本實驗利用多組鎳電極，於氫氧化鉀電解液，進行水電解產氫，由恆電位儀、氣體質量流量計、高速攝影機與相機記錄所得到的數據資料，探討不同電壓值、電極間距與組數、電解液濃度，在加入磁場後，受到磁流體動力學(MHD)中勞侖茲力(Lorentz force)之影響，使電流值提升促進電解，而氣體產量皆會增加，並且使氣泡流場平均分散，降低阻抗促進電解反應。
恆電位儀搭配氣體流量計加入磁場後，在電極間距3mm，濃度25wt%，電壓3V時有最大體積流率為3.6 l/hr。再藉由電化學電解之觀念計算加磁場後產氣增加率、電功率增加率與能量效率，在電極間距3mm，電壓2.5V，單一電極組有最大產氣增加率為13.4%，電功率增加率為10.2%，在多電極組的能量效率皆有不錯的效果，在電極間距3mm，電壓2.5V，1組有最大值為92.14%。
關鍵字: 電解水、勞侖茲力、磁流體動力學(MHD) 、多電極

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

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