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- In relation to this article, we declare that there is no conflict of interest.
- Publication history
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Received January 6, 2023
Revised February 27, 2023
Accepted February 28, 2023
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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PEM 수전해에서 정지횟수가 성능 감소에 미치는 영향
Effect of Number of Shutdown on the Decrease of Performance in PEM Water Electrolysis
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Abstract
태양광과 풍력발전의 잉여전기를 공급받아 수전해를 구동하는 경우 날씨 변동에 따라 구동과 정지를 반복해야한다.
수전해를 구동하다 정지하면 잔류 수소와 산소에 의해 PEM 연료전지와 같은 상태가 되고, 구동 중 형성된 수전해의
높은 전위 때문에 전극과 고분자막이 정지 중에도 열화될 가능성이 높다. 본 연구에서는 PEM 수전해가 구동/정지 반
복과정에서 전극과 고분자막의 열화가 얼마나 진행되는지 확인하고자, 144시간 동안에 구동/정지 횟수를 변화시키며
성능 감소를 측정하였다. 전극 촉매 활성면적 변화와 고분자막의 수소투과도와 불소유출속도 등을 분석해 전극과 고
분자막의 특성 변화를 측정했다. 전체적으로 정지 횟수가 증가할수록 PEM 수전해 성능이 감소했다. 144시간동안에 5
회 정지했을 때 IrOx 촉매 활성이 30% 이상 감소하였고, 수소투과도는 80% 증가해서 전극과 고분자막이 모두 열화됨
을 확인했다.
In the case of driving water electrolysis by receiving surplus electricity from solar and wind power generation,
operation and stopping must be repeated according to weather fluctuations. When the PEMWE(Polymer Electrolyte
Membrane Water Electrolysis) is driven and stopped, the PEM fuel cell is in the same state as the PEM fuel cell due to
the residual hydrogen and oxygen, and the high potential of the water electrolysis formed during operation is highly
likely to cause degradation of the electrode and membrane even during stopping. In this study, in order to check how
much degradation of the electrode and membrane progresses during the repeated driving/shutdown process of PEM
water electrolysis, the performance decrease was measured by changing the number of driving/shutdown for 144 hours.
Changes in electrode catalyst active area, hydrogen permeability and fluorine emision rate of membranes were analyzed
to measure changes in the properties of electrodes and polymer membranes. Overall, the PEMWE performance decreased as
the number of stops increased. When stopped 5 times in 144 hours, the IrOx catalyst activity decreased by more than 30%, and
the hydrogen permeability increased by 80%, confirming that both the electrode and the membrane were deteriorated.
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