sPEEK 막의 수소 투과도는 낮았지만, 저가습 OCV 조건에서 발생하는 라디칼에 Nafion과 같은 불소계 막보다 sPEEK 막이 약했다.
Although the hydrogen permeability of the sPEEK membrane was low, the sPEEK membrane layer was weaker compared to the fluorine-based membrane such as Nafion to radicals generated under low-humidity OCV conditions.