Nano-fiber supported cobalt-silver alloy material as well as preparation method and application thereof

Abstract

The invention discloses a nano-fiber supported cobalt-silver alloy material. Nano-fiber is prepared with an electrostatic spinning method, cobalt particles are prepared with an impregnation chemical reduction method, a cobalt-silver alloy is prepared with an oxidation reduction method and supported on the nano-fiber, and the nano-fiber supported cobalt-silver alloy material is obtained. The preparation method of the nano-fiber supported cobalt-silver alloy material comprises steps as follows: 1) the nano-fiber is prepared with the electrostatic spinning method; 2) the cobalt particles are firstly prepared with the impregnation chemical reduction method; 3) the cobalt-silver alloy is prepared with the oxidation reduction method and supported on the nano-fiber. When the material is used as a catalyst for preparation of hydrogen through ammonia borane hydrolysis, hydrogen desorption is completed in 40 min, the hydrogen desorption rate is high, cycle tests indicate that the material has good cycle performance. The nano-fiber exists in the form of a cylindrical shape and has a high specific surface area and stable properties, the cobalt-silver alloy is uniformly and stably supported on the nano-fiber, is uniformly dispersed, does not agglomerate and can quickly catalyze ammonia borane to be hydrolyzed for hydrogen preparation, and accordingly, the material has broad application prospects in hydrogen preparation, 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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