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이홍연,황형권,이진구,전유권,박대환,김종학,설용건 한국전기화학회 2016 한국전기화학회지 Vol.19 No.1
Electrospun poly(ether sulfone) (PES) membrane impregnated with Nafion (PES-N) have been developed for high-temperature polymer-electrolyte membrane fuel cell (HTPEMFC). The PES-N obtains highly thermal stability up to 430℃, which is higher than that of the commercial Nafion 212. The PES-N membrane shows a good proton conductivity of about 10-2 S cm-1 in a temperature range from 75℃ to 120℃. The membrane-electrode assembly (MEA) with the PES-N membrane exhibits a current density of 1.697 A cm-2 at 75℃, and 0.813 A cm-2 at 110℃ when the applied voltage is 0.6 V, whereas the MEA with the Nafion 212 membrane shows the current density of 0.647 Acm-2 at 110℃. The results suggest that the PES-N can be a good candidate for a polymer electrolyte membrane of the HT-PEMFC.
Nafion 용액 함침과 전기방사를 이용한 고분자 전해질 연료전지용 폴리에테르술폰 막
이홍연,황형권,박상선,최성원,설용건 한국막학회 2010 멤브레인 Vol.20 No.1
본 연구에서는 내열성 고분자인 폴리에테르술폰을 이용하여 전기방사의 방법으로 섬유 형태의 다공성 막을 제조하였다. 여기에 Nafion 용액을 함침 시켜 고분자 전해질 연료전지용 막을 제조하였다. 열중량 분석을 통해, 현재 고분자 전해질 막으로 상용화되어 널리 쓰이고 있는 Nafion 212보다 더 높은 열적 안정성을 갖는 것을 확인하였다. 주사전자현미경 측정을 통하여, 다공성의 폴리에테르술폰 막에 Nafion 용액이 수소이온 전도체로서 잘 함침 되어 있음을 확인할 수 있었다. AC impedance 측정 결과, 100°C 이하의 온도범위에는 수소 이온 전도도가 10 -2 S/cm로 나왔으며, 100°C 이상의 범위에서는 10 -3 S/cm의 값을 나타냈다. 0.6 V, 90°C의 조건에서 389 mA/㎠의 전류밀도를 나타내었다. Nafion 212 상용 막이 75°C에서 최대 성능을 나타내는데 반해, Nafion 용액을 함침시킨 폴리에테르술폰 막은 90°C에서 최대 성능을 갖는 것으로 나타났다. In this study, we manufactured the membrane using the polyethersulfone (PES) of fiber by using the electrospinning method. The polymer electrolyte membrane for fuel cells was manufactured by impregnating Nafion solution to the porous PES membrane. We confirmed that electrospun PES membrane has higher thermal stability than Nafion 212 membrane by thermogravimetric analysis. Impregnated Nafion in the pores of the electrospun PES membrane was characterized by scanning electron microscopy. The AC impedance data shows the hydrogen ionic conductivity of 10 -2 S/cm below 100°C. Nafion impregnated PES membrane shows the maximum performance at 90°C showing current density of 389 mA/㎠ at 0.6 V, while Nafion 212 membrane shows maximum at 75°C.
전기방사를 이용한 SiO_2/nano ionomer 복합 막의 제조 및 고온 PEMFC에의 응용
나희수,황형권,이찬민,설용건 한국수소및신에너지학회 2011 한국수소 및 신에너지학회논문집 Vol.22 No.5
The SiO_2 membranes for polymer electrolyte membrane fuel cell (PEMFC) are preapared by electrospinning method. It leads to high porosity and surface area of membrane to accommodate the proton conducting materials. The composite membrane was prepared by impregnating of Nafion ionomer into the pores of electrospun SiO_2 membranes. The SiO_2:heteropolyacid (HPA) nano-particles as a inorganic proton conductor were prepared by microemulsion process and the particles are added to the Nafion ionomer. The characterization of the membranes was confirmed by field emission scanning electron microscope (FE-SEM),thermogravimetry analysis (TGA), and single cell performance test for PEMFC. The Nafion impregnated electrospun SiO_2 membrane showed good thermal stability, satisfactory mechanical properties and high proton conductivity. The addition of the SiO_2:HPA nano-particle improved proton conductivity of the composite membrane, which allow further extension for operation temperature in low humidity environments. The composite membrane exhibited a promising properties for the application in high temperature PEMFC.
나희수(Na, Heesoo),황형권(Hwang, Hyungkwon),이찬민(Lee, Chanmin),설용건(Shul, Yonggun) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
There is widespread effort to develop polymer membranes in place of Nafion for high temperature polymer electrolyte membrane fuel cell(PEMFC). In our study, SiO2 membranes are arranged by electrospinning method. For impregnation solution, the modified sulfonated poly(ether ether ketone)(SPEEK) polymer is prepared from sulfonation, sulfochlorination, partial reduction and lithiation reaction. The modified polymer is cross-linked with 1,4-diiodobetane in NMP solvent and then blended with Heteropoly acid(HPA). The characterization of membranes is confimed by FT-IR, Thermogravimetry(TGA), water uptake test and single cell performance test for PEMFC, etc. The composite membrane shows satisfactory thermal and mechanical properties. Beside, The membrane exhibits good ion exchange capacity and high proton conductivity. As a result, The composite membrane is promising as an alternative membrane in high temperature PEMFC.