Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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A Study on Effect of the Shape of Electrodes in Alkaline Water Electrolysis

알카리 수전해에서 전극 형상의 영향에 관한 연구

  • CHOI, SOOKWANG (Department of Mechanical Engineering, Graduate School Kumoh National Institute of Technology) ;
  • KIM, JONGSOO (Busan Technical Center of Automotive Parts, Korea Institute of Mechinery & Materials) ;
  • HAN, JIN MOOK (Department of Mechanical Engineering, Graduate School Kumoh National Institute of Technology) ;
  • YUN, SEONG-HO (Department of Mechanical Engineering, Kumoh National Institute of Technology) ;
  • KIM, SEWOONG (Department of Mechanical Engineering, Kumoh National Institute of Technology) ;
  • JUNG, YOUNGUAN (Department of Mechanical Engineering, Kumoh National Institute of Technology)
  • Received : 2017.03.31
  • Accepted : 2017.04.30
  • Published : 2017.04.30
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Abstract

For an investigation on the effect of the shape of electrodes in alkaline water electrolysis, two kinds of stack with circular and square electrode array are used to visualize both for behaviors of hydrogen bubble around the electrodes and for measurements of hydrogen production from these two stacks. The electrolytes for the hydrogen production experiment were applied for 20 wt%, 25 wt%, 30 wt% and 35 wt% of KOH alkaline aqueous solutions. As a result, the adhesion length of bubbles attached around the square electrode in the visualization experiment was found to be 1.7 times longer compared with the attached around the circular electrode. In the hydrogen production experiments, the volume of hydrogen production of the stack by using circular electrode array was approximately 3% more than that of the stack with square electrode array. These observations may be caused by the effect of the bubbles attached to the around the electrodes obstructing mass transfer such as hydrogen exhaust and electrolyte supply.

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References

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