BRACK, P. ... et al, 2015. An old solution to a new problem? Hydrogen generation by the reaction of ferrosilicon with aqueous sodium hydroxide solutions. Energy Science and Engineering, 3 (6), pp.535-540
The chemical hydrogen storage properties of ferrosilicon were investigated. A
hydrogen yield of ~4.75 wt.% (with respect to the mass of ferrosilicon) was
estimated by the reaction of varying quantities of ferrosilicon with 5 mL of 40 wt.%
sodium hydroxide solution. The reaction of ferrosilicon with aqueous sodium
hydroxide solution to form hydrogen was found to have an activation energy of
90.5 kJ mol
by means of an Arrhenius plot. It was observed that the induction
period of the hydrogen generation reaction varies exponentially with temperature.
Although this combination of high activation energy and a lengthy induction
period at low temperatures reduces the attractiveness of ferrosilicon for portable
hydrogen storage applications unless methods can be developed to accelerate the
onset and rate of hydrogen generation, its low cost and widespread availability
make it attractive for further studies focused on higher temperature stationary
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The authors would like to thank the
Engineering and Physical Sciences Research
Council (EPSRC) and Intelligent Energy Ltd for
funding this project.