The influence of magnetic field on the hydrogen production by multi-electrode water electrolysis

• Main Authors: Chia-hsien Hsu, 許嘉顯
• Other Authors: 洪勵吾
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/09607301817367680939

碩士 === 國立中央大學 === 能源工程研究所 === 103 === Multiple sets of nickel electrode were used in an electrolyte of potassium hydroxide to perform water electrolysis hydrogen production, Effects of different parameters, such as applied voltage, inter-electrode distance, number of electrode groups and concentration of electrolyte on the water electrolysis are investigated by the use of potentiostat, mass flow meter, high-speed camera. By the adding of the magnetic field, the resulting Lorentz force will produce magnetohydrodynamic (MHD) convection and promotes electrolysis with more gas production. Gas bubbles disperse averagely in the electrolyte and the impedance is thus reduced. The maximum flow rate of 3.6 l / hr occurs as inter-electrode distance of 3mm, concentration of 25 wt%, and applied voltage of 3V with the addition of magnetic field. The increase of gas production rate, the increase of electric power rate, and the energy efficiency as the magnetic field is added are also estimated. With the addition of magnetic field, the maximum gas production rate is about 13.4%, electric power rate about 10.2%, and energy efficiency about 92.14%, for the single electrode group under parameters of inter-electrode distance 3mm, and applied voltage 2.5V. For multi-electrode groups, the gas production is increased, and the corresponding energy efficiency is slightly reduced only. It shows that the multi-electrode groups can be applied for the mass production of hydrogen. Key words: Water electrolysis；Lorenz force；Magnetohydrodynamic (MHD)；multi-electrode