The process by which hydrogen is prepared by the reaction of silicon,iron alloy and NaoH,is
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sodium hydroxide solution and ferrosilicon
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SUMMARY
For the first time, the process of hydrogen evolution from ferrosilicon 75 using sodium hydroxide solution has been
investigated as a function of temperature using a combination of X-ray photoelectron spectroscopy, X-ray diffraction and physical measurements. Ferrosilicon 75, a mixture of silicon (~50 wt.%) and iron disilicide (~50 wt.%), has been shown to produce
hydrogen by the action of sodium hydroxide solution on the silicon only, with the iron disilicide acting in the role of
spectator/protector species for the silicon. Neither iron disilicide alone nor ferrosilicon 45, which does not contain a pure metallic silicon phase, was found to generate hydrogen under similar reaction conditions, further indicating that the presence of a
pure metallic silicon phase is essential for hydrogen generation. As the iron disilicide acts as a diluent for the active silicon, it is
hypothesized that this would result in a slower release of hydrogen than that which would be obtained from the reaction of
silicon alone, which may be useful for applications which require a long-term, sustained release of hydrogen. A hydrogen yield
of 462.5 mL/g and a maximum hydrogen generation rate of 83 mL/min g were obtained within 10 min of reaction with 40 wt.%
NaOH at 348 K. © 2017 The Authors. International Journal of Energy Research Published by John Wiley & Sons Ltd
For the first time, the process of hydrogen evolution from ferrosilicon 75 using sodium hydroxide solution has been
investigated as a function of temperature using a combination of X-ray photoelectron spectroscopy, X-ray diffraction and physical measurements. Ferrosilicon 75, a mixture of silicon (~50 wt.%) and iron disilicide (~50 wt.%), has been shown to produce
hydrogen by the action of sodium hydroxide solution on the silicon only, with the iron disilicide acting in the role of
spectator/protector species for the silicon. Neither iron disilicide alone nor ferrosilicon 45, which does not contain a pure metallic silicon phase, was found to generate hydrogen under similar reaction conditions, further indicating that the presence of a
pure metallic silicon phase is essential for hydrogen generation. As the iron disilicide acts as a diluent for the active silicon, it is
hypothesized that this would result in a slower release of hydrogen than that which would be obtained from the reaction of
silicon alone, which may be useful for applications which require a long-term, sustained release of hydrogen. A hydrogen yield
of 462.5 mL/g and a maximum hydrogen generation rate of 83 mL/min g were obtained within 10 min of reaction with 40 wt.%
NaOH at 348 K. © 2017 The Authors. International Journal of Energy Research Published by John Wiley & Sons Ltd
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