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임민화,박미정,문건오,신동석,김건주,이정명,( Sadhasivam Thangarasu ),정호영 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
The reinforced membranes based on Nafion/sulfonated polyphenylene oxide (sPPO) were prepared for the application of vanadium redox flow battery. In the reinforced membranes, sulfonic acid ionic groups of the membrane have roles of proton conductor, and PPO can be used as a polymer having good mechanical strength. The membranes can obtain their advantages of high proton conductivity as well as good dimensional change. For the successful preparation of reinforced membrane, PPO was sulfonated using chlorosulfonic acid, which increased the hydrophilic sulfonic acid groups. The reinforeced membrane was characterized by water uptake, dimensional change, proton conductivity, ion exchange capacity (IEC) and cell performance of VRFB. Additionally, they were compared with Nafion 212 as a reference membrane in this study.
바나듐 레독스 플로우 베터리용 SSA로 그라프팅된 PVDF (PVDF-g-SSA) 고분자 전해질 막 제조 및 특성연구
임민화,박미정,정호영 한국막학회 2015 한국막학회 총회 및 학술발표회 Vol.2015 No.11
A novel cation exchange membrane consisting of polyvinylidene difluoride (PVDF) was prepared for the application of vanadium redox flow battery (VRFB). PVDF used as supporter has considerably high mechanical strength and an intrinsic hydrophobicity. For the successful preparation of the membrane, PVDF powders were modified by potassium hydroxide, which increased the hydrophilicity of PVDF powders. Modified PVDF were grafted with styrene sulfonic acid (SSA) using benzoyl peroxide (BPO) as initiative. The cross-sectional morphology and structure of PVDF/SSA was confirmed by scanning electron microscopy (SEM) and FT-IR. The membrane was characterized by water uptake, dimensional change, ion conductivity and ion exchange capacity (IEC) and cell performance of Vanadium Redox Flow Battery (VRFB) with Nafion 212.
임민화,박미정,문건오,노현준,( Pham Tan Thong ),( Sadhasivam Thangarasu ),정호영 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Imidazolium-brominated polyphenylene oxide (Im-bPPO) is fabricated on the functionalization of bromomethylated poly(2,6-dimethyl-1,4-phenylene oxide) (BPPO) using 1-Methylimdazole. For the purpose of long cycle life of vanadium redox battery (VRB), the chemical stability of Im-bPPO, sPPO, Nafion and Fumatech membranes were evaluated firstly in the 0.1 M vanadium (V) solution dissolved in 3 M sulfuric acid (H2SO4) for 72 h and UV analyses of the degradation products proved that ether bond in PPO backbone was vulnerable to be attacked by vanadium (V) ion. It was found that the membranes had slightly weight loss after soaking in STS pressure vessel with 2 ml distilled water at 200 °C for 24 h. Further evaluation on the degradation mechanism of the membranes was carried out in fenton`s reagent solution at 50 °C for 72 h. The Fumatech membranes exhibit better performance than AEM and CEM, but Nafion 212 still suffers the chemical degradation.
임민화,박미정,문건오,노현준,( Pham Tan Thong ),( Sadhasivam Thangarasu ),정호영 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
A polyphenylene oxide (PPO)-based anion exchange membrane based on the functionalization of bromomethylated PPO using 1-methylimdazole was fabricated for vanadium redox flow application. The imidazolium- bromomethylated PPO (Im-bPPO) showed lower permeability of VO2+ ions (2.9×10-14 ㎡/sec), compared to Nafion 212 (2.3×10-12 ㎡/sec) and FAP-450 (7.9×10-14 ㎡/sec). Even though the Im-bPPO membrane has higher permeability, the energy efficiency of the VRFB with the Im-bPPO membrane was slightly lower than that of Nafion and FAP-450. The Im-bPPO membrane exhibits good voltage efficiency compared to FAP-450 and Nafion 212 because of its better ion conductivity. The Im-bPPO membrane showed up good performance, but a decline in performance at later cycles was observed.
Chemical degradation of ion exchange membranes for vnanadium redox flow battery (VRFB)
임민화,박미정,문건오,노현준,이정명,( Sadhasivam Thangarasu ),정호영 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Imidazolium-brominated polyphenylene oxide (Im-bPPO) is fabricated on the functionalization of bromomethylated poly(2,6-dimethyl-1,4-phenylene oxide) (BPPO) using 1-Methylimdazole. For the purpose of long cycle life of vanadium redox battery (VRB), the chemical stability of Im-bPPO, sPPO, Nafion and Fumatech membranes were evaluated firstly in the 0.1 M vanadium (V) solution dissolved in 3 M sulfuric acid (H2SO4) for 72 h and UV analyses of the degradation products proved that ether bond in PPO backbone was vulnerable to be attacked by vanadium (V) ion. It was found that the membranes had slightly weight loss after soaking in STS pressure vessel with 2 ml distilled water at 200 ℃ for 24 h. Further evaluation on the degradation mechanism of the menbranes was carried out in fenton`s reagent solution at 50 ℃ for 72 h. The Fumatech membranes exhibit better performance than AEM and CEM, but Nafion 212 still suffers the chemical degradation.
임민화,문건오,박미정,노현준,이정명,( Sadhasivam Thangarasu ),정호영 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
A polyphenylene oxide (PPO)-based anion exchange membrane based on the functionalization of bromomethylated PPO using 1-methylimdazole was fabricated for vanadium redox flow application. The imidazolium-bromomethylated PPO (Im-bPPO) showed lower permeability VO(2+) ions (2.9×10(-14) ㎡/sec), compared to Nafion 212 (2.3×10(-12) ㎡/sec) and FAP-450 (7.9×10(-14) ㎡/sec). Even though the Im-bPPO membrane has higher permeability, the energy efficiency of the VRFB with the Im-bPPO membrane was slightly lower than that of Nafion and FAP-450. The Im-bPPO membrane exhibits good voltage efficiency compared to FAP-450 and Nafion 212 because of its better ion conductivity. The Im-bPPo membrane showed up good performance, but a decline in performance at later cycles was observed.
The reinforced composite membranes based on Nafion/porous polyvinylidene difluoride (PVdF) membranes
임민화,문건오,신동석,정호영 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
The reinforced composite membranes based on Nafion/porous polyvinylidene difluoride (PVdF) were produced for the application of energy storage systems. In the reinforced composite membranes, Nafion plays the role of proton conductor, and porous PVdF can be used as a supporter that has a strong mechanical stability. For the successful preparation of reinforced membranes, porous PVdF film was modified by potassium hydroxide, which increased the hydrophilicity of porous PVDF film. Enhanced hydrophilicity of PVdF film led to high absorption of Nafion ionomer and high compatibility between Nafion and porous PVdF film. The produced membranes were characterized by dimensional change, water uptake, ion exchange capacity (IEC), and proton conductivity. Furthermore, The reinforced membranes were characterized by FT-IR, HNMR, and SEM.
임민화,신동석,문건오,정호영 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Hydrophilic poly(vinylidene difluoride) membranes were prepared using chemical modification and sulfonation. Chemical reagents were used to modify PVDF films and improve the hydrophilicity and it was presented by optimization and characterization of the prepared membranes. Degree of defluorination were controlled by varying the potassium hydroxide concentration. Furthermore, The sulfonation of PVDF and degree of performance were presented by using sulfonic acid. The effects of surface modification was analyzed by FT-IR, HNMR and SEM. The general properties of hydrophilic membranes was compared by ion exchange capacity (IEC), water content and ion conductivity.
조나래,임민화,손준연,노선균,정호영,손정선 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
과불화화합물(Perfluorinated compounds, PFCs) 가스 분해 기술에 대한 연구 개발은 국내외적으로 활발히 진행되어 오고 있고, 그 중 PFCs 분해 시 부산물 중 하나인 불화수소(HF)를 제거하는 물질로서 산화칼슘(CaO)은 고형 흡착제 제조 시 가장 많이 이용되는 물질 중 하나로 알려져 있다. CaO는 HF와의 반응을 통하여 HF 제거 및 재활용이 가능한 불산 제조 원천물질인 불화칼슘(CaF2)의 자원회수도 가능하다. 그러나 CaO는 수증기에 대한 폭발적인 반응성을 가지고 있어 HF 제거용으로 CaO계 고형환원제를 도입할 시 그들의 효율을 감소시키게 된다. 이러한 문제점을 해결하기 위해 본 연구에서는 소수성 지지체를 도입하여 수화안정성을 향상시키고 바인더를 함께 혼합하여 성형함으로써 입자형태의 고형 환원제를 만들고자 하였다. 즉, HF 제거용 고효율 고형환원제 제조를 위하여 지지체로서 소수성 실리카를 사용하여 CaO/SiO2 혼합물을 제조한 후, 바인더를 도입하여 고형환원제를 제조하였고, 그들의 특성을 조사하였다.