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materials [11]. An alternative to hydrogen production by electrolysis is the production of hydrogen during sodium metal dissolution in concentrated aqueous Epsom salt solution [12]. Different technologies for the large-scale storage of hydrogen are reviewed by Andersson and GroĢnkvist [13]. This article presents data for a 0.25 M Epsom salt solution and compares the data for different molarities. 1.1 Experimental Procedure The experiment described by Fanchi1uses a 0.12 M Epsom salt-water solution. This experiment uses a 0.25 M Epsom salt-water solution. Fig. 1 shows the HyPIR electrolysis apparatus used in this experiment. The Epsom salt (magnesium sulfate) solution in an electrolytic cell is electrolyzed with a copper anode to form copper sulfate, magnesium hydroxide, and hydrogen. The hydrogen is captured by a seal and forms a gas cap that increases the pressure in the cell. The increase in pressure is measured by a manometer. The rate of production of hydrogen gas is measured by recording the rate at which the fluid level rises in the manometer due to the pressure increase in the electrolytic cell. The experiment was conducted at room temperature. The Erbium-YAG laser [14,15] selected for this experiment provides a beam of light with a wavelength of 2.94 microns. The Erbium-YAG laser was chosen because the photon energy at this wavelength is readily absorbed by the symmetric stretch vibrational mode of water at 2.734 microns wavelength and the asymmetric stretch vibrational mode of water at 2.662 microns wavelength. These vibrational modes refer to the stretching of the hydrogen-oxygen bond in water. The laser beam provided 600 mJ energy per pulse at a pulse rate of 4 Hz [15]. In this article we compare HyPIR electrolysis results for two different molarities. 1.2 Experimental Results Fig. 2 shows the results of HyPIR electrolysis for 40 ml of a 0.25 M solution of Epsom salt in water. The experimental results show that the rate of change of fluid level (y in the regression equation) has a linear dependence on DC voltage (x in the regression equation) for the voltage range covered by the experiments. The slope of the lines represents the hydrogen production rate. The percent increase in hydrogen production rate is defined as 100% x (HIR - H0)/H0 where HIR is the rate of hydrogen production by electrolysis with the infrared laser beam, and H0 is the rate of hydrogen production by electrolysis without the laser. The percent increases in hydrogen production rate for a 0.12 M solution and a 0.25 M solution are compared in Fig. 3. 2. DISCUSSION Fig. 3 shows that the increase in molarity results in a decrease in hydrogen production rate associated with IR laser irradiation. The purpose of IR laser irradiation was to stretch the hydrogen-oxygen bond and make it easier to dissociate the hydrogen and oxygen atoms. The increase in molarity increases the presence of ions in solution and appears to decrease the effectiveness of IR laser irradiation. It should be noted that the increase in DC voltage in the electrolytic cell also appears to decrease the effectiveness of IR laser irradiation. Fanchi; AJR2P, 4(2): 1-5, 2021; Article no.AJR2P.65706 Fig. 1. HyPIR Electrolysis apparatus (courtesy Fanchi Enterprises) 2PDF Image | HyPIR Electrolysis 25 M Epsom Salt Solution
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