Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Mesoporous SiO2 Mediated Polybenzimidazole Composite Membranes for HT-PEMFC Application

고온 PEMFC 응용을 위한 다공성 SiO2 기반 폴리벤즈이미다졸 복합막

  • HAN, DAEUN (Department of Energy Storage/Conversion Engineering of Graduate School, Hydrogen and Fuel Cell Research Center, Chonbuk National University) ;
  • YOO, DONG JIN (Department of Energy Storage/Conversion Engineering of Graduate School, Hydrogen and Fuel Cell Research Center, Chonbuk National University)
  • 한다은 (전북대학교 대학원 공과대학교 에너지저장.변환공학과 및 수소.연료전지 연구센터) ;
  • 유동진 (전북대학교 대학원 공과대학교 에너지저장.변환공학과 및 수소.연료전지 연구센터)
  • Received : 2019.03.17
  • Accepted : 2019.04.30
  • Published : 2019.04.30
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Abstract

In this study, the mesoporous $SiO_2$ (5, 10, or 15 wt%) was incorporated into the polybenzimidazole matrix in order to improve the proton conduction as well as physiochemical properties of composite membrane. The chemical structure of mesoporous $SiO_2$ and crystallinity of as-prepared membranes were analyzed by Fourier-transform infrared (FT-IR) spectroscopy and X-ray diffraction (XRD) analysis, respectively. The thermal stability of the pristine $X_1Y_9$ and composite membranes were evaluated by thermogravimetric analyzer (TGA). On other side, the physical and chemical properties of the pristine $X_1Y_9$ and composite membranes were also determined by acid uptake and oxidative stability tests, respectively. With the incorporation of 15 wt% $SiO_2$, the composite membrane exhibits the higher proton conductivity that may be applicable for non-humidified high temperature fuel cell applications.

Keywords

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Fig. 2. FT-IR spectroscopy of mesoporous SiO2

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Fig. 3. XRD patterns of the X1Y9 and composite membranes and mesoporous SiO2

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Fig. 4. TGA curves of the X1Y9 and composite membranes

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Fig. 5. Acid uptake of the X1Y9 and composite membranes

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Fig. 6. Oxidative stability of the X1Y9 and composite membranes

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Fig. 7. SEM and mapping images of (a) X1Y9, (b) 10 wt% composite membrane

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Fig. 8. EDAX images of (a) X1Y9, (b) 10 wt% composite membrane

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Fig. 1. The chemical structure of X1Y9

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Fig. 9. Proton conductivity of several membranes

Table 1. Swelling ratio of the X1Y9 and composite membranes.

SSONB2_2019_v30n2_128_t0001.png 이미지

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