멤브레인 (Membrane Journal)

  • 제24권5호
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  • Pages.367-374
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  • 2014
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  • 1226-0088(pISSN)
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  • 2288-7253(eISSN)
한국막학회 (The Membrane Society of Korea)
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DOI QR코드

DOI QR Code

LSC/GDC (50 : 50 vol%) 활성층이 LSCF/GDC (20 : 80 vol%) 복합 분리막의 산소투과 거동에 미치는 영향

The Effect of LSC/GDC (50 : 50 vol%) Active Layers on Oxygen Transport Properties of LSCF/GDC (20 : 80 vol%) Dual-phase Membrane

  • 차다솜 (충남대학교 에너지과학기술대학원) ;
  • 유충열 (한국에너지기술연구원 창의소재연구실) ;
  • 주종훈 (한국에너지기술연구원 창의소재연구실) ;
  • 유지행 (한국에너지기술연구원 창의소재연구실) ;
  • 한문희 (충남대학교 에너지과학기술대학원) ;
  • 조철희 (충남대학교 에너지과학기술대학원)
  • Cha, Da-Som (Graduate School of Energy Science and Technology, Chungnam National University) ;
  • Yoo, Chung-Yul (Advanced Materials & Devices Laboratory, Korea Institute of Energy Research) ;
  • Joo, Jong Hoon (Advanced Materials & Devices Laboratory, Korea Institute of Energy Research) ;
  • Yu, Ji Haeng (Advanced Materials & Devices Laboratory, Korea Institute of Energy Research) ;
  • Han, Moon-Hee (Graduate School of Energy Science and Technology, Chungnam National University) ;
  • Cho, Churl-Hee (Graduate School of Energy Science and Technology, Chungnam National University)
  • 투고 : 2014.09.24
  • 심사 : 2014.10.01
  • 발행 : 2014.10.31
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초록

본 연구에서는 LSCF/GDC (20 : 80 vol%) 복합 분리막 표면에 LSC/GDC (50 : 50 vol%) 활성층을 코팅한 후 활성층의 열처리 온도, 두께, 침투법을 이용한 STF 도입이 산소투과 특성에 미치는 영향을 고찰하였다. 활성층 도입은 복합 분리막의 산소 투과 유속을 급격히 증진시켰으며 이는 활성층 성분인 LSC/GDC (50 : 50 vol%)가 전자 전도성 및 표면 산소 분해 반응을 증진시켰기 때문이었다. 활성층의 열처리 온도가 $900^{\circ}C$에서 $1000^{\circ}C$로 증가한 경우, 산소 투과 유속은 증가하였고 이는 분리막과 활성층 사이 그리고 활성층의 결정입간 접촉이 증진하여 산소이온과 전자 흐름을 증진시켰기 때문으로 설명되었다. 코팅층의 두께가 약 $10{\mu}m$에서 약 $20{\mu}m$로 증가한 경우, 산소 투과 유속은 오히려 감소하였는데 이는 코팅층의 두께가 증가할수록 기공을 통한 공기 중의 산소 유입이 어려워지기 때문으로 설명되었다. 또한, 코팅층에 침투법을 이용하여 STF를 도입한 경우가 STF를 도입하지 않은 경우 보다 높은 산소 투과 유속을 보였는데 이는 도입된 STF가 산소 분해하는 표면 반응 속도를 촉진시키기 때문이다. 본 연구로부터 LSC/GDC (50 : 50 vol%) 활성층 코팅 및 특성 제어는 LSCF/GDC (20 : 80 vol%) 복합 분리막의 산소투과 증진에 매우 중요함을 확인하였다.

In the present study, disc-type LSCF/GDC (20 : 80 vol%) dual-phase membranes having porous LSC/GDC (50 : 50 vol%) active layers were prepared and effect of active layers on oxygen ion transport behavior was investigated. Introduction of active layers improved drastically oxygen flux due to enhanced electron conductivity and oxygen surface exchange activity. As firing temperature of active layer increased from $900^{\circ}C$ to $1000^{\circ}C$, oxygen flux increased due to improved contact between membrane and active layer or between grains of active layer. The enhanced contact would improve oxygen ion and electron transports from active layer to membrane. Also, as thickness of active layer increased from 10 to $20{\mu}m$, oxygen flux decreased since thick active layer rather prevented oxygen molecules diffusing through the pores. And, STF infiltration improved oxygen flux due to enhanced oxygen reduction reaction rate. The experimental data announces that coating and property control of active layer is an effective method to improve oxygen flux of dual-phase oxygen transport membrane.

키워드

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