碩士 / 雲林科技大學 / 環境與安全工程系碩士班 / 96 / Hydrogen as an energy carrier can play an important role in the future. Hydrogen energy has the highest energy content per unit mass and the cleanest as compared to chemical fuel of fuel. This paper studies on water electrolysis for hydrogen production. Water electrolysis is one of the most important processes for hydrogen production today. Gas bubble evolution in water electrolysis is a typical interfacial phenomenon. This is due to high overpotentials at both anode and cathode, which are characteristic for gas evolution processes. That resulting in increasing electric resistance between electrolysis, decreasing the current density and the efficiency of water electrolysis. In order to improve the bubble voltage loss, that can add to agitation in the electrolysis processes. The paper study on the effect of supersonic on the bubble performance of hydrogen by water prodution electrolysis.
In this study, we use the operational parameters of experiments include: electrodes (titanium and the titanium electrodes electroplated with platinum), potassium hydroxide (5 wt.% - 25 wt.%) for water-alkaline electrolyzers, voltage of 1.7 V-3.5 V, power (145 W、195 W、235 W) and frequency (continuous and intermittent type) of supersonic at temperatures of electrolyte 30±2℃ for 1hr on electrolysis. We can find out the better operational parameters for water electrolysis.
The experimental results show the better operational parameters using the titanium electrodes electroplated with platinum, 15wt.% KOH aqueous solutions, voltage of 3.0 V and 5min intermittent type of supersonic at power of 145 W. After operating test, the production of hydrogen is 45.4 cm3/ min and electrolyzer overall volume of gas can up to 11% as compared to not using supersonic processed in electrolysis. Therefore, intermittent type compare continuous type of supersonic to save 60% energy in electrolysis.
According to the data by analysis of variance shows that to improve the bubble resistance between electrolysis and reduce voltage loss, that can add to supersonic in the electrolysis processes. Additionally, MC-3470 (Du Pont) was used as a membrance diaphragm in electrolysis, then the purity of hydrogen has increased from 65±5% to 80% - 90% without further purification.
| Identifer | oai:union.ndltd.org:TW/096YUNT5633014 |
| Date | January 2008 |
| Creators | Wanlon Sung, 宋宛倫 |
| Contributors | Terng-Jou Wan, 萬騰州 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 107 |
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