Optimization of hydrogen production by water electrolysis

Recently, hydrogen has been considered as a future energy carrier. Hydrogen is believed to be the most important long-term option for addressing the energy, environmental and economic concerns since it is a renewable and clean energy resource. The simplest and cheapest way to produce hydrogen is by...

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Main Author:	Azni, Siti Radhiana
Format:	Thesis
Language:	English
Published:	2014
Subjects:	QC Physics
Online Access:	http://eprints.utm.my/id/eprint/50789/25/SitiRadhianaAzniMFS2014.pdf
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spelling	my-utm-ep.507892020-07-12T05:42:41Z Optimization of hydrogen production by water electrolysis 2014-09 Azni, Siti Radhiana QC Physics Recently, hydrogen has been considered as a future energy carrier. Hydrogen is believed to be the most important long-term option for addressing the energy, environmental and economic concerns since it is a renewable and clean energy resource. The simplest and cheapest way to produce hydrogen is by electrolysis. However, the process is inefficient. Therefore the objective of this study is to enhance the hydrogen production by optimizing the electrolysis parameters as well as the laser parameters. In this study, fixed volume of distilled water was employed as medium and sodium chloride used as catalyst. Graphite rods were used as electrodes which were supplied by varying voltage. Molybdenum sheets with various surface areas were utilized as a sacrifice agent to protect the cathode. Meanwhile, ethanol solution was used to compensate oxidation by donating an amount of electron in the electrolyte was deployed as supplement. Hence the electrolyte parameters were optimized by varying the voltage, the sacrifice agents and electron donor. In addition, the hydrogen production was also enhanced by illuminating light into the electrolysis chamber. The light source was also optimized by varying the wavelength and the power of the light. In this study, the light source used comprised of diode-pumped solid state laser at various wavelength including, 485 nm, 532 nm, 635 nm, while nitrogen laser and conventional UV light source were at 337 nm and 403 nm respectively. The results obtained showed that the hydrogen increased with the voltage as well as the sacrifice agent area. The larger the voltage, the more the water splitting and the larger the area of sacrifice agent, the more protection on the cathode. Thus, more hydrogen production was encouraged. In contrast, the addition of the supplementary element ethanol was limited to 7 mL and above 7 mL, it resisted the hydrogen production. In the case of illumination light, green laser at 532 nm had shown a pronounced result. This was due to the light that is transparent to the water, thus contributing to more electric field into the electrolysis system. Furthermore, the higher the power of the green laser into the electrolysis chamber the more hydrogen production was realized. Thus, the effectiveness as well as the efficiency of the hydrogen production do relies on the optimizing parameters. 2014-09 Thesis http://eprints.utm.my/id/eprint/50789/ http://eprints.utm.my/id/eprint/50789/25/SitiRadhianaAzniMFS2014.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:86629 masters Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	QC Physics
spellingShingle	QC Physics Azni, Siti Radhiana Optimization of hydrogen production by water electrolysis
description	Recently, hydrogen has been considered as a future energy carrier. Hydrogen is believed to be the most important long-term option for addressing the energy, environmental and economic concerns since it is a renewable and clean energy resource. The simplest and cheapest way to produce hydrogen is by electrolysis. However, the process is inefficient. Therefore the objective of this study is to enhance the hydrogen production by optimizing the electrolysis parameters as well as the laser parameters. In this study, fixed volume of distilled water was employed as medium and sodium chloride used as catalyst. Graphite rods were used as electrodes which were supplied by varying voltage. Molybdenum sheets with various surface areas were utilized as a sacrifice agent to protect the cathode. Meanwhile, ethanol solution was used to compensate oxidation by donating an amount of electron in the electrolyte was deployed as supplement. Hence the electrolyte parameters were optimized by varying the voltage, the sacrifice agents and electron donor. In addition, the hydrogen production was also enhanced by illuminating light into the electrolysis chamber. The light source was also optimized by varying the wavelength and the power of the light. In this study, the light source used comprised of diode-pumped solid state laser at various wavelength including, 485 nm, 532 nm, 635 nm, while nitrogen laser and conventional UV light source were at 337 nm and 403 nm respectively. The results obtained showed that the hydrogen increased with the voltage as well as the sacrifice agent area. The larger the voltage, the more the water splitting and the larger the area of sacrifice agent, the more protection on the cathode. Thus, more hydrogen production was encouraged. In contrast, the addition of the supplementary element ethanol was limited to 7 mL and above 7 mL, it resisted the hydrogen production. In the case of illumination light, green laser at 532 nm had shown a pronounced result. This was due to the light that is transparent to the water, thus contributing to more electric field into the electrolysis system. Furthermore, the higher the power of the green laser into the electrolysis chamber the more hydrogen production was realized. Thus, the effectiveness as well as the efficiency of the hydrogen production do relies on the optimizing parameters.
format	Thesis
qualification_level	Master's degree
author	Azni, Siti Radhiana
author_facet	Azni, Siti Radhiana
author_sort	Azni, Siti Radhiana
title	Optimization of hydrogen production by water electrolysis
title_short	Optimization of hydrogen production by water electrolysis
title_full	Optimization of hydrogen production by water electrolysis
title_fullStr	Optimization of hydrogen production by water electrolysis
title_full_unstemmed	Optimization of hydrogen production by water electrolysis
title_sort	optimization of hydrogen production by water electrolysis
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2014
url	http://eprints.utm.my/id/eprint/50789/25/SitiRadhianaAzniMFS2014.pdf
_version_	1747817535155208192

Optimization of hydrogen production by water electrolysis

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