Influences of Bubbles between Electrodes onto Efficiency of Alkaline Water Electrolysis
Influences of Bubbles between Electrodes onto Efficiency of Alkaline Water Electrolysis
复制标题
电极间气泡对碱性水电解效率的影响
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
M. Nakao
中科院分区：
文献类型：
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作者：
N. Nagai;M. Takeuchi;M. Nakao
由于电极间产生气泡的影响，电解水效率存在一个最佳条件。为了解释最优条件的存在，建立了碱性水电解模型。该模型可以表示电极上的空泡率和电流密度分布，并证明了最优条件的存在性。为了验证该模型，测量了KOH溶液在水电解过程中的上升速度、电极间气泡的直径分布和电流密度分布。利用数码显微镜和数码摄像机对电极间的两相流动进行了观察。结果表明，气泡上升速度在4~25 cm/S之间，并随电流密度的增大而增大。气泡直径在0.01~0.5 mm之间，随着电流密度的增大，气泡平均直径变大。结果表明，该模型具有较好的有效性。
There is an optimum condition on water electrolysis efficiency due to the effects of generated bubbles between electrodes. In this paper, in order to explain the existence of the optimum condition, a model of alkaline water electrolysis was established. The model can express void fraction and current density profiles along electrodes, and show the existence of the optimum condition. For verification of this model, rising velocity, diameter distribution of bubbles between electrodes and current density profiles along electrodes were measured during water electrolysis of KOH solution. Two-phase flows between electrodes were observed by digital microscope and digital video camera. The results showed that bubble rising velocity ranges from 4~25 cm/s and becomes larger as current density increases. Bubble diameter ranges from 0.01~0.5 mm, where average diameter becomes large as current density increases. Obtained results showed the sound validity of present model.