Preparation method for aluminium alloy/borohydride hydrogen-production system

Abstract

The invention relates to a preparation method for an aluminium alloy / borohydride hydrogen-production system. The system employs aluminium powder, a metal hydride and a metal salt as raw materials; aluminium alloy powder is obtained through ball-milling mixing, heating dehydrogenation fusion, cooling condensation and scraping collection, and then is mixed with a borohydride, and the mixture is subjected to tabletting for forming the aluminium alloy / borohydride hydrogen-production system, wherein the metal hydride is one of sodium hydride, calcium hydride, strontium hydride and sodium aluminium hydride, the metal salt is one of chlorine salts or nitrates of nickel, cobalt, iron, palladium, rhodium and platinum, aluminum accounts for 80-98.5% by mole of total aluminium alloy, the hydride accounts for 1-9% by mole of total aluminium alloy, and the metal salt accounts for 0.5-19% by mole. The preparation method is capable of improving the hydrolysis kinetics of aluminium / borohydride, and also improving the unit-mass hydrogen storage value of a hydrogenation system. The prepared aluminium alloy / borohydride hydrogen-production system has the advantages of being high in hydrogen storage value, convenient to carry, safe, reliable and the like, and has wide application prospect on portable hydrogen source application.

Description

technical field [0001] The invention belongs to the technical field of hydrogen preparation, and in particular relates to a preparation method of an aluminum alloy / borohydride hydrogen production system. Background technique [0002] Proton exchange membrane fuel cells have the advantages of high theoretical specific energy, safety, reliability, cleanliness and pollution-free, and are one of the functional power sources for future vehicles and various electronic products. Efficient and safe hydrogen source systems are restricting the promotion and commercialization of proton exchange membrane fuel cells. The key bottleneck of the application. Use borohydride and metals with high hydrogen storage value to produce hydrogen through hydrolysis and supply to fuel cells, so as to realize the supply of hydrogen at any time, effectively solving the safety problems in the fuel cell hydrogen source, hydrogen storage and transportation process . Borohydride (NaBH 4 and BH 3 NH 3 et...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the use of sodium borohydride solution reduces the hydrogen storage value of the hydrogen production system, and the strong alkaline solution will inevitably bring certain follow-up treatment and safety problems to users. Fan(M Q Fan, S Liu, L X Sun , S Wang. Synergistic hydrogen generation from AlLi alloy and solid-state NaBH4activated by CoCl 2 in water for portable fuel cell. Int J Hydrogen Energy, 2012, 37: 4571-4579.) using NiCl 2 Catalytic AlLi / NaBH 4 Composite hydrogen production system, when Al-10wt% Li-15wt% NiCl 2 / NaBH 4 When the mass ratio is 1:1, the hydrogen production efficiency of the system is 100% within 50 minutes of hydrolysis temperature at a hydrolysis temperature of 50°C, and the hydrolysis hydrogen production amount is 1778ml / g

However, the hydrogen production method still exists. When the hydrogen production system is applied on a large scale, there are still AlLi alloy hydrolysis products deposited on the aluminum surface, which reduces the hydrolysis rate of aluminum.