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가교도가 조절된 세공충진 이온교환막의 제조 및 전기화학적 응용: Part II. 역 전기투석
송현비,문하늘,김도형,강문성 한국막학회 2017 멤브레인 Vol.27 No.5
본 연구에서는 다공성 폴리에틸렌 지지체를 기반으로 세 가지 가교제를 혼합 도입한 세공충진 이온교환막을 제조 하고 역 전기투석에서 멤브레인의 특성이 발전성능에 미치는 영향을 고찰하였다. 실험 결과, 분자 크기가 다른 가교제를 혼합 함으로써 이온교환막의 가교도 및 자유체적이 효과적으로 조절됨을 확인하였으며 상관 분석을 통해 멤브레인의 전기화학적 특성 및 이를 적용한 역 전기투석의 발전성능에 복합적인 영향을 미침을 알 수 있었다. 특히 세공충진 양이온 교환막은 최적 가교조건에서 상용막 대비 동등 이상의 발전 성능을 나타내었으며 음이온 교환막 또한 상용막에 근접하는 우수한 성능을 나 타내었다. In this study, the effects of membrane characteristics on the power generation performance in reverse electrodialysis (RED) have been investigated with pore-filled ion-exchange membranes (PFIEMs) prepared by employing a porous polyethylene substrate and the mixtures of three cross-linking agents. As a result, it was confirmed through the correlation analyses that the cross-linking degree and free volume of the PFIEMs were effectively controlled by mixing the cross-linking agents having different molecular sizes, influencing complexly the electrochemical characteristics of the membranes and the power generation performance in RED. In particular, the pore-filled cation-exchange membranes at the optimum cross-linking conditions exhibited the power generation performance superior to that of the commercial membranes and the pore-filled anion-exchange membranes also showed the excellent performance close to that of the commercial membrane.
Bipolar membranes containing efficient and durable water splitting catalysts
송현비,문하늘,강문성 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
In this study, we have developed a novel type of bipolar membranes (BPMs) for efficient water-splitting processes. BPMs were prepared via a pore-filling method and shown to possess excellent water-splitting efficiency and mechanical properties. In addition, efficient and durable metal complexes were examined as the catalysts for facilitating water-splitting in BPMs. Membrane characterizations and water-splitting experiments were also conducted to determine the optimum metal catalyst and loading amount. Consequently, it was confirmed that the BPM prepared under the optimum condition showed excellent stability as well as a better water-splitting flux than that of the commercial BPM. The detailed results will be presented at the conference. This work was supported by the National Research Foundation of Korea(NRF) grant funded by the Korea government(MSIT) (No. 2019R1A2C1089286).
효율적인 전기화학적 LiOH 생산을 위한 상용 바이폴라막 특성 분석
송현비,강문성,Song, Hyeon-Bee,Kang, Moon-Sung 한국막학회 2022 멤브레인 Vol.32 No.5
최근 전기자동차용 이차전지 등의 수요가 급증하면서 효율적인 리튬 화합물의 생산이 큰 주목을 받고 있다. 바이폴라막 전기투석은 친환경적이며 경제성 및 효율성이 우수한 전기화학적 리튬 화합물 생산공정으로 알려져 있다. 바이폴라막 전기투석 공정의 효율은 바이폴라막의 성능에 의해 좌우되기 때문에 바이폴라막의 선택이 매우 중요하다. 본 연구에서는 세계적으로 가장 널리 사용되고 있는 대표적인 상용 BPM인 Astom사의 BP-1E 및 Fumatech사의 FBM을 비교 분석함으로써 전기화학적 LiOH 생산을 위한 BPED 공정에 적합한 BPM의 특성을 도출하고자 하였다. 체계적인 평가를 통해 BPM의 특성중 막의 이온전달저항 및 co-ion leakage를 줄이는 것이 가장 중요하고 이러한 관점에서 BP-1E가 FBM보다 더 우수한 성능을 가지고 있음을 확인하였다.
김도형,송현비,윤경석,강문성,Kim, Do-Hyeong,Song, Hyeon-Bee,Yoon, Kyungseok,Kang, Moon-Sung 한국막학회 2022 멤브레인 Vol.32 No.5
Reverse electrodialysis (RED) is one of the promising eco-friendly renewable energy technologies which can generate electricity from the concentration difference between seawater and freshwater by using ion-exchange membranes as a diaphragm. The ion-exchange membrane is a key component that determines the performance of RED, and must satisfy requirements such as low electrical resistance, high permselectivity, excellent durability, and low manufacturing cost. In this study, pore-filled anion-exchange membranes were fabricated using porous polymer substrates having various thicknesses and porosity, and the effects of ion-exchange polymer composition and membrane thickness on the power generation performance of RED were investigated. When the electrical resistance of the ion-exchange membrane is sufficiently low, it can be confirmed that the RED power generation performance is mainly influenced by the apparent permselectivity of the membrane. In addition, it was confirmed that the apparent permselectivity of the membranes can be improved through IEC, crosslinking degree, membrane thickness, surface modification, etc., and the optimum condition must be found in consideration of the trade-off relationship with electrical resistance.
Facile surface modification of ion-exchange membranes for efficient electro-membrane processes
문하늘,송현비,강문성 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
In this work, we have investigated the facile surface modification of ion-exchange membranes (IEMs) for successful application to promising electro-membrane processes. Simple surface modifications were conducted with various organic/inorganic composites, such as polypyrrole and reduced graphene. The results revealed that the membrane surface properties are effectively controlled by introducing the surface layer and can determine the selective transport of specific ion species. The surface-modified IEMs have also been applied to several electro-membrane processes, such as water-splitting electro-dialysis and all-vanadium redox flow battery. The detailed results will be presented at the conference.