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멤브레인 = Membrane Journal, v.30 no.2, 2020년, pp.79 - 96
김재훈 (광주과학기술원 지구환경공학부) , 류승보 (광주과학기술원 지구환경공학부) , 문승현 (광주과학기술원 지구환경공학부)
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Secondary energy conversion systems have been briskly developed owing to environmental issue and problems of fossil fuel. They are basically operated based on electro-chemical systems. In addition, ion exchange membranes are one of the significant factors to determine performance in their systems. T...
| 핵심어 | 질문 | 논문에서 추출한 답변 |
|---|---|---|
| 역전기투석은 어떠한 방식인가? | 역전기투석에서는 양이온교환막과 음이온교환막이 교차적으로 사용되고 대량의 발전 시설을 위해서는 양이온교환막과 음이온교환막이 순차 적으로 적층되는 구조이다[1]. 역전기투석은 바닷물과 강물의 염분차를 이용하여 양이온 혹은 음이온만을 선별적으로 투과하는 것으로 Na + 이온과 Cl - 이온이 전하 이동물질이 되어 전기 에너지를 형성하는 방식이다. 연료 전지와 비교하면 염분에 포함된 Na + 이온과 Cl - 이온의 크기가 수소이온에 비해 분자량이 크고 이온 이동 속도 (ion mobility)가 현저히 떨어지기 때문에 여전히 성능 향상을 위한 저저항 막이 필요하다. | |
| 레독스 흐름 전지에서는 무엇에 따라 이온교환막에 필요한 특성이 달라지는가? | 대규모 에너지 저장을 목적으로 하는 이차전지에 이온교환막이 사용되는데, 대표적으로는 레독스 흐름 전지가 있다. 레독스 흐름 전지에서는 산화환원 물질과 전해질의 수계 여부에 따라 이온교환막에 필요한 특성이 달라진다. 그러나 근본적으로 레독스 흐름 전지 역시 이온교환막을 사용하는 연료전지, 역전기 투석과 마찬가지로 전하전달물질(charge carrier)에 해당하는 특정 이온을 투과시키는 것은 동일 하다. | |
| 연료전지(fuel cell), 역전기 투석(RED, reverse electrodialysis), 레독스 흐름 전지(RFB, redox flow battery) 등 새로운 전기화학 시스템에 공통적으로 내포되어 있는 물질은 무엇인가? | 연료전지(fuel cell), 역전기 투석(RED, reverse electrodialysis), 레독스 흐름 전지(RFB, redox flow battery) 등 새로운 전기화학 시스템이 그 예가 될 수 있다. 이러한 전기화학적 시스템에는 공통적으로 이온교환막으로 불리는 고분자 필름이 내포되어 있고 이들 시스템의 성능이나 효율을 결정짓는 중요한 요소 중 하나이다. 이러한 이온교환막은 공통적으로 주사슬과 함께 곁사슬 혹은 주사슬에 전하를 띈 작용기가 부착되어 있다. |
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