Nanoparticle-graphene-foamed nickel composite material with bionic structure, and preparation method thereof

Abstract

The invention discloses a nanoparticle-graphene-foamed nickel composite material with a skeleton-skin-hair bionic structure. Foamed nickel plays a role in skeleton, graphene plays a role in skin, nanoparticles play a role in hair, the macroscopic morphology of the composite material is block-shaped, and the nanoparticles are CoNiP nanoparticles and are of a nano-lamellar structure. A preparation method of the composite material comprises the following steps: 1) preparing a graphene-foamed nickel composite carrier with a skeleton-skin structure; 2) preparing a graphene-foamed nickel loaded CoNiprecursor; and 3) carrying out phosphating treatment on the graphene-foamed nickel loaded CoNi precursor. The composite material is used as a catalyst for hydrogen production by hydroboron hydrolysis, the maximum hydrogen production rate is 6681.34 mL.min<-1>g<-1>, the hydrogen desorption amount is 100% of a theoretical value, the activation energy Ea is 31.2 kJ.mol<-1>, the effects of producinghydrogen as required and immediately controlling the start and stop of the reaction can be achieved, and 74.8% of the initial catalytic activity is still retained after 15 times of recovery / reuse.

Description

technical field [0001] The invention relates to the technical field of hydrogen production by catalytic hydrolysis of sodium borohydride, in particular to a nanoparticle-graphene-foam nickel composite material with a bionic structure and a preparation method thereof. Background technique [0002] With the depletion of global energy resources and a series of environmental problems caused by the extensive use of fossil energy, it is urgent to find sustainable green energy. Hydrogen energy, as a pollution-free and clean secondary energy source, is the top priority of current energy science research. However, hydrogen storage and preparation technology is still a key technology restricting the commercial application of hydrogen energy. Among the current hydrogen storage methods, metal hydride hydrogen storage has become a research hotspot in the field of hydrogen storage at home and abroad because of its high hydrogen storage efficiency, simple reaction conditions, easy control...

AI Technical Summary

Problems solved by technology

[0013] 1. In common reduction methods, the distribution of reduced metal particles is uneven, and agglomeration is easy to occur;

[0014] 2. The carrier adhesion of general carrier-loaded particles is low;

[0015] 3. The catalyst with two-dimensional structure is easy to accumulate and has a low effective surface area;

[0016] 4. Conventional recovery methods have low recovery rate and poor cycle performance

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