synthesis to reduce cobalt and load it on graphene to catalyze hydrogen production by ammonia borane hydrolysis. Pure cobalt particles The dehydrogenation of ammonia borane is completed in 55 minutes by catalyzing hydrogen production from ammonia borane, and the dehydrogenation of ammonia borane catalyzed by the cobalt catalyst supported on graphene is completed in about 10 minutes. This technical solution has the following technical problems: 1) The conditions for preparing graphene oxide are complex and harsh , shared six steps of synthesis; 2) Using a large amount of graphene, the cost is high; 3) After five cycles of the prepared catalyst, the reaction rate drops to 50% of the initial catalysis, and the cycle performance needs to be improved

However, the catalyst prepared by this method released hydrogen after about 90 minutes, and the amount of hydrogen released was not high, and the hydrogen in ammonia borane was not completely released.

In addition, the activity of nanoparticles attached to the surface of nanofibers is low

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